Ubuntu 11.04 USN-1134-1 Moderate: Apache Denial of Service Risk

ubuntu

May 24, 2011

A denial of service issue exists that affects the Apache web server.

Summary

A denial of service issue exists that affects the Apache web server.

Software Description:

- apr: The Apache Portable Runtime Library

- apache2: a scalable, extensible web server

Details:

Maksymilian Arciemowicz reported that a flaw in the fnmatch()

implementation in the Apache Portable Runtime (APR) library could allow

an attacker to cause a denial of service. This can be demonstrated

in a remote denial of service attack against mod_autoindex in the

Apache web server. (CVE-2011-0419)

Is was discovered that the fix for CVE-2011-0419 introduced a different

flaw in the fnmatch() implementation that could also result in a

denial of service. (CVE-2011-1928)

Topics Covered

security advisory denial of service software update apache Ubuntu risk APR

Update Instructions

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

Ubuntu 11.04:
  libapr1                         1.4.2-7ubuntu2.1

Ubuntu 10.10:
  libapr1                         1.4.2-3ubuntu1.1

Ubuntu 10.04 LTS:
  libapr1                         1.3.8-1ubuntu0.3

Ubuntu 8.04 LTS:
  libapr1                         1.2.11-1ubuntu0.2

Ubuntu 6.06 LTS:
  libapr0                         2.0.55-4ubuntu2.13

After a standard system update you need to restart the Apache web
server or any other service that depends on the APR library to make
all the necessary changes.