Detections
Analytics
Cisco Firepower Threat Defense AnyConnect SSL VPN DoS (cisco-sa-vpndtls-dos-TunzLEV)
high Nessus Plugin ID 160306
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Synopsis
The remote device is missing a vendor-supplied security patchDescription
According to its self-reported version, Cisco FTD Software is affected by a vulnerability in the implementation of the Datagram TLS (DTLS) protocol that could allow an unauthenticated, remote attacker to cause high CPU utilization, resulting in a denial of service (DoS) condition. This vulnerability is due to suboptimal processing that occurs when establishing a DTLS tunnel as part of an AnyConnect SSL VPN connection. An attacker could exploit this vulnerability by sending a steady stream of crafted DTLS traffic to an affected device. A successful exploit could allow the attacker to exhaust resources on the affected VPN headend device. This could cause existing DTLS tunnels to stop passing traffic and prevent new DTLS tunnels from establishing, resulting in a DoS condition. Note: When the attack traffic stops, the device recovers gracefully.Please see the included Cisco BIDs and Cisco Security Advisory for more information.
Solution
Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvz09106See Also
Plugin Details
Severity: High
ID: 160306
File Name: cisco-sa-vpndtls-dos-TunzLEV_ftd.nasl
Version: 1.8
Type: local
Family: CISCO
Published: 4/28/2022
Updated: 5/6/2022
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.6
CVSS v2
Risk Factor: Medium
Base Score: 5
Temporal Score: 3.7
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS Score Source: CVE-2022-20795
CVSS v3
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/a:cisco:firepower_threat_defense
Required KB Items: installed_sw/Cisco Firepower Threat Defense
Exploit Ease: No known exploits are available
Patch Publication Date: 4/20/2022
Vulnerability Publication Date: 4/20/2022
Reference Information
CVE: CVE-2022-20795