CVE-2020-3580

Multiple vulnerabilities in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct cross-site scripting (XSS) attacks against a user of the web services interface of an affected device. The vulnerabilities are due to insufficient validation of user-supplied input by the web services interface of an affected device. An attacker could exploit these vulnerabilities by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or allow the attacker to access sensitive, browser-based information. Note: These vulnerabilities affect only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section.

Recent assessments:

MadDud at June 25, 2021 12:48pm UTC reported:

Proof of Concept of the XSS attack is publicly available.

This is an XSS attack, which doesn’t require authentication to plant the code, but it requires user interaction (visit something in web interface) to trigger it.

Original tweet: <https://twitter.com/ptswarm/status/1408050644460650502&gt;
Copy of tweet (screenshot) and analysis <https://www.tenable.com/blog/cve-2020-3580-proof-of-concept-published-for-cisco-asa-flaw-patched-in-october&gt;

ccondon-r7 at June 25, 2021 8:24pm UTC reported:

Proof of Concept of the XSS attack is publicly available.

This is an XSS attack, which doesn’t require authentication to plant the code, but it requires user interaction (visit something in web interface) to trigger it.

Original tweet: <https://twitter.com/ptswarm/status/1408050644460650502&gt;
Copy of tweet (screenshot) and analysis <https://www.tenable.com/blog/cve-2020-3580-proof-of-concept-published-for-cisco-asa-flaw-patched-in-october&gt;

Assessed Attacker Value: 3
Assessed Attacker Value: 3Assessed Attacker Value: 5