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This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided.
PHP before 4.4.3 and 5.x before 5.1.4 does not limit the character set of the session identifier (PHPSESSID) for third party session handlers, which might make it easier for remote attackers to exploit other vulnerabilities by inserting PHP code into the PHPSESSID, which is stored in the session file. NOTE: it could be argued that this not a vulnerability in PHP itself, rather a design limitation that enables certain attacks against session handlers that do not account for this limitation.
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We do not consider this to be a PHP flaw. The problem is caused by the insufficient input validation performed by Zend platform.
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http://www.securityfocus.com/archive/1/444263/100/0/threaded [No Types Assigned]
http://www.securityfocus.com/archive/1/archive/1/444263/100/0/threaded [Patch, Vendor Advisory]