Cisco IOS XR Software Broadband Network Gateway PPP over Ethernet DoS (cisco-sa-iosxr-bng-Gmg5Gxt)

medium Nessus Plugin ID 165215

Synopsis

The remote device is missing a vendor-supplied security patch

Description

A denial of service (DoS) vulnerability exists in IOS XR Software due to the PPPoE feature not properly handling an error condition within a specific crafted packet sequence. An unauthenticated, adjacent attacker can exploit this issue, via a sequence of specific PPPoE packets from controlled customer premises equipment (CPE), to cause the process to continuously restart.

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 number.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwa57311

See Also

http://www.nessus.org/u?7e145bee

https://tools.cisco.com/security/center/viewErp.x?alertId=ERP-74840

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwa57311

Plugin Details

Severity: Medium

ID: 165215

File Name: cisco-sa-iosxr-bng-Gmg5Gxt-iosxr.nasl

Version: 1.5

Type: combined

Family: CISCO

Published: 9/16/2022

Updated: 9/19/2022

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS Score Source: CVE-2022-20849

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.3

Vector: CVSS:3.0/AV:A/AC:H/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:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/14/2022

Vulnerability Publication Date: 9/14/2022

Reference Information

CVE: CVE-2022-20849

CWE: 391

IAVA: 2022-A-0380

CISCO-BUG-ID: CSCwa57311

CISCO-SA: cisco-sa-iosxr-bng-Gmg5Gxt