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TITLE:
PHP "FILTER_VALIDATE_EMAIL" Filter Newline Injection

SECUNIA ADVISORY ID:
SA24824

VERIFY ADVISORY:
http://secunia.com/advisories/24824/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
>From remote

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

DESCRIPTION:
Stefan Esser has reported a vulnerability in PHP, which can be
exploited by malicious people to bypass certain security
restrictions.

The vulnerability is caused due to the use of an incorrect regular
expression within the "FILTER_VALIDATE_EMAIL" filter of the
ext/filter extension. This can be exploited to inject newlines via
specially crafted email addresses, which may allow mail header
injection.

The vulnerability is reported in PHP 5.2.0 and 5.2.1. Other versions
may also be affected.

SOLUTION:
Do not use the "FILTER_VALIDATE_EMAIL" filter to validate email
addresses.

PROVIDED AND/OR DISCOVERED BY:
Stefan Esser

ORIGINAL ADVISORY:
http://www.php-security.org/MOPB/PMOPB-45-2007.html

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