Cisco IOS XR BGP Additional Paths DoS (cisco-sa-bgp-ErKEqAer)

medium Nessus Plugin ID 139577

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Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, Cisco IOS XR Software is affected by a denial of service (DoS) vulnerability in its Border Gateway Protocol (BGP) feature due to an incorrect calculation of lexicographical order when displaying additional path information. An unauthenticated, remote attacker can exploit this issue, by sending a specific BGP update from a BGP neighbour session, to cause a DoS condition on the feature.

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 CSCvu54677

Plugin Details

Severity: Medium

ID: 139577

File Name: cisco-sa-bgp-ErKEqAer.nasl

Version: 1.12

Type: combined

Family: CISCO

Published: 8/14/2020

Updated: 9/10/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.4

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

CVSS Score Source: CVE-2020-3449

CVSS v3

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.8

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:ios_xr

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/5/2020

Vulnerability Publication Date: 8/5/2020

Reference Information

CVE: CVE-2020-3449

CWE: 754

CISCO-SA: cisco-sa-bgp-ErKEqAer

IAVA: 2020-A-0374-S

CISCO-BUG-ID: CSCvu54677

Detections

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