SB2024102402 - Denial of service in Cisco Adaptive Security Appliance and Firepower Threat Defense Software Remote Access SSL VPN Authentication

Description

This security bulletin contains information about 1 vulnerability.

1) Use of insufficiently random values (CVE-ID: CVE-2024-20331)

CWE-ID: CWE-330 - Use of Insufficiently Random Values

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient entropy in the authentication process in the session authentication functionality of the Remote Access SSL VPN feature. A remote attacker can determining the handle of an authenticating user and use it to terminate their authentication session, resulting in a denial of service condition.

Remediation

Install update from vendor's website.

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-vpn-nyH3fhp
• https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwf34070