Cisco IOS XR RCE (cisco-sa-iosxr-pxe-unsign-code-exec-qAa78fD2)

critical Nessus Plugin ID 142592

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Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, IOS-XR is affected by a remote code execution vulnerability in the enhanced Preboot eXecution Environment (PXE) boot loader due to a failure to verify commands issued during a network boot. An unauthenticated, remote attacker can exploit this to execute unsigned code on an affected device.

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

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version

Solution

Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvi82550, CSCvq23340, CSCvq31064, CSCvu31574

Plugin Details

Severity: Critical

ID: 142592

File Name: cisco-sa-iosxr-pxe-unsign-code-exec-qAa78fD2-iosxr.nasl

Version: 1.12

Type: combined

Family: CISCO

Published: 11/6/2020

Updated: 9/10/2021

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 9.3

Temporal Score: 6.9

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

CVSS Score Source: CVE-2020-3284

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/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_xr

Required KB Items: Settings/ParanoidReport, Host/Cisco/IOS-XR/Version, Host/Cisco/IOS-XR/Model

Exploit Ease: No known exploits are available

Patch Publication Date: 11/4/2020

Vulnerability Publication Date: 11/4/2020

Reference Information

CVE: CVE-2020-3284

CWE: 284

CISCO-SA: cisco-sa-iosxr-pxe-unsign-code-exec-qAa78fD2

IAVA: 2020-A-0503-S

CISCO-BUG-ID: CSCvi82550, CSCvq23340, CSCvq31064, CSCvu31574

Detections

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