CVE-2024-20355
First published: Wed May 22 2024(Updated: )
A vulnerability in the implementation of SAML 2.0 single sign-on (SSO) for remote access VPN services in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to successfully establish a VPN session on an affected device. This vulnerability is due to improper separation of authorization domains when using SAML authentication. An attacker could exploit this vulnerability by using valid credentials to successfully authenticate using their designated connection profile (tunnel group), intercepting the SAML SSO token that is sent back from the Cisco ASA device, and then submitting the same SAML SSO token to a different tunnel group for authentication. A successful exploit could allow the attacker to establish a remote access VPN session using a connection profile that they are not authorized to use and connect to secured networks behind the affected device that they are not authorized to access. For successful exploitation, the attacker must have valid remote access VPN user credentials.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Adaptive Security Appliance Software | ||
| Cisco Firepower Threat Defense |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2024-20355?
CVE-2024-20355 is rated as a high-severity vulnerability that could allow authenticated remote attackers to establish unauthorized VPN sessions.
How do I fix CVE-2024-20355?
To resolve CVE-2024-20355, update to the latest version of Cisco Adaptive Security Appliance (ASA) Software or Cisco Firepower Threat Defense (FTD) Software as recommended by Cisco.
What are the affected products for CVE-2024-20355?
CVE-2024-20355 affects Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software.
What type of attacks can CVE-2024-20355 facilitate?
CVE-2024-20355 can facilitate unauthorized VPN access by requiring only authenticated credentials from the attacker.
Is it necessary to implement additional security measures despite patching CVE-2024-20355?
Yes, it is advisable to implement additional security measures such as multi-factor authentication to enhance security even after patching CVE-2024-20355.
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