Cisco Adaptive Security Appliance and Firepower Threat Defense fix an actively exploited vulnerability

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[TLP:CLEAR] Cisco Adaptive Security Appliance and Firepower Threat Defense fix an actively exploited vulnerability

Based on evidence of active exploitation, CISA has added to its catalog of known exploited vulnerabilities a vulnerability affecting the Remote Access VPN (RAVPN) service in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software [1]. The fixed versions can be determined using the Cisco Software Checker tool [2]: on the first page, enter the product type and version; on the second, select all impact assessments and security advisories; and on the last page, choose the highest of the displayed fixed versions and update the affected device to it. If updating is not possible, to reduce the likelihood of an attack and limit the possible impacts it is recommended to enable logging and configure threat detection features for RAVPN services, which automatically block IP addresses exceeding the configured limits of login attempts. If these features are not supported in the given Secure Firewall version, it is recommended to use hardening measures such as disabling AAA authentication or disabling Secure Firewall Posture (Hostscan). Detailed information can be found at [3].

Cisco Adaptive Security Appliance and Firepower Threat Defense - denial of service (CVE-2024-20481)

CVSS 5.8 (Medium)

An unauthenticated remote attacker is able, by sending a large number of VPN authentication requests, to carry out a DoS attack on the RAPVN service. Services unrelated to VPN are not affected [4]. IoCs of a possible attack can be found at [5].

The vulnerability is present in products:

Adaptive Security Appliance Software (ASA);
Firepower Threat Defense Software (FTD);

CVSS: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

More information:

CVE-2024-20481 at cve.org, NVD
CWE-772: Missing Release of Resource after Effective Lifetime at cwe.mitre.org

The vulnerability was publicly disclosed 23. 10. 2024.

Links

By CESNET, z.s.p.o. Michaela Ručková on 4. 11. 2024.

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[TLP:CLEAR] Cisco Adaptive Security Appliance and Firepower Threat Defense fix an actively exploited vulnerability

Cisco Adaptive Security Appliance and Firepower Threat Defense - denial of service (CVE-2024-20481)

CVSS 5.8 (Medium)

Links