TITLE:
PHP "mb_send_mail()" "To:" Header Injection Vulnerability

SECUNIA ADVISORY ID:
SA17763

VERIFY ADVISORY:
http://secunia.com/advisories/17763/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass, Manipulation of data

WHERE:
>From remote

SOFTWARE:
PHP 4.4.x
http://secunia.com/product/5768/
PHP 5.0.x
http://secunia.com/product/3919/

DESCRIPTION:
s.masugata has reported a vulnerability in PHP, which potentially can
be exploited by malicious people to use it as an open mail relay.

The vulnerability is caused due to an input validation error in the
"mb_send_mail()" function. This can be exploited to inject arbitrary
headers in a mail sent via a script calling the "mb_send_mail()"
function where the "To" parameter can be controlled by the attacker.

SOLUTION:
Update to version 5.1.0.
http://www.php.net/downloads.php

Do not call the "mb_send_mail()" function in scripts where input
passed to the "To" parameter originates from untrusted sources.

PROVIDED AND/OR DISCOVERED BY:
s.masugata

ORIGINAL ADVISORY:
The PHP Group:
http://www.php.net/release_5_1_0.php

s.masugata:
http://bugs.php.net/bug.php?id=35307

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