Cisco IOS XE Products Snort Application Detection Engine Policy Bypass (cisco-sa-snort-app-bypass-cSBYCATq)

medium Nessus Plugin ID 146211

Synopsis

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

Description

According to its self-reported version, Cisco IOS XE is affected by a vulnerability in the UTD SNORT IPS detection engine due to a flaw in the detection algorithm. An unauthenticated, remote attacker can exploit this by sending crafted packets that would flow through an affected system. A successful exploit could allow the attacker to bypass the configured policies and deliver a malicious payload to the protected network.

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvu21318

See Also

http://www.nessus.org/u?e5c32102

Plugin Details

Severity: Medium

ID: 146211

File Name: cisco-sa-snort-app-bypass-cSBYCATq-iosxe.nasl

Version: 1.7

Type: combined

Family: CISCO

Published: 2/5/2021

Updated: 5/3/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2021-1236

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

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

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, Host/Cisco/IOS-XE/Model

Exploit Ease: No known exploits are available

Patch Publication Date: 1/13/2021

Vulnerability Publication Date: 2/2/2021

Reference Information

CVE: CVE-2021-1236

CWE: 670

CISCO-SA: cisco-sa-snort-app-bypass-cSBYCATq

IAVA: 2021-A-0026-S

CISCO-BUG-ID: CSCvu21318