Ubuntu 11.10 USN-1358-2 Critical: PHP Denial of Service Fix

ubuntu

February 13, 2012

USN 1358-1 introduced a regression in PHP.

Summary

USN 1358-1 introduced a regression in PHP.

Software Description:

- php5: HTML-embedded scripting language interpreter

Details:

USN 1358-1 fixed multiple vulnerabilities in PHP. The fix for

CVE-2012-0831 introduced a regression where the state of the

magic_quotes_gpc setting was not correctly reflected when calling

the ini_get() function.

We apologize for the inconvenience.

Original advisory details:

It was discovered that PHP computed hash values for form parameters

without restricting the ability to trigger hash collisions predictably.

This could allow a remote attacker to cause a denial of service by

sending many crafted parameters. (CVE-2011-4885)

ATTENTION: this update changes previous PHP behavior by

limiting the number of external input variables to 1000.

This may be increased by adding a "max_input_vars"

directive to the php.ini configuration file. See

https://www.php.net/manual/en/info.configuration.php

for more information.

...

Read the Full Advisory

Topics Covered

security advisory denial of service software update security fix ubuntu regression php5

Update Instructions

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

Ubuntu 11.10:
  libapache2-mod-php5             5.3.6-13ubuntu3.6
  php5                            5.3.6-13ubuntu3.6
  php5-cgi                        5.3.6-13ubuntu3.6
  php5-cli                        5.3.6-13ubuntu3.6

Ubuntu 11.04:
  libapache2-mod-php5             5.3.5-1ubuntu7.7
  php5                            5.3.5-1ubuntu7.7
  php5-cgi                        5.3.5-1ubuntu7.7
  php5-cli                        5.3.5-1ubuntu7.7

Ubuntu 10.10:
  libapache2-mod-php5             5.3.3-1ubuntu9.10
  php5                            5.3.3-1ubuntu9.10
  php5-cgi                        5.3.3-1ubuntu9.10
  php5-cli                        5.3.3-1ubuntu9.10

Ubuntu 10.04 LTS:
  libapache2-mod-php5             5.3.2-1ubuntu4.14
  php5                            5.3.2-1ubuntu4.14
  php5-cgi                        5.3.2-1ubuntu4.14
  php5-cli                        5.3.2-1ubuntu4.14

Ubuntu 8.04 LTS:
  libapache2-mod-php5             5.2.4-2ubuntu5.23
  php5                            5.2.4-2ubuntu5.23
  php5-cgi                        5.2.4-2ubuntu5.23
  php5-cli                        5.2.4-2ubuntu5.23

In general, a standard system update will make all the necessary changes.