TITLE:
PHP "html_entity_decode()" Information Disclosure Vulnerability

SECUNIA ADVISORY ID:
SA19383

VERIFY ADVISORY:
http://secunia.com/advisories/19383/

CRITICAL:
Less critical

IMPACT:
Exposure of sensitive information

WHERE:
>From remote

SOFTWARE:
PHP 4.3.x
http://secunia.com/product/922/
PHP 4.4.x
http://secunia.com/product/5768/
PHP 5.0.x
http://secunia.com/product/3919/
PHP 5.1.x
http://secunia.com/product/6796/

DESCRIPTION:
A vulnerability has been discovered in PHP, which can be exploited by
malicious people to gain knowledge of potentially sensitive
information.

The vulnerability is caused due to the "html_entity_decode()" PHP
function not being binary safe. This can be exploited to disclose
certain part of the memory via a script calling the
"html_entity_decode()" function with input controlled by the attacker
and where the result is sent to the attacker.

Successful may allow disclosure of e.g. passwords stored in a PHP
script.

The vulnerability has been confirmed in versions 4.4.2 and 5.1.2.
Prior versions may also be affected.

SOLUTION:
The vulnerability has been fixed in the CVS repository and in version
5.1.3-RC1.

Do not call the "html_entity_decode()" function in PHP scripts where
the input originates from untrusted sources.

PROVIDED AND/OR DISCOVERED BY:
Discovered by the vendor and reported to public mailing lists by Tõnu
Samuel.

ORIGINAL ADVISORY:
Tõnu Samuel:
http://archives.neohapsis.com/archives/fulldisclosure/2006-03/1675.html

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