Cisco IOS XE Software Arbitrary Code Execution Vulnerability (cisco-sa-xbace-OnCEbyS)

High Nessus Plugin ID 141119

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VPR Score: 6.7

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 arbitrary code execution vulnerability, due to incorrect validations by boot scripts when specific ROM monitor (ROMMON) variables are set. An authenticated, local attacker could exploit this vulnerability by installing code to a specific directory in the underlying operating system (OS) and setting a specific ROMMON variable. A successful exploit could allow the attacker to execute persistent code on the underlying OS. To exploit this vulnerability, the attacker would need access to the root shell on the device or have physical access to the device.

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

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvs58715

See Also

http://www.nessus.org/u?217cd5d2

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

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvs58715

Plugin Details

Severity: High

ID: 141119

File Name: cisco-sa-xbace-OnCEbyS-iosxe.nasl

Version: 1.4

Type: local

Family: CISCO

Published: 2020/10/02

Updated: 2020/10/05

Dependencies: 67217

Risk Information

Risk Factor: High

VPR Score: 6.7

CVSS Score Source: CVE-2020-3417

CVSS v2.0

Base Score: 7.2

Temporal Score: 5.3

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

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

CVSS v3.0

Base Score: 6.7

Temporal Score: 5.8

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

Exploit Ease: No known exploits are available

Patch Publication Date: 2020/09/24

Vulnerability Publication Date: 2020/09/24

Reference Information

CVE: CVE-2020-3417

CISCO-BUG-ID: CSCvs58715

CISCO-SA: cisco-sa-xbace-OnCEbyS

IAVA: 2020-A-0439

CWE: 78