Cisco IOS-XE Zone-Based Firewall Feature Security Bypass (CSCun96847)

medium Nessus Plugin ID 91855
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

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

Description

According to its self-reported version, the Cisco IOS-XE software running on the remote device is affected by a security bypass vulnerability in the Zone-Based Firewall feature due to insufficient zone checking for traffic belonging to existing sessions. An unauthenticated, remote attacker can exploit this, by injecting spoofed traffic that matches existing connections, to bypass security access restrictions on the device and gain access to resources.

Solution

Apply the relevant patch referenced in the Cisco security advisory.
Alternatively, disable the Zone-Based Firewall feature according to the vendor advisory

See Also

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCun96847

https://tools.cisco.com/security/center/viewAlert.x?alertId=39129

Plugin Details

Severity: Medium

ID: 91855

File Name: cisco-CSCun96847-iosxe.nasl

Version: 1.8

Type: local

Family: CISCO

Published: 6/27/2016

Updated: 11/19/2019

Dependencies: cisco_ios_xe_version.nasl

Risk Information

CVSS Score Source: CVE-2014-2146

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

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

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*

Required KB Items: Host/Cisco/IOS-XE/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 5/29/2015

Vulnerability Publication Date: 5/29/2015

Reference Information

CVE: CVE-2014-2146

CISCO-BUG-ID: CSCun96847