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TITLE:
MyBB Cross-Site Scripting and Script Insertion Vulnerabilities

SECUNIA ADVISORY ID:
SA21697

VERIFY ADVISORY:
http://secunia.com/advisories/21697/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

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

DESCRIPTION:
imei addmimistrator has reported two vulnerabilities in MyBB, which
can be exploited by malicious people to conduct cross-site scripting
and script insertion attacks.

1) Input passed via the "url" BBcode tag when posting isn't properly
sanitised before being used. This can be exploited to inject
arbitrary HTML and script code, which will be executed in a user's
browser session in context of an affected site when a link with the
"javascript:" URI handler from a malicious post is followed.

Example:
[url]java& 115;cript://%0a%0[code];[/url]

2) Input passed via the URL path in admin/index.php isn't properly
sanitised before being returned to the user. This can be exploited to
execute arbitrary HTML and script code in a user's browser session in
context of an affected site.

Example:
http://[host]/admin/index.php/[code]

The vulnerabilities have been reported in version 1.1.7. Prior
versions may also be affected.

SOLUTION:
Update to version 1.1.8.
http://www.mybboard.com/downloads.php

PROVIDED AND/OR DISCOVERED BY:
imei addmimistrator

ORIGINAL ADVISORY:
http://myimei.com/security/2006-08-15/mybb-117-htmlspeacialchar_uni-fixjavascript-functions_postphp-urlxss-attack.html
http://myimei.com/security/2006-08-17/mybb-117-adminglobalphp-xss-attack.html

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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:
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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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