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Apache: Multiple vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200907-04 / apache
Release Date July 12, 2009
Latest Revision July 12, 2009: 01
Impact high
Exploitable local, remote
Package Vulnerable versions Unaffected versions Architecture(s)
www-servers/apache < 2.2.11-r2 >= 2.2.11-r2 All supported architectures

Related bugreports: #268154, #271470, #276426, #276792


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

2.  Impact Information


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


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).


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.

3.  Resolution Information


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.


All Apache users should upgrade to the latest version:

Code Listing 3.1: Resolution

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

4.  References


Page updated July 12, 2009

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