Cisco IOS XE Software Split DNS DoS (cisco-sa-splitdns-SPWqpdGW)

high Nessus Plugin ID 141171
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote device is missing a vendor-supplied security patch.

Description

According to its self-reported version, Cisco IOS XE Software is affected by a denial of service (DoS) vulnerability as the Split DNS feature's regular expression (regex) engine may time out when processing the DNS name list configuration. An unauthenticated, remote attacker could cause an affected device to reload, resulting in a denial of service.

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 CSCvt78186

See Also

http://www.nessus.org/u?a2f37dff

http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-74268

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvt78186

Plugin Details

Severity: High

ID: 141171

File Name: cisco-sa-splitdns-SPWqpdGW-iosxe.nasl

Version: 1.10

Type: local

Family: CISCO

Published: 10/5/2020

Updated: 1/8/2021

Dependencies: cisco_ios_xe_version.nasl

Risk Information

CVSS Score Source: CVE-2020-3408

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

Temporal Vector: E:U/RL:OF/RC:C

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: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:ios_xe

Required KB Items: Host/Cisco/IOS-XE/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 9/24/2020

Vulnerability Publication Date: 9/24/2020

Reference Information

CVE: CVE-2020-3408

CISCO-BUG-ID: CSCvt78186

CISCO-SA: cisco-sa-splitdns-SPWqpdGW

IAVA: 2020-A-0439

CWE: 185