Cisco Adaptive Security Appliance Software SSL/TLS Session DoS (cisco-sa-asa-ftd-tcp-dos-N3DMnU4T)

high Nessus Plugin ID 149314

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Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, the SSL/TLS session handler of Cisco Adaptive Security Appliance Software (ASA) is affected by denial of service vulnerability due to a memory leak when closing SSL/TLS connections in a specific state. An unauthenticated, remote attacker can exploit this by establishing several SSL/TLS sessions and ensuring they are closed under certain conditions. A successful exploit could allow the attacker to exhaust memory resources in the affected device, which would prevent it from processing new SSL/TLS connections, resulting in a DoS. Manual intervention is required to recover an affected device.

Please see the included Cisco BID and Cisco Security Advisory for more information.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvu46685

Plugin Details

Severity: High

ID: 149314

File Name: cisco-sa-asa-ftd-tcp-dos-N3DMnU4T-asa.nasl

Version: 1.7

Type: local

Family: CISCO

Published: 5/6/2021

Updated: 3/31/2023

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

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-2020-3572

CVSS v3

Risk Factor: High

Base Score: 8.6

Temporal Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:cisco:adaptive_security_appliance_software

Required KB Items: Host/Cisco/ASA

Exploit Ease: No known exploits are available

Patch Publication Date: 10/21/2020

Vulnerability Publication Date: 10/21/2020

Reference Information

CVE: CVE-2020-3572

CWE: 400

CISCO-SA: cisco-sa-asa-ftd-tcp-dos-N3DMnU4T

IAVA: 2020-A-0488-S

CISCO-BUG-ID: CSCvu46685

Detections

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