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Cisco IOS XR Software for ASR 9000 Series Aggregation Services Routers PPPoE DoS (cisco-sa-iosxr-pppma-JKWFgneW)

high Nessus Plugin ID 192235

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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 is affected by a vulnerability.

 - A vulnerability in the PPP over Ethernet (PPPoE) termination feature of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, adjacent attacker to crash the ppp_ma process, resulting in a denial of service (DoS) condition. This vulnerability is due to the improper handling of malformed PPPoE packets that are received on a router that is running Broadband Network Gateway (BNG) functionality with PPPoE termination on a Lightspeed-based or Lightspeed-Plus-based line card. An attacker could exploit this vulnerability by sending a crafted PPPoE packet to an affected line card interface that does not terminate PPPoE. A successful exploit could allow the attacker to crash the ppp_ma process, resulting in a DoS condition for PPPoE traffic across the router. (CVE-2024-20327)

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 CSCwf75789

See Also

http://www.nessus.org/u?21efcd75

http://www.nessus.org/u?3206828a

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwf75789

Plugin Details

Severity: High

ID: 192235

File Name: cisco-sa-iosxr-pppma-JKWFgneW-iosxr.nasl

Version: 1.0

Type: combined

Family: CISCO

Published: 3/19/2024

Updated: 3/19/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.5

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

CVSS Score Source: CVE-2024-20327

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.4

Vector: CVSS:3.0/AV:A/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/Model, Host/Cisco/IOS-XR/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 3/13/2024

Vulnerability Publication Date: 3/13/2024

Reference Information

CVE: CVE-2024-20327

CWE: 20

CISCO-SA: cisco-sa-iosxr-pppma-JKWFgneW

IAVA: 2024-A-0169

CISCO-BUG-ID: CSCwf75789