Cisco Web Security Appliance (WSA) GUI Denial of Service Vulnerability

medium Nessus Plugin ID 134446

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Synopsis

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

Description

According to its self-reported version, the Cisco Web Security Appliance is affected by a Denial of Service vulnerability. The vulnerability is due to improper validation of specific HTTP request headers. An attacker could exploit this vulnerability by sending a malformed HTTP request to an affected device. A successful exploit could allow the attacker to trigger a prolonged status of high CPU utilization relative to the GUI process(es).

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

Solution

Upgrade to the relevant fixed version referenced in Cisco Security Advisory cisco-sa-cont-sec-gui-dos-nJ625dXb.

Plugin Details

Severity: Medium

ID: 134446

File Name: cisco-sa-wsa-dos-nJ625dXb.nasl

Version: 1.8

Type: local

Family: CISCO

Published: 3/13/2020

Updated: 5/14/2021

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:N/A:P

CVSS Score Source: CVE-2020-3164

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:N/A:L

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: 3/4/2020

Vulnerability Publication Date: 3/4/2020

Reference Information

CVE: CVE-2020-3164

CISCO-SA: cisco-sa-cont-sec-gui-dos-nJ625dXb

IAVA: 2020-A-0100

CISCO-BUG-ID: CSCvq96943, CSCvs33296, CSCvs33306

Detections

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