Ubuntu 1358-2: PHP regression

    Date13 Feb 2012
    Posted ByLinuxSecurity Advisories
    USN 1358-1 introduced a regression in PHP.
    Ubuntu Security Notice USN-1358-2
    February 13, 2012
    php5 regression
    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
    USN 1358-1 introduced a regression in PHP.
    Software Description:
    - php5: HTML-embedded scripting language interpreter
    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
     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:
    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.
    Package Information:
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