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Cisco Web Security Appliance HTTPS Certificate Denial of Service Vulnerability

high Nessus Plugin ID 126646

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Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, Cisco Web Security Appliance (WSA) is affected by a denial of service vulnerability in the HTTPS decryption feature of WSA due to insufficient validation. An unauthenticated, remote attacker can exploit this, by installing a malformed certificate in a web server and sending a request to it through the Cisco WSA to cause a denial of service condition.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvo33747

See Also

http://www.nessus.org/u?cbe37f2b

Plugin Details

Severity: High

ID: 126646

File Name: cisco-sa-20190703-wsa-dos.nasl

Version: 1.6

Type: local

Family: CISCO

Published: 7/12/2019

Updated: 5/14/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2019-1886

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

Vulnerability Information

CPE: cpe:/h:cisco:web_security_appliance, cpe:/a:cisco:web_security_appliance, cpe:/o:cisco:web_security_appliance, cpe:/o:cisco:asyncos

Required KB Items: Host/AsyncOS/Cisco Web Security Appliance/DisplayVersion, Host/AsyncOS/Cisco Web Security Appliance/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 7/3/2019

Vulnerability Publication Date: 7/3/2019

Reference Information

CVE: CVE-2019-1886

BID: 109049

CISCO-SA: cisco-sa-20190703-wsa-dos

CISCO-BUG-ID: CSCvo33747