Apache: Multiple vulnerabilities — GLSA 200907-04

Multiple vulnerabilities in the Apache HTTP daemon allow for local privilege escalation, information disclosure or Denial of Service attacks.

Affected Packages

www-servers/apache on all architectures
Affected versions < 2.2.11-r2
Unaffected versions >= 2.2.11-r2

Background

The Apache HTTP server is one of the most popular web servers on the Internet.

Description

Multiple vulnerabilities have been discovered in the Apache HTTP server:

  • Jonathan Peatfield reported that the "Options=IncludesNoEXEC" argument to the "AllowOverride" directive is not processed properly (CVE-2009-1195).
  • Sander de Boer discovered that the AJP proxy module (mod_proxy_ajp) does not correctly handle POST requests that do not contain a request body (CVE-2009-1191).
  • The vendor reported that the HTTP proxy module (mod_proxy_http), when being used as a reverse proxy, does not properly handle requests containing more data as stated in the "Content-Length" header (CVE-2009-1890).
  • Francois Guerraz discovered that mod_deflate does not abort the compression of large files even when the requesting connection is closed prematurely (CVE-2009-1891).

Impact

A local attacker could circumvent restrictions put up by the server administrator and execute arbitrary commands with the privileges of the user running the Apache server. A remote attacker could send multiple requests to a server with the AJP proxy module, possibly resulting in the disclosure of a request intended for another client, or cause a Denial of Service by sending specially crafted requests to servers running mod_proxy_http or mod_deflate.

Workaround

Remove "include", "proxy_ajp", "proxy_http" and "deflate" from APACHE2_MODULES in make.conf and rebuild Apache, or disable the aforementioned modules in the Apache configuration.

Resolution

All Apache users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=www-servers/apache-2.2.11-r2"

References

Release Date
July 12, 2009

Latest Revision
July 12, 2009: 01

Severity
high

Exploitable
local, remote

Bugzilla entries