From: Alex Legler (a3ligentoo.org)
Date: Fri Sep 18 2009 - 14:45:41 CDT

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Gentoo Linux Security Advisory GLSA 200909-18
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                                            http://security.gentoo.org/
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  Severity: High
     Title: nginx: Remote execution of arbitrary code
      Date: September 18, 2009
      Bugs: #285162
        ID: 200909-18

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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.

Background
==========

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

Affected packages
=================

    -------------------------------------------------------------------
     Package / Vulnerable / Unaffected
    -------------------------------------------------------------------
  1 www-servers/nginx < 0.7.62 *>= 0.5.38
                                                            *>= 0.6.39
>= 0.7.62

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.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

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

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

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

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

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

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

References
==========

  [ 1 ] CVE-2009-2629
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2629

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200909-18.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
securitygentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2009 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5

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