CVE-2024-20337 Cross-site scripting in Cisco Secure Client
An attacker can inject CRLF sequences to execute scripts and steal SAML tokens, enabling unauthorized VPN access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2024-20337?
CVE-2024-20337 is a high-severity cross-site scripting vulnerability in Cisco Secure Client, published on 6 Mar 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A vulnerability in the SAML authentication process of Cisco Secure Client could allow an unauthenticated, remote attacker to conduct a carriage return line feed (CRLF) injection attack against a user. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a crafted link while establishing a VPN session. A successful exploit could allow the attacker to execute arbitrary script code in the browser or access sensitive, browser-based information, including a valid SAML token. The attacker could then use the token to establish a remote access VPN session with the privileges of the affected user. Individual hosts and services behind the VPN headend would still need additional credentials for successful access.
Weakness: CWE-93
Which versions are affected by CVE-2024-20337?
It affects 1 product.
Products include Cisco Secure Client.
How do I fix CVE-2024-20337?
No fix has been published for CVE-2024-20337 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2024-20337 being exploited?
There is no known exploitation of CVE-2024-20337 in the wild and no public exploit code.
Other vulnerabilities in Cisco Secure Client
Sources
Also known as GHSA-j296-jhq5-3x6c.