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Secunia Security Advisory 20659

Secunia Security Advisory 20659
Posted Jun 29, 2006
Authored by Secunia | Site secunia.com

Secunia Security Advisory - Bartek Ryniec has discovered a vulnerability in MyBB, which can be exploited by malicious people to conduct cross-site request forgery attacks.

tags | advisory, csrf
SHA-256 | 87dd32394197146ac6f7a9d28b19b8fcddbcaa339b383992782f21d98eab2e95

Secunia Security Advisory 20659

Change Mirror Download


----------------------------------------------------------------------

Reverse Engineer Wanted

Secunia offers a Security Specialist position with emphasis on
reverse engineering of software and exploit code, auditing of
source code, and analysis of vulnerability reports.

http://secunia.com/secunia_security_specialist/

----------------------------------------------------------------------

TITLE:
MyBB editpost.php Cross-Site Request Forgery

SECUNIA ADVISORY ID:
SA20659

VERIFY ADVISORY:
http://secunia.com/advisories/20659/

CRITICAL:
Less critical

IMPACT:
Hijacking

WHERE:
>From remote

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

DESCRIPTION:
Bartek Ryniec has discovered a vulnerability in MyBB, which can be
exploited by malicious people to conduct cross-site request forgery
attacks.

The vulnerability is caused due to the application allowing forum
posts to be deleted via HTTP GET requests without performing any
validity checks to verify the request. This can be exploited by e.g.
a non-privileged user to delete arbitrary forum post when a malicious
post that contains a specially crafted [img] tag is viewed by the
administrative user.

Example:
[img]http://[host]/editpost.php?action=deletepost&pid=[post_id]&delete=yes[/img]

The vulnerability has been confirmed in version 1.1.3 and 1.1.4.
Other versions may also be affected.

SOLUTION:
The vulnerability has been partially fixed in version 1.1.5 by only
allowing POST requests when deleting forum posts.

Do not browse untrusted web sites while being logged in to MyBB.

PROVIDED AND/OR DISCOVERED BY:
Bartek Ryniec

----------------------------------------------------------------------

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------

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