Nginx %00空字节执行任意代码(php)漏洞

攻城狮

影响版本:
nginx 0.5.*
nginx 0.6.*
nginx 0.7 <= 0.7.65
nginx 0.8 <= 0.8.37

漏洞描述:
Possible Arbitrary Code Execution with Null Bytes, PHP, and Old Versions of nginx

Ngnix在遇到%00空字节时与后端FastCGI处理不一致，导致可以在图片中嵌入PHP代码然后通过访问xxx.jpg%00.php来执行其中的代码

In vulnerable versions of nginx, null bytes are allowed in URIs by default (their presence is indicated via a variable named zero_in_uri defined in ngx_http_request.h).

Individual modules have the ability to opt-out of handling URIs with null bytes. However, not all of them do; in particular, the FastCGI module does not.
<*参考
https://nealpoole.com/blog/2011/ ... -versions-of-nginx/
*>

测试方法:
[sebug.net]
本站提供程序(方法)可能带有攻击性,仅供安全研究与教学之用,风险自负!
The attack itself is simple: a malicious user who makes a request to http://example.com/file.ext%00.php causes file.ext to be parsed as PHP.

If an attacker can control the contents of a file served up by nginx (ie: using an avatar upload form) the result is arbitrary code execution. This vulnerability can not be mitigated by nginx configuration settings like try_files or PHP configuration settings like cgi.fix_pathinfo: the only defense is to upgrade to a newer version of nginx or to explicitly block potentially malicious requests to directories containing user-controlled content.

SEBUG安全建议:

解决方案
升级nginx版本
http://nginx.org

nbclare

哈哈大侠

这个字节？这个不是win系统下的漏洞么

金关村村长

不是發過 了嗎？

lemss

之前就有了

czc111222

关注

dotswing

最新版路过

小夜

我今天部署了几个，升到1.1.1了，LNMP有一键脚本，还是很方便的。

咖啡

新版路过。。。