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Cisco Web Security Appliance Malformed Request Denial of Service Vulnerability

high Nessus Plugin ID 126632

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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 (DoS) vulnerability due to improper validation of HTTP / HTTPS requests. An unauthenticated, remote attacker can exploit this issue, by sending malformed requests, to cause the application to temporarily stop responding.

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

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvn31450

See Also

http://www.nessus.org/u?ed846d6a

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvn31450

Plugin Details

Severity: High

ID: 126632

File Name: cisco-sa-20190501-wsa-dos.nasl

Version: 1.11

Type: local

Family: CISCO

Published: 7/12/2019

Updated: 5/14/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

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-2019-1817

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/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: 5/1/2019

Vulnerability Publication Date: 5/1/2019

Reference Information

CVE: CVE-2019-1817

CWE: 20

CISCO-SA: cisco-sa-20190501-wsa-dos

CISCO-BUG-ID: CSCvn31450