1. Ubuntu Security Notices
  2. USN-1358-1

USN-1358-1: PHP vulnerabilities

Publication date

10 February 2012

Overview

Multiple vulnerabilities in PHP.

Releases

Packages

  • php5 - HTML-embedded scripting language interpreter

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
http://www.php.net/manual/en/info.configuration.php#ini.max-input-vars
for more information.

Stefan Esser discovered that the fix to address the predictable hash
collision issue, CVE-2011-4885, did not properly handle the situation
where the limit was reached. This could allow a remote attacker to
cause...

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
http://www.php.net/manual/en/info.configuration.php#ini.max-input-vars
for more information.

Stefan Esser discovered that the fix to address the predictable hash
collision issue, CVE-2011-4885, did not properly handle the situation
where the limit was reached. This could allow a remote attacker to
cause a denial of service or execute arbitrary code via a request
containing a large number of variables. (CVE-2012-0830)

It was discovered that PHP did not always check the return value of
the zend_strndup function. This could allow a remote attacker to
cause a denial of service. (CVE-2011-4153)

It was discovered that PHP did not properly enforce libxslt security
settings. This could allow a remote attacker to create arbitrary
files via a crafted XSLT stylesheet that uses the libxslt output
extension. (CVE-2012-0057)

It was discovered that PHP did not properly enforce that PDORow
objects could not be serialized and not be saved in a session. A
remote attacker could use this to cause a denial of service via an
application crash. (CVE-2012-0788)

It was discovered that PHP allowed the magic_quotes_gpc setting to
be disabled remotely. This could allow a remote attacker to bypass
restrictions that could prevent an SQL injection. (CVE-2012-0831)

USN 1126-1 addressed an issue where the /etc/cron.d/php5 cron job
for PHP allowed local users to delete arbitrary files via a symlink
attack on a directory under /var/lib/php5/. Emese Revfy discovered
that the fix had not been applied to PHP for Ubuntu 10.04 LTS. This
update corrects the issue. We apologize for the error. (CVE-2011-0441)

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
8.04 hardy php5-cli –  5.2.4-2ubuntu5.22
php5-cgi –  5.2.4-2ubuntu5.22
php5-common –  5.2.4-2ubuntu5.22
php5-xsl –  5.2.4-2ubuntu5.22
php5 –  5.2.4-2ubuntu5.22
libapache2-mod-php5 –  5.2.4-2ubuntu5.22
11.10 oneiric php5-cli –  5.3.6-13ubuntu3.5
php5-cgi –  5.3.6-13ubuntu3.5
php5-common –  5.3.6-13ubuntu3.5
php5-xsl –  5.3.6-13ubuntu3.5
php5 –  5.3.6-13ubuntu3.5
libapache2-mod-php5 –  5.3.6-13ubuntu3.5
11.04 natty php5-cli –  5.3.5-1ubuntu7.6
php5-cgi –  5.3.5-1ubuntu7.6
php5-common –  5.3.5-1ubuntu7.6
php5-xsl –  5.3.5-1ubuntu7.6
php5 –  5.3.5-1ubuntu7.6
libapache2-mod-php5 –  5.3.5-1ubuntu7.6
10.10 maverick php5-cli –  5.3.3-1ubuntu9.9
php5-cgi –  5.3.3-1ubuntu9.9
php5-common –  5.3.3-1ubuntu9.9
php5-xsl –  5.3.3-1ubuntu9.9
php5 –  5.3.3-1ubuntu9.9
libapache2-mod-php5 –  5.3.3-1ubuntu9.9
10.04 lucid php5-cli –  5.3.2-1ubuntu4.13
php5-cgi –  5.3.2-1ubuntu4.13
php5-common –  5.3.2-1ubuntu4.13
php5-xsl –  5.3.2-1ubuntu4.13
php5 –  5.3.2-1ubuntu4.13
libapache2-mod-php5 –  5.3.2-1ubuntu4.13

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References

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