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TITLE:
PHP "error_log()" Safe Mode Bypass Weakness

SECUNIA ADVISORY ID:
SA20818

VERIFY ADVISORY:
http://secunia.com/advisories/20818/

CRITICAL:
Not critical

IMPACT:
Security Bypass

WHERE:
Local system

SOFTWARE:
PHP 4.4.x
http://secunia.com/product/5768/
PHP 5.1.x
http://secunia.com/product/6796/

DESCRIPTION:
Maksymilian Arciemowicz has discovered a weakness in PHP, which can
be exploited by malicious, local users to bypass certain security
restrictions.

The weakness is caused due to an input validation error in the
"error_log()" PHP function in the processing of the destination
parameter. This can be exploited to bypass the safe mode protection
via directory traversal attacks in the "php://" wrapper.

The weakness has been confirmed in version 5.1.4 and has also been
reported in version 4.4.2. Other versions may also be affected.

SOLUTION:
Do not solely rely on the safe mode protection to protect against
malicious PHP scripts.

Disable the "error_log" function via the "disable_functions"
directive if the safe mode protection is required. This may affect
functionality.

PROVIDED AND/OR DISCOVERED BY:
Maksymilian Arciemowicz

ORIGINAL ADVISORY:
http://securityreason.com/achievement_securityalert/41

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About:
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