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TITLE:
vBulletin BB Code Script Insertion Vulnerability

SECUNIA ADVISORY ID:
SA39662

VERIFY ADVISORY:
http://secunia.com/advisories/39662/

DESCRIPTION:
MaXe has reported a vulnerability in vBulletin, which can be
exploited by malicious users to conduct script insertion attacks.

The vulnerability exists in the parsing of BB Code when creating
content that uses custom tags. This can be exploited to insert
arbitrary HTML and script code, which will be executed in a user's
browser session in context of an affected site when the malicious
data is being viewed.

Successful exploitation requires that "Custom BB Code" tags utilize
HTML tags without quotation in e.g. "href" attribute of the "a" tag.

The vulnerability is reported in version 3.8.4 PL2 and 4.0.3. Other
versions may also be affected.

SOLUTION:
Edit the source code to ensure that input is properly sanitised.

Reportedly, the vulnerability will be fixed in version 4.0.4.

PROVIDED AND/OR DISCOVERED BY:
MaXe of InterN0T

ORIGINAL ADVISORY:
http://forum.intern0t.net/intern0t-advisories/2528-vbulletin-3-8-4-pl2-insecure-custom-bbcode.html

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