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Cisco IOS XE Software MP BGP EVPN DoS (cisco-sa-ios-bgp-evpn-dos-LNfYJxfF)

high Nessus Plugin ID 141230

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Synopsis

The remote device is missing a vendor-supplied security patch.

Description

According to its self-reported version, IOS-XE is affected by a denial of service (DoS) vulnerability in the Multiprotocol Border Gateway Protocol (MP-BGP) for the Layer 2 VPN (L2VPN) Ethernet VPN (EVPN) address family. An unauthenticated, remote attacker can exploit this, by sending BGP update messages with specific, malformed attributes to an affected device, to cause the device to crash.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvr81264 and CSCvr83128.

See Also

http://www.nessus.org/u?90954329

Plugin Details

Severity: High

ID: 141230

File Name: cisco-sa-ios-bgp-evpn-dos-LNfYJxfF-iosxe.nasl

Version: 1.11

Type: combined

Family: CISCO

Published: 10/7/2020

Updated: 5/3/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2020-3479

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/24/2020

Vulnerability Publication Date: 9/24/2020

Reference Information

CVE: CVE-2020-3479

CWE: 20

CISCO-SA: cisco-sa-ios-bgp-evpn-dos-LNfYJxfF

IAVA: 2020-A-0439-S

CISCO-BUG-ID: CSCvr81264, CSCvr83128