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MyBB "Referer" Header "my_post_key" Token Disclosure

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Release Date:  2008-11-26    Last Update:  2009-12-14    Views:  5,692

Secunia Advisory SA32880

Where:

From remote

Impact:

Hijacking, Cross Site Scripting, Exposure of sensitive information

Solution Status:

Vendor Patch

CVE Reference(s):

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:
Update to version 1.4.4.

Provided and/or discovered by:
NBBN

Original Advisory:
http://packetstorm.linuxsecurity.com/0811-exploits/mybb-disclose.txt

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

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

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