USN-802-2: Apache regression

Releases

• Ubuntu 9.04
• Ubuntu 8.10
• Ubuntu 8.04
• Ubuntu 6.06

Packages

• apache2 -

Details

USN-802-1 fixed vulnerabilities in Apache. The upstream fix for
CVE-2009-1891 introduced a regression that would cause Apache children to
occasionally segfault when mod_deflate is used. This update fixes the
problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that mod_proxy_http did not properly handle a large
amount of streamed data when used as a reverse proxy. A remote attacker
could exploit this and cause a denial of service via memory resource
consumption. This issue affected Ubuntu 8.04 LTS, 8.10 and 9.04.
(CVE-2009-1890)

It was discovered that mod_deflate did not abort compressing large files
when the connection was closed. A remote attacker could exploit this and
cause a denial of service via CPU resource consumption. (CVE-2009-1891)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 9.04

• apache2-mpm-worker - 2.2.11-2ubuntu2.3
• apache2-mpm-event - 2.2.11-2ubuntu2.3
• apache2.2-common - 2.2.11-2ubuntu2.3
• apache2-mpm-prefork - 2.2.11-2ubuntu2.3

Ubuntu 8.10

• apache2-mpm-worker - 2.2.9-7ubuntu3.3
• apache2-mpm-event - 2.2.9-7ubuntu3.3
• apache2.2-common - 2.2.9-7ubuntu3.3
• apache2-mpm-prefork - 2.2.9-7ubuntu3.3

Ubuntu 8.04

• apache2-mpm-worker - 2.2.8-1ubuntu0.11
• apache2-mpm-event - 2.2.8-1ubuntu0.11
• apache2.2-common - 2.2.8-1ubuntu0.11
• apache2-mpm-prefork - 2.2.8-1ubuntu0.11
• apache2-mpm-perchild - 2.2.8-1ubuntu0.11

Ubuntu 6.06

• apache2-mpm-worker - 2.0.55-4ubuntu2.8
• apache2-mpm-perchild - 2.0.55-4ubuntu2.8
• libapr0 - 2.0.55-4ubuntu2.8
• apache2-mpm-prefork - 2.0.55-4ubuntu2.8
• apache2-common - 2.0.55-4ubuntu2.8

In general, a standard system upgrade is sufficient to effect the
necessary changes.

References

• https://launchpad.net/bugs/409987