Ubuntu Security Notice USN-1368-1
16th February, 2012
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS
Several security issues were fixed in the Apache HTTP Server.
- apache2 - Apache HTTP server
It was discovered that the Apache HTTP Server incorrectly handled the
SetEnvIf .htaccess file directive. An attacker having write access to a
.htaccess file may exploit this to possibly execute arbitrary code.
Prutha Parikh discovered that the mod_proxy module did not properly
interact with the RewriteRule and ProxyPassMatch pattern matches in the
configuration of a reverse proxy. This could allow remote attackers to
contact internal webservers behind the proxy that were not intended for
external exposure. (CVE-2011-4317)
Rainer Canavan discovered that the mod_log_config module incorrectly
handled a certain format string when used with a threaded MPM. A remote
attacker could exploit this to cause a denial of service via a specially-
crafted cookie. This issue only affected Ubuntu 11.04 and 11.10.
It was discovered that the Apache HTTP Server incorrectly handled certain
type fields within a scoreboard shared memory segment. A local attacker
could exploit this to to cause a denial of service. (CVE-2012-0031)
Norman Hippert discovered that the Apache HTTP Server incorrecly handled
header information when returning a Bad Request (400) error page. A remote
attacker could exploit this to obtain the values of certain HTTPOnly
The problem can be corrected by updating your system to the following package version:
- Ubuntu 11.10:
- apache2.2-common 2.2.20-1ubuntu1.2
- Ubuntu 11.04:
- apache2.2-common 2.2.17-1ubuntu1.5
- Ubuntu 10.10:
- apache2.2-common 2.2.16-1ubuntu3.5
- Ubuntu 10.04 LTS:
- apache2.2-common 2.2.14-5ubuntu8.8
- Ubuntu 8.04 LTS:
- apache2.2-common 2.2.8-1ubuntu0.23
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.