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TITLE:
PHP Session Handling Double Free Vulnerabilities

SECUNIA ADVISORY ID:
SA24505

VERIFY ADVISORY:
http://secunia.com/advisories/24505/

CRITICAL:
Less critical

IMPACT:
System access

WHERE:
Local system

SOFTWARE:
PHP 5.2.x
http://secunia.com/product/13446/
PHP 5.1.x
http://secunia.com/product/6796/
PHP 5.0.x
http://secunia.com/product/3919/

DESCRIPTION:
Stefan Esser has reported some vulnerabilities in PHP, which can be
exploited by malicious users people to compromise a vulnerable
system.

1) A double free error within the "session_regenerate_id()" function
can be exploited to execute arbitrary code with the privileges of the
PHP interpreter.

2) A double free error within the handling of rejected sessions in
PHP's internal storage module can be exploited to execute arbitrary
code with the privileges of the PHP interpreter.

Successful exploitation requires that a user can e.g. upload and
execute malicious PHP scripts. Remote exploitation may be possible,
but has not currently been proven.

The vulnerabilities are reported in version 5.2.0 and 5.2.1. Other
versions may also be affected.

SOLUTION:
Allow only trusted users to upload and execute PHP scripts.

PROVIDED AND/OR DISCOVERED BY:
Stefan Esser

ORIGINAL ADVISORY:
http://www.php-security.org/MOPB/MOPB-22-2007.html
http://www.php-security.org/MOPB/MOPB-23-2007.html

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About:
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