Filter bypass vulnerability in Cisco Web Security Appliance

1) Security features bypass

EUVDB-ID: #VU61940

Risk: Medium

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-20784

CWE-ID: CWE-254 - Security Features

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to blocked content.

The vulnerability exists due to improper input validation in the Web-Based Reputation Score (WBRS) engine of Cisco AsyncOS Software for Cisco Web Security Appliance (WSA). A remote non-authenticated attacker can bypass established web request policies and access blocked content on an affected device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Web Security Appliance: 11.7 - 14.0.1

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-swa-filter-bypass-XXXTU3X
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCvx78607

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.