Cisco cBR Series Converged Broadband Routers High CPU Usage DoS (cisco-sa-20180418-cbr8)

medium Nessus Plugin ID 132043

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Synopsis

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

Description

According to its self-reported version, Cisco IOS XE Software is affected by a denial of service (DoS) vulnerability on Cisco cBR Series Converged Broadband Routers due to incorrect handling of certain DHCP packets. An unauthenticated, adjacent, attacker can exploit this, by sending certain DHCP packets to a specific segment of an affected device in order to increase CPU usage and cause a DoS condition.

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(s) CSCvg73687.

Plugin Details

Severity: Medium

ID: 132043

File Name: cisco-sa-20180418-cbr8.nasl

Version: 1.7

Type: combined

Family: CISCO

Published: 12/13/2019

Updated: 5/3/2024

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.4

CVSS v2

Risk Factor: Low

Base Score: 3.3

Temporal Score: 2.4

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

CVSS Score Source: CVE-2018-0257

CVSS v3

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.8

Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/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_xe

Required KB Items: Settings/ParanoidReport, Host/Cisco/IOS-XE/Version, Host/Cisco/IOS-XE/Model

Exploit Ease: No known exploits are available

Patch Publication Date: 4/18/2018

Vulnerability Publication Date: 4/19/2018

Reference Information

CVE: CVE-2018-0257

BID: 103948

CISCO-SA: cisco-sa-20180418-cbr8

CISCO-BUG-ID: CSCvg73687

Detections

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