Cisco IOS XE Software Digital Signature Verification Bypass (cisco-sa-iosxe-digsig-bypass-FYQ3bmVq)

medium Nessus Plugin ID 137148

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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 vulnerability due to an improper check on the area of code that manages the verification of the digital signatures of system image files during the initial boot process. An attacker could exploit this vulnerability by loading unsigned software on an affected device. A successful exploit could allow the attacker to install and boot a malicious software image or execute unsigned binaries on the targeted 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 IDs CSCvk61152, CSCvp77508

Plugin Details

Severity: Medium

ID: 137148

File Name: cisco-sa-iosxe-digsig-bypass-FYQ3bmVq-iosxe.nasl

Version: 1.13

Type: combined

Family: CISCO

Published: 6/5/2020

Updated: 5/3/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2020-3209

CVSS v3

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

Vector: CVSS:3.0/AV:P/AC:L/PR:N/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: 6/3/2020

Vulnerability Publication Date: 6/3/2020

Reference Information

CVE: CVE-2020-3209

CWE: 347

CISCO-SA: cisco-sa-iosxe-digsig-bypass-FYQ3bmVq

IAVA: 2020-A-0239-S

CISCO-BUG-ID: CSCvk61152, CSCvp77508

Detections

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