XSS on Cisco IOS HTTP Server

Credit: ProCheckUp
Risk: Low
Local: No
Remote: Yes

CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

PR08-19: XSS on Cisco IOS HTTP Server Date found: 1st August 2008 Vendor contacted: 1st August 2008 Advisory publicly released: 14th January 2009 Severity: Medium Credits: Adrian Pastor of ProCheckUp Ltd (www.procheckup.com) Description: Cisco IOS HTTP server is vulnerable to XSS within invalid parameters processed by the "/ping" server-side binary/script. Consequences: An attacker may be able to cause execution of malicious scripting code in the browser of a user who clicks on a link to the HTTP server of a Cisco device. This type of attack can result in non-persistent defacement of the target admin interface, or the redirection of confidential information to unauthorised third parties. i.e.: by scraping the data returned by the '/level/15/exec/-/show/run/CR' URL via the XMLHttpRequest object. It might also be possible to perform administrative changes by submitting forged commands (CSRF) within the payload of the XSS attack. i.e.: injecting an 'img' tag which points to '/level/15/configure/-/enable/secret/newpass' would change the enable password to 'newpass'. Notes: 1. The victim administrator needs to be currently authenticated for this vulnerability to be exploitable 2. In order to exploit this vulnerability successfully, the attacker only needs to know the IP address of the Cisco device. There is NO need to have access to the IOS HTTP server Proof of concept (PoC):<script>alert("Running+code+within+the_context+of+"%2bdocument.domain)</script> Content of HTML body returned: <BODY BGCOLOR=#FFFFFF><H2>test-router</H2><HR><DT>Error: URL syntax: ?<script>alert("Running code within the_context of "+document.domain)</script></BODY> Successfully tested on: Cisco 1803 Cisco IOS Software, C180X Software (C180X-ADVIPSERVICESK9-M), Version 12.4(6)T7, RELEASE SOFTWARE (fc5) Assigned Cisco Bug ID#: CSCsr72301 CVE reference: CVE-2008-3821 References: http://www.procheckup.com/vulnerability_manager/vulnerabilities/pr08-19 http://www.cisco.com/warp/public/707/cisco-sr-20090114-http.shtml Fix: Please see Cisco advisory for information on available updates. Legal: Copyright 2009 ProCheckUp Ltd. All rights reserved. Permission is granted for copying and circulating this Bulletin to the Internet community for the purpose of alerting them to problems, if and only if the Bulletin is not changed or edited in any way, is attributed to ProCheckUp indicating this web page URL, and provided such reproduction and/or distribution is performed for non-commercial purposes. Any other use of this information is prohibited. ProCheckUp is not liable for any misuse of this information by any third party. ProCheckUp is not responsible for the content of external Internet sites.



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