SB2013072002 - Stack-based buffer overflow in nginx

Description

This security bulletin contains information about 1 security vulnerability.

1) Stack-based buffer overflow (CVE-ID: CVE-2013-2028)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the ngx_http_parse_chunked function in http/ngx_http_parse.c when processing a chunked Transfer-Encoding request with a large chunk size, which triggers an integer signedness error and a stack-based buffer overflow. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install update from vendor's website.

References

• http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105176.html
• http://mailman.nginx.org/pipermail/nginx-announce/2013/000112.html
• http://nginx.org/download/patch.2013.chunked.txt
• http://packetstormsecurity.com/files/121675/Nginx-1.3.9-1.4.0-Denial-Of-Service.html
• http://secunia.com/advisories/55181
• http://security.gentoo.org/glsa/glsa-201310-04.xml
• http://www.osvdb.org/93037
• http://www.securityfocus.com/bid/59699
• http://www.vnsecurity.net/2013/05/analysis-of-nginx-cve-2013-2028/
• https://github.com/rapid7/metasploit-framework/pull/1834