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Cisco IOS XR Software for ASR 9000 Series Slow Path Forwarding DoS (cisco-sa-xr-cp-dos-ej8VB9QY)

high Nessus Plugin ID 142890

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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 denial of service (DoS) vulnerability in the ingress packet processing function due to improper resource allocation when processing network traffic in software switching mode (punted). An unauthenticated, remote attacker can exploit this, by sending specific streams of Layer 2 or Layer 3 protocol data units (PDUs) to an affected device, in order to cause a DoS condition on 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 CSCvv09115

See Also

http://www.nessus.org/u?dd73ce5d

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvv09115

Plugin Details

Severity: High

ID: 142890

File Name: cisco-sa-xr-cp-dos-ej8VB9QY-iosxr.nasl

Version: 1.13

Type: combined

Family: CISCO

Published: 11/13/2020

Updated: 9/10/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

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-2020-26070

CVSS v3

Risk Factor: High

Base Score: 8.6

Temporal Score: 7.5

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

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: 11/10/2020

Vulnerability Publication Date: 11/10/2020

Reference Information

CVE: CVE-2020-26070

CISCO-SA: cisco-sa-xr-cp-dos-ej8VB9QY

IAVA: 2020-A-0526-S

CISCO-BUG-ID: CSCvv09115