URL filtering bypass in Cisco Email Security Appliance



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-20057
CWE-ID CWE-254
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Cisco Email Security Appliance
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor Cisco Systems, Inc

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Security features bypass

EUVDB-ID: #VU71330

Risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-20057

CWE-ID: CWE-254 - Security Features

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass URL filtering.

The vulnerability exists due to improper processing of URLs. A remote attacker can bypass the URL reputation filters that are configured for an affected device, which could allow malicious URLs to pass through the device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Email Security Appliance: All versions

CPE2.3 External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-url-bypass-WbMQqNJh
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwb58117


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.



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