As mentioned in this new security advisory from Avaya, there's a risk that the PHP version included with their Messaging systems could provide a hole for a would-be attacker to gain access.

Issues have been reported in the following:

• integer overflow vulnerabilities in the PHP gd extension
• integer overflow vulnerability in the PHP chunk_split function
• a security update has introduced a bug into PHP session cookie handling
• vulnerability in the PHP money_format function
• vulnerability in the PHP wordwrap function
• vulnerability in PHP session cookie handling
• vulnerability in the PHP gc extension

The advisory contains links to more information from RedHat on these issues and includes a list of systems effected as well as recommended actions to take.