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RoundCube 0.6 Content Spoofing / Cross Site Scripting

RoundCube 0.6 Content Spoofing / Cross Site Scripting
Posted Dec 1, 2011
Authored by MustLive

RoundCube version 0.6 suffers from cross site scripting, content spoofing, brute force and clickjacking inclusion vulnerabilities.

tags | exploit, spoof, vulnerability, xss
MD5 | d03bb67175df26d5b085168489904317

RoundCube 0.6 Content Spoofing / Cross Site Scripting

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Hello list!

I want to warn you about multiple vulnerabilities in RoundCube.

These are Brute Force, Content Spoofing, Cross-Site Scripting and
Clickjacking vulnerabilities. CS and XSS are in TinyMCE, which is included
with RoundCube.

Affected products:

Vulnerable are RoundCube 0.6 and previous versions (checked in 0.4-beta and
0.6). In last version RoundCube 0.6 uses moxieplayer.swf (instead of

As the developers informed me, these vulnerabilities will be fixed in
version RoundCube 0.7.


Brute Force (WASC-11):


Content Spoofing (WASC-12):

Swf-file of flvPlayer 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.




Swf-file of flvPlayer 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"?>
<item name="Content Spoofing" thumbnail="1.jpg" url="1.flv"/>
<item name="Content Spoofing" thumbnail="2.jpg" url="2.flv"/>

XSS (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:

function flvStart() {
function flvEnd() {
<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

Content Spoofing (WASC-12):


This swf-file accepts arbitrary addresses in parameter url, which allows to
spoof content of flash - i.e. by setting address of video file from other


RoundCube is vulnerable to remote login with using of Clickjacking
About such attacks I've wrote already in my article.

In version RoundCube 0.6-RC there was added protection against Clickjacking
attack (except above-mentioned login form), to which all functionality of
the application is vulnerable. But the method is not effective enough,
because it works only in new versions of some browsers, so all users of
older browsers are unprotected. And old versions of RoundCube are fully
vulnerable to Clickjacking.


2011.10.15 - found vulnerabilities.
2011.10.18 - announced at my site.
2011.10.21 - informed developer of RoundCube. During my conversation with
developer during October-November, he decided to fix them and was working on
fixes for these holes.
2011.11.23 - developer of RoundCube informed that all fixes have been made
and would be added to the next release RoundCube 0.7.
2011.11.30 - disclosed at my site.

I mentioned about these vulnerabilities at my site:

Best wishes & regards,
Administrator of Websecurity web site

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