Vulnerabilities
Misconfiguration
Runtime Security
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CVE Vulnerabilities

CVE-2024-20493

Missing Release of Resource after Effective Lifetime

Published: Oct 23, 2024 | Modified: Nov 01, 2024
CVSS 3.x
5.3
MEDIUM
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS 2.x
RedHat/V2
RedHat/V3
Ubuntu
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2024-20493
CWEhttps://cwe.mitre.org/data/definitions/772.html

A vulnerability in the login authentication functionality of the Remote Access SSL VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to deny further VPN user authentications for several minutes, resulting in a temporary denial of service (DoS) condition. This vulnerability is due to ineffective handling of memory resources during the authentication process. An attacker could exploit this vulnerability by sending crafted packets, which could cause resource exhaustion of the authentication process. A successful exploit could allow the attacker to deny authentication for Remote Access SSL VPN users for several minutes, resulting in a temporary DoS condition.

Weakness

The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.

Affected Software

Name Vendor Start Version End Version
Firepower_threat_defense_software Cisco 6.2.3 (including) 6.2.3 (including)
Firepower_threat_defense_software Cisco 6.2.3.1 (including) 6.2.3.1 (including)
Firepower_threat_defense_software Cisco 6.2.3.2 (including) 6.2.3.2 (including)
Firepower_threat_defense_software Cisco 6.2.3.3 (including) 6.2.3.3 (including)
Firepower_threat_defense_software Cisco 6.2.3.4 (including) 6.2.3.4 (including)
Firepower_threat_defense_software Cisco 6.2.3.5 (including) 6.2.3.5 (including)
Firepower_threat_defense_software Cisco 6.2.3.6 (including) 6.2.3.6 (including)
Firepower_threat_defense_software Cisco 6.2.3.7 (including) 6.2.3.7 (including)
Firepower_threat_defense_software Cisco 6.2.3.8 (including) 6.2.3.8 (including)
Firepower_threat_defense_software Cisco 6.2.3.9 (including) 6.2.3.9 (including)
Firepower_threat_defense_software Cisco 6.2.3.10 (including) 6.2.3.10 (including)
Firepower_threat_defense_software Cisco 6.2.3.11 (including) 6.2.3.11 (including)
Firepower_threat_defense_software Cisco 6.2.3.12 (including) 6.2.3.12 (including)
Firepower_threat_defense_software Cisco 6.2.3.13 (including) 6.2.3.13 (including)
Firepower_threat_defense_software Cisco 6.2.3.14 (including) 6.2.3.14 (including)
Firepower_threat_defense_software Cisco 6.2.3.15 (including) 6.2.3.15 (including)
Firepower_threat_defense_software Cisco 6.2.3.16 (including) 6.2.3.16 (including)
Firepower_threat_defense_software Cisco 6.2.3.17 (including) 6.2.3.17 (including)
Firepower_threat_defense_software Cisco 6.2.3.18 (including) 6.2.3.18 (including)
Firepower_threat_defense_software Cisco 6.4.0 (including) 6.4.0 (including)
Firepower_threat_defense_software Cisco 6.4.0.1 (including) 6.4.0.1 (including)
Firepower_threat_defense_software Cisco 6.4.0.2 (including) 6.4.0.2 (including)
Firepower_threat_defense_software Cisco 6.4.0.3 (including) 6.4.0.3 (including)
Firepower_threat_defense_software Cisco 6.4.0.4 (including) 6.4.0.4 (including)
Firepower_threat_defense_software Cisco 6.4.0.5 (including) 6.4.0.5 (including)
Firepower_threat_defense_software Cisco 6.4.0.6 (including) 6.4.0.6 (including)
Firepower_threat_defense_software Cisco 6.4.0.7 (including) 6.4.0.7 (including)
Firepower_threat_defense_software Cisco 6.4.0.8 (including) 6.4.0.8 (including)
Firepower_threat_defense_software Cisco 6.4.0.9 (including) 6.4.0.9 (including)
Firepower_threat_defense_software Cisco 6.4.0.10 (including) 6.4.0.10 (including)
Firepower_threat_defense_software Cisco 6.4.0.11 (including) 6.4.0.11 (including)
Firepower_threat_defense_software Cisco 6.4.0.12 (including) 6.4.0.12 (including)
Firepower_threat_defense_software Cisco 6.4.0.13 (including) 6.4.0.13 (including)
Firepower_threat_defense_software Cisco 6.4.0.14 (including) 6.4.0.14 (including)
Firepower_threat_defense_software Cisco 6.4.0.15 (including) 6.4.0.15 (including)
Firepower_threat_defense_software Cisco 6.4.0.16 (including) 6.4.0.16 (including)
Firepower_threat_defense_software Cisco 6.4.0.17 (including) 6.4.0.17 (including)
Firepower_threat_defense_software Cisco 6.4.0.18 (including) 6.4.0.18 (including)
Firepower_threat_defense_software Cisco 6.6.0 (including) 6.6.0 (including)
Firepower_threat_defense_software Cisco 6.6.0.1 (including) 6.6.0.1 (including)
Firepower_threat_defense_software Cisco 6.6.1 (including) 6.6.1 (including)
Firepower_threat_defense_software Cisco 6.6.3 (including) 6.6.3 (including)
Firepower_threat_defense_software Cisco 6.6.4 (including) 6.6.4 (including)
Firepower_threat_defense_software Cisco 6.6.5 (including) 6.6.5 (including)
Firepower_threat_defense_software Cisco 6.6.5.1 (including) 6.6.5.1 (including)
Firepower_threat_defense_software Cisco 6.6.5.2 (including) 6.6.5.2 (including)
Firepower_threat_defense_software Cisco 6.6.7 (including) 6.6.7 (including)
Firepower_threat_defense_software Cisco 6.6.7.1 (including) 6.6.7.1 (including)
Firepower_threat_defense_software Cisco 6.6.7.2 (including) 6.6.7.2 (including)
Firepower_threat_defense_software Cisco 6.7.0 (including) 6.7.0 (including)
Firepower_threat_defense_software Cisco 6.7.0.1 (including) 6.7.0.1 (including)
Firepower_threat_defense_software Cisco 6.7.0.2 (including) 6.7.0.2 (including)
Firepower_threat_defense_software Cisco 6.7.0.3 (including) 6.7.0.3 (including)
Firepower_threat_defense_software Cisco 7.0.0 (including) 7.0.0 (including)
Firepower_threat_defense_software Cisco 7.0.0.1 (including) 7.0.0.1 (including)
Firepower_threat_defense_software Cisco 7.0.1 (including) 7.0.1 (including)
Firepower_threat_defense_software Cisco 7.0.1.1 (including) 7.0.1.1 (including)
Firepower_threat_defense_software Cisco 7.0.2 (including) 7.0.2 (including)
Firepower_threat_defense_software Cisco 7.0.2.1 (including) 7.0.2.1 (including)
Firepower_threat_defense_software Cisco 7.0.3 (including) 7.0.3 (including)
Firepower_threat_defense_software Cisco 7.0.4 (including) 7.0.4 (including)
Firepower_threat_defense_software Cisco 7.0.5 (including) 7.0.5 (including)
Firepower_threat_defense_software Cisco 7.0.6 (including) 7.0.6 (including)
Firepower_threat_defense_software Cisco 7.0.6.1 (including) 7.0.6.1 (including)
Firepower_threat_defense_software Cisco 7.0.6.2 (including) 7.0.6.2 (including)
Firepower_threat_defense_software Cisco 7.1.0 (including) 7.1.0 (including)
Firepower_threat_defense_software Cisco 7.1.0.1 (including) 7.1.0.1 (including)
Firepower_threat_defense_software Cisco 7.1.0.2 (including) 7.1.0.2 (including)
Firepower_threat_defense_software Cisco 7.1.0.3 (including) 7.1.0.3 (including)
Firepower_threat_defense_software Cisco 7.2.0 (including) 7.2.0 (including)
Firepower_threat_defense_software Cisco 7.2.0.1 (including) 7.2.0.1 (including)
Firepower_threat_defense_software Cisco 7.2.1 (including) 7.2.1 (including)
Firepower_threat_defense_software Cisco 7.2.2 (including) 7.2.2 (including)
Firepower_threat_defense_software Cisco 7.2.3 (including) 7.2.3 (including)
Firepower_threat_defense_software Cisco 7.2.4 (including) 7.2.4 (including)
Firepower_threat_defense_software Cisco 7.2.4.1 (including) 7.2.4.1 (including)
Firepower_threat_defense_software Cisco 7.2.5 (including) 7.2.5 (including)
Firepower_threat_defense_software Cisco 7.2.5.1 (including) 7.2.5.1 (including)
Firepower_threat_defense_software Cisco 7.2.5.2 (including) 7.2.5.2 (including)
Firepower_threat_defense_software Cisco 7.2.6 (including) 7.2.6 (including)
Firepower_threat_defense_software Cisco 7.2.7 (including) 7.2.7 (including)
Firepower_threat_defense_software Cisco 7.2.8 (including) 7.2.8 (including)
Firepower_threat_defense_software Cisco 7.2.8.1 (including) 7.2.8.1 (including)
Firepower_threat_defense_software Cisco 7.3.0 (including) 7.3.0 (including)
Firepower_threat_defense_software Cisco 7.3.1 (including) 7.3.1 (including)
Firepower_threat_defense_software Cisco 7.3.1.1 (including) 7.3.1.1 (including)
Firepower_threat_defense_software Cisco 7.3.1.2 (including) 7.3.1.2 (including)
Firepower_threat_defense_software Cisco 7.4.0 (including) 7.4.0 (including)
Firepower_threat_defense_software Cisco 7.4.1 (including) 7.4.1 (including)
Firepower_threat_defense_software Cisco 7.4.1.1 (including) 7.4.1.1 (including)
Firepower_threat_defense_software Cisco 7.4.2 (including) 7.4.2 (including)

Potential Mitigations

  • Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
  • For example, languages such as Java, Ruby, and Lisp perform automatic garbage collection that releases memory for objects that have been deallocated.
  • Use resource-limiting settings provided by the operating system or environment. For example, when managing system resources in POSIX, setrlimit() can be used to set limits for certain types of resources, and getrlimit() can determine how many resources are available. However, these functions are not available on all operating systems.
  • When the current levels get close to the maximum that is defined for the application (see CWE-770), then limit the allocation of further resources to privileged users; alternately, begin releasing resources for less-privileged users. While this mitigation may protect the system from attack, it will not necessarily stop attackers from adversely impacting other users.
  • Ensure that the application performs the appropriate error checks and error handling in case resources become unavailable (CWE-703).

References

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