Cisco Firepower Threat Defense Software SSL/TLS Session DoS (cisco-sa-asa-ftd-tcp-dos-N3DMnU4T)

high Nessus Plugin ID 149313
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Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, the SSL/TLS session handler of Cisco Firepower Threat Defense (FTD) Software is affected by denial of service vulnerability due to a memory leak when closing SSL/TLS connections in a specific state. An unauthenticated, remote attacker can exploit this by establishing several SSL/TLS sessions and ensuring they are closed under certain conditions. A successful exploit could allow the attacker to exhaust memory resources in the affected device, which would prevent it from processing new SSL/TLS connections, resulting in a DoS. Manual intervention is required to recover an affected device.

Please see the included Cisco BID 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 CSCvu46685

See Also

http://www.nessus.org/u?574e4ada

http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-74302

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvu46685

Plugin Details

Severity: High

ID: 149313

File Name: cisco-sa-asa-ftd-tcp-dos-N3DMnU4T-ftd.nasl

Version: 1.6

Type: local

Family: CISCO

Published: 5/6/2021

Updated: 5/20/2021

Dependencies: cisco_enumerate_firepower.nbin

Risk Information

CVSS Score Source: CVE-2020-3572

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

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

CVSS v3

Risk Factor: High

Base Score: 8.6

Temporal Score: 7.5

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

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

Vulnerability Information

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

Required KB Items: 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-2020-3572

IAVA: 2020-A-0488

CISCO-BUG-ID: CSCvu46685

CISCO-SA: cisco-sa-asa-ftd-tcp-dos-N3DMnU4T

CWE: 400