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TITLE:
PHP "unserialize()" S: Data Type Information Leak

SECUNIA ADVISORY ID:
SA24630

VERIFY ADVISORY:
http://secunia.com/advisories/24630/

CRITICAL:
Less critical

IMPACT:
Exposure of sensitive information

WHERE:
>From remote

SOFTWARE:
PHP 5.2.x
http://secunia.com/product/13446/

DESCRIPTION:
Stefan Esser has reported a vulnerability in PHP, which can be
exploited by malicious people to disclose potentially sensitive
information.

The vulnerability is caused due to an error within the
"unserialize()" function when unserialising specially escaped S: data
types. This can be exploited to e.g. disclose certain parts of the
heap memory.

The vulnerability is reported in version 5.2.1.

SOLUTION:
Do not use the "unserialize()" function on untrusted data.

PROVIDED AND/OR DISCOVERED BY:
Stefan Esser

ORIGINAL ADVISORY:
http://www.php-security.org/MOPB/MOPB-29-2007.html

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