Cisco IOS Software ISDN Q.931 DoS (cisco-sa-iosxe-isdn-q931-dos-67eUZBTf)

high Nessus Plugin ID 141373

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Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, IOS is affected by a DoS vulnerability in the ISDN subsystem due to insufficient input validation when the ISDN Q.931 messages are processed. An unauthenticated, adjacent attacker could exploit this vulnerability by sending a malicious ISDN Q.931 message to an affected device. A successful exploit could allow the attacker to cause the process to crash, resulting in a DoS condition.

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

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvr57760

Plugin Details

Severity: High

ID: 141373

File Name: cisco-sa-iosxe-isdn-q931-dos-67eUZBTf-ios.nasl

Version: 1.12

Type: combined

Family: CISCO

Published: 10/12/2020

Updated: 9/28/2023

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.5

Vector: CVSS2#AV:A/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2020-3511

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.4

Vector: CVSS:3.0/AV:A/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:/o:cisco:ios

Required KB Items: Host/Cisco/IOS/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 9/24/2020

Vulnerability Publication Date: 9/24/2020

Reference Information

CVE: CVE-2020-3511

CWE: 20

CISCO-SA: cisco-sa-iosxe-isdn-q931-dos-67eUZBTf

IAVA: 2020-A-0439-S

CISCO-BUG-ID: CSCvr57760

Detections

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