Denial of service in Cisco Adaptive Security Appliance and Firepower Threat Defense Software SSL VPN

1) Access of Memory Location After End of Buffer

EUVDB-ID: #VU99289

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-20402

CWE-ID: CWE-788 - Access of Memory Location After End of Buffer

Exploit availability: No

Description

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

The vulnerability exists due to a logic error in memory management when the device is handling SSL VPN connections. A remote attacker can send specially crafted SSL/TLS packets to the SSL VPN server of the affected device and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Firepower Threat Defense (FTD): 7.0.0 - 7.0.6.2

Cisco Adaptive Security Appliance (ASA): 9.8.0.56 - 9.19.1.37

CPE2.3

• cpe:2.3:h:cisco_systems:cisco_ftd:7.0.6.2:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.16.4.61:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.18.4.29:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.19.1.37:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.17.1.45:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.15.1.21:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.14.4.24:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.13.1.21:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.12.4.67:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.10.1.44:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.9.2.235:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:asa:9.8.4.48:*:*:*:*:*:*:*

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-dos-hOnB9pH4
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCwb00494
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCwj82247

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.