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TITLE:
MyBB "Referer" Header "my_post_key" Token Disclosure

SECUNIA ADVISORY ID:
SA32880

VERIFY ADVISORY:
http://secunia.com/advisories/32880/

CRITICAL:
Less critical

IMPACT:
Hijacking, Cross Site Scripting, Exposure of sensitive information

WHERE:
>From remote

SOFTWARE:
MyBB (formerly MyBulletinBoard) 1.x
http://secunia.com/advisories/product/4479/

DESCRIPTION:
NBBN has discovered some vulnerabilities in MyBB, which can be
exploited can be exploited by malicious people to disclose sensitive
information.

The problem is that the "my_post_key" token is included in the
"Referer" HTTP header when sending certain requests for e.g. images
referencing external web sites (e.g. when performing various
moderation actions, like splitting and merging a thread or deleting
posts). This can be exploited to disclose a user's secret token by
tricking the user into performing an affected operation.

Successful exploitation may open up for various cross-site request
forgery and cross-site scripting attacks.

The vulnerability is confirmed in version 1.4.3. Other versions may
also be affected.

SOLUTION:
Disable sending of the "Referer" HTTP header.

PROVIDED AND/OR DISCOVERED BY:
NBBN

ORIGINAL ADVISORY:
http://packetstorm.linuxsecurity.com/0811-exploits/mybb-disclose.txt

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