CVE-2011-3379: Code Injection
First published: Sat Sep 24 2011(Updated: )
It was reported [1],[2] that due to changes in the is_a() function [3],[4] PHP 5.3.7 and 5.3.8 became vulnerable to remote arbitrary code execution when is_a() is used in certain ways. Due to the __autoload() implementation, if a user were able to upload a crafted file, it could be possible to pass the contents of the file as an argument to the __autoload() function which could in turn use that argument as a file to include(). If there was no adequate checking or enforcement of the file to load being, local, this could lead to including a remote script from a remote web site. An example of a vulnerable __autoload() function could be: function __autoload($class_name) { include $class_name . '.php'; } In the above example, were $class_name to include a remote URL, and if allow_url_fopen was enabled in php.ini, this could result in loading a remote PHP script on the server. This flaw does not affect PHP versions prior to 5.3.7 were this change was introduced. A fix is in PHP's subversion repository (r317183) [5]. [1] <a href="http://www.byte.nl/blog/2011/09/23/security-bug-in-is_a-function-in-php-5-3-7-5-3-8/">http://www.byte.nl/blog/2011/09/23/security-bug-in-is_a-function-in-php-5-3-7-5-3-8/</a> [2] <a href="https://bugs.php.net/bug.php?id=55475">https://bugs.php.net/bug.php?id=55475</a> [3] <a href="https://bugs.php.net/bug.php?id=53727">https://bugs.php.net/bug.php?id=53727</a> [4] <a href="http://svn.php.net/viewvc/?view=revision&amp;revision=312904">http://svn.php.net/viewvc/?view=revision&amp;revision=312904</a> [5] <a href="http://svn.php.net/viewvc/?view=revision&amp;revision=317183">http://svn.php.net/viewvc/?view=revision&amp;revision=317183</a> Statement: Not vulnerable. This issue did not affect the versions of php as shipped with Red Hat Enterprise Linux 4, 5, or 6.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| PHP PHP | =5.3.8 | |
| PHP PHP | =5.3.7 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=741020
- https://bugs.php.net/bug.php?id=55475
- http://www.securityfocus.com/archive/1/519770/30/0/threaded
- http://www.byte.nl/blog/2011/09/23/security-bug-in-is_a-function-in-php-5-3-7-5-3-8/
- http://svn.php.net/viewvc/?view=revision&revision=317183
- http://securityreason.com/securityalert/8525
- http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041
- https://bugs.php.net/bug.php?id=53727
- http://svn.php.net/viewvc/?view=revision&revision=312904
- http://svn.php.net/viewvc/?view=revision&revision=317183
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=741022
- https://access.redhat.com/security/cve/CVE-2011-3379
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