phpBB Input Filtering Flaw in BBCode '[URL]' Tag Permits Remote Cross-Site Scripting Attacks
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SecurityTracker Alert ID: 1007665
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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Updated: Sep 11 2003
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Original Entry Date: Sep 9 2003
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Impact: Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
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Exploit Included: Yes
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Version(s): 2.0.6
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Description: An input filtering vulnerability was reported in phpBB in the '[url]' BBCode tag. A remote user can conduct cross-site scripting attacks.
It is reported that a remote user can insert specially crafted BBCode URL tags into a forum message so that when a target user views
the message (or takes some action, such as clicking on a link within the message), arbitrary scripting code will be executed by
the target user's browser. The code will originate from the site running the phpBB software and will run in the security context
of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any,
associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site
acting as the target user.
A demonstration exploit tag is provided:
[url=http://www.google.fr" onclick=alert('Hello')]text[/url]
The
vendor has reportedly been notified.
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Impact: A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the
phpBB software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as
the target user.
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Solution: No solution was available at the time of this entry.
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Vendor URL: www.phpbb.com/ (Links to External Site)
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Cause: Input validation error
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Underlying OS: Linux (Any), UNIX (Any), Windows (Any)
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Reported By: <keupon_ps2@yahoo.fr>
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Message History:
None.
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Source Message Contents
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Date: 8 Sep 2003 21:43:59 -0000
From: <keupon_ps2@yahoo.fr>
Subject: XSS vulnerability in phpBB (an other ;-)
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Hello, i've just found a new xss vulnerability in phpBB 2.0.6 (i'm not
sure but i don't think that others versions are vulnerable).
This vulnerability is located in the [url][/url] bbcode.
You can insert javascript by doing a thing like that:
[url=www.google.fr" onclick=alert('Hello')]text[/url]
You can find differents ways to steal cookies and to stay discreet, just
put on your brain a few seconds ;-).
Actually, there is no patch available but i have warn phpBB developpers so
i think that they will release a patch in a few days.
PS:excuse me if my english isn't perfect but i'm french ;-).
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