nginx Integer Overflow

[Nytro]

nginx Integer Overflow

Authored by Safe3 | Site safe3.com.cn

Qihoo 360 Web Security Research Team discovered a critical vulnerability in nginx. The vulnerability is caused by a integer overflow error within the Nginx ngx_http_close_connection function when r->count is less then 0 or more then 255, which could be exploited by remote attackers to compromise a vulnerable system via malicious http requests.

Website: http://safe3.com.cn

I. BACKGROUND
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Nginx is an HTTP and reverse proxy server, as well as a mail proxy server, written by Igor Sysoev. For a long time, it has been running on many heavily loaded Russian sites including Yandex, Mail.Ru, VKontakte, and Rambler. According to Netcraft nginx served or proxied 12.96% busiest sites in April 2013. Here are some of the success stories: Netflix, Wordpress.com, FastMail.FM.

II. DESCRIPTION
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Qihoo 360 Web Security Research Team discovered a critical vulnerability in nginx.

The vulnerability is caused by a int overflow error within the Nginx
ngx_http_close_connection function  when r->count is less then 0 or more then 255, which could be exploited
by remote attackers to compromise a vulnerable system via malicious http requests.

III. AFFECTED PRODUCTS
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Nginx all latest version

IV. Exploits/PoCs
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In-depth technical analysis of the vulnerability and a fully functional remote code execution exploit are available through the safe3q@gmail.com
In src\http\ngx_http_request_body.c ngx_http_discard_request_body function,we can make r->count++.

V. VUPEN Threat Protection Program
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VI. SOLUTION
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Validate the r->count input.

VII. CREDIT
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This vulnerability was discovered by Safe3 of Qihoo 360.

VIII. ABOUT Qihoo 360
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Qihoo 360 is the leading provider of defensive and offensive web cloud security of China.


IX. REFERENCES
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http://nginx.org/en/

Sursa: nginx Integer Overflow ? Packet Storm