Cisco IOS XE Software for Catalyst 9200 Series Switches Umbrella Connector DoS (cisco-sa-iosxe-umbrella-dos-t2QMUX37)

High Nessus Plugin ID 141398

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VPR Score: 4.4

Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, IOS-XE is affected by a DoS vulnerability in the Umbrella Connector component of Cisco IOS XE Software for Cisco Catalyst 9200 Series Switches due to insufficient error handling when parsing DNS requests. An unauthenticated, remote attacker could exploit this vulnerability by sending a series of malicious DNS requests to an Umbrella Connector client interface of an affected device. A successful exploit could allow the attacker to cause a crash of the iosd process, which triggers a reload of the affected device and 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 CSCvr57231

See Also

http://www.nessus.org/u?06b0d48f

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

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvr57231

Plugin Details

Severity: High

ID: 141398

File Name: cisco-sa-iosxe-umbrella-dos-t2QMUX37-iosxe.nasl

Version: 1.5

Type: local

Family: CISCO

Published: 2020/10/13

Updated: 2020/10/14

Dependencies: 67217

Risk Information

Risk Factor: High

VPR Score: 4.4

CVSS Score Source: CVE-2020-3510

CVSS v2.0

Base Score: 7.1

Temporal Score: 5.3

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

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:/o:cisco:ios_xe

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

Exploit Ease: No known exploits are available

Patch Publication Date: 2020/09/24

Vulnerability Publication Date: 2020/09/24

Reference Information

CVE: CVE-2020-3510

CISCO-BUG-ID: CSCvr57231

CISCO-SA: cisco-sa-iosxe-umbrella-dos-t2QMUX37

IAVA: 2020-A-0439

CWE: 388