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Cisco Firepower Threat Defense Software TCP Intercept Bypass (cisco-sa-tcp-intercept-bypass-xG9M3PbY)

medium Nessus Plugin ID 152130

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Synopsis

The remote device is missing a vendor-supplied security patch (cisco-sa-tcp-intercept-bypass-xG9M3PbY)

Description

According to its self-reported version, Cisco Firepower Threat Defense Software is affected by a vulnerability in the TCP Intercept functionality of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured Access Control Policies (including Geolocation) and Service Polices on an affected system. The vulnerability exists because TCP Intercept is invoked when the embryonic connection limit is reached, which can cause the underlying detection engine to process the packet incorrectly. An attacker could exploit this vulnerability by sending a crafted stream of traffic that matches a policy on which TCP Intercept is configured. A successful exploit could allow the attacker to match on an incorrect policy, which could allow the traffic to be forwarded when it should be dropped. In addition, the traffic could incorrectly be dropped.

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 CSCvr53058

See Also

http://www.nessus.org/u?c7ab00f2

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvr53058

Plugin Details

Severity: Medium

ID: 152130

File Name: cisco-sa-tcp-intercept-bypass-xG9M3PbY.nasl

Version: 1.6

Type: local

Family: CISCO

Published: 7/28/2021

Updated: 3/31/2023

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.6

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

CVSS Score Source: CVE-2020-3565

CVSS v3

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 5.1

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

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

Vulnerability Information

CPE: cpe:/o:cisco:firepower_threat_defense, cpe:/a:cisco:firepower_threat_defense

Required KB Items: Settings/ParanoidReport, installed_sw/Cisco Firepower Threat Defense

Exploit Ease: No known exploits are available

Patch Publication Date: 10/21/2020

Vulnerability Publication Date: 10/21/2020

Reference Information

CVE: CVE-2020-3565

CISCO-SA: cisco-sa-tcp-intercept-bypass-xG9M3PbY

IAVA: 2020-A-0488-S

CISCO-BUG-ID: CSCvr53058