nginx: Remote execution of arbitrary code

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200909-18 / nginx
Release Date	September 18, 2009
Latest Revision	September 18, 2009: 01
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
www-servers/nginx	< 0.7.62	revision >= 0.5.38, revision >= 0.6.39, >= 0.7.62	All supported architectures

Related bugreports: #285162

Synopsis

A buffer underflow vulnerability in the request URI processing of nginx might enable remote attackers to execute arbitrary code or cause a Denial of Service.

2. Impact Information

Background

nginx is a robust, small and high performance HTTP and reverse proxy server.

Description

Chris Ries reported a heap-based buffer underflow in the ngx_http_parse_complex_uri() function in http/ngx_http_parse.c when parsing the request URI.

Impact

A remote attacker might send a specially crafted request URI to a nginx server, possibly resulting in the remote execution of arbitrary code with the privileges of the user running the server, or a Denial of Service. NOTE: By default, nginx runs as the "nginx" user.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All nginx 0.5.x users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=www-servers/nginx-0.5.38"

All nginx 0.6.x users should upgrade to the latest version:

Code Listing 3.2: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=www-servers/nginx-0.6.39"

All nginx 0.7.x users should upgrade to the latest version:

Code Listing 3.3: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=www-servers/nginx-0.7.62"

4. References

CVE-2009-2629

Page updated September 18, 2009

Summary: This is a Gentoo Linux Security Advisory

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