Cisco Adaptive Security Appliance Software SSL/TLS DoS (cisco-sa-asa-ssl-vpn-dos-qY7BHpjN)

high Nessus Plugin ID 136916

Synopsis

The remote device is missing a vendor-supplied security patch

Description

A vulnerability exists in the Secure Sockets Layer (SSL)/Transport Layer Security (TLS) handler of Cisco Adaptive Security Appliance (ASA) Software due to improper resource management for inbound SSL/TLS connections. An unauthenticated, remote attacker can exploit this, by establishing multiple SSL/TLS connections with specific conditions to the affected device, in order to exhaust memory resources on the affected device, leading to a denial of service (DoS) condition.

Please see the included Cisco BIDs 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 the Cisco Security Advisory

See Also

http://www.nessus.org/u?6420bb6e

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvp49481

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvp93468

Plugin Details

Severity: High

ID: 136916

File Name: cisco-sa-asa-ssl-vpn-dos-qY7BHpjN-asa.nasl

Version: 1.9

Type: local

Family: CISCO

Published: 5/27/2020

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-2020-3196

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: 5/6/2020

Vulnerability Publication Date: 5/6/2020

Reference Information

CVE: CVE-2020-3196

CISCO-SA: cisco-sa-asa-ssl-vpn-dos-qY7BHpjN

IAVA: 2020-A-0205-S

CISCO-BUG-ID: CSCvp49481, CSCvp93468