Security Bypass in Cisco AsyncOS Software for Cisco Email Security Appliance



Published: 2020-06-18
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-3368
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Cisco AsyncOS for 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) Input validation error

EUVDB-ID: #VU29147

Risk: Medium

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-3368

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass the URL reputation filters on an affected device.

The vulnerability exists due to insufficient validation of user-supplied input in the antispam protection mechanisms. A remote attacker can craft the URL in a particular way and bypass the URL reputation filters that are configured for the affected device, which could allow malicious URLs to pass through the device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco AsyncOS for Cisco Email Security Appliance: 12.1 089 - 12.5.0 066


CPE2.3 External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-url-bypass-WO4BZ75s

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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