Secunia

Multiple vulnerabilities have been reported in PHP, some of which have unknown impacts and others that can be exploited by malicious users to bypass certain security restrictions and by malicious people to conduct cross-site scripting attacks and cause a DoS (Denial of Service).

1) An error in "tempnam()" can be exploited to bypass the "safe_mode" feature.

2) An error in "posix_mkfifo()" can be exploited to bypass the "open_basedir" feature.

3) An error within the processing of form-based file uploads can be exploited to cause a DoS by sending specially crafted requests.

4) Errors related to a insufficient protection of $_SESSION against interrupt corruption and a weak "session.save_path" check have unknown impacts.

5) The "htmlspecialchars()" function does not properly sanitise certain input, which can be exploited to conduct cross-site scripting attacks.

The vulnerabilities are reported in versions prior to 5.2.12.

Solution
Update to version 5.2.12.

Provided and/or discovered by
1, 2) Grzegorz Stachowiak
3) Bogdan Calin, Acunetix
4) Stefan Esser
5) Moriyoshi

Changelog
Further details available in Customer Area

Original Advisory
PHP:
http://www.php.net/releases/5_2_12.php
http://bugs.php.net/bug.php?id=49785

Grzegorz Stachowiak:
http://securityreason.com/securityalert/6600
http://securityreason.com/securityalert/6601

Acunetix:
http://www.acunetix.com/blog/websecuritynews/php-multipartform-data-denial-of-service/

Deep Links
Links available in Customer Area