Security restrictions bypass in Cisco AsyncOS for Cisco Email Security Appliance

1) Security restrictions bypass

EUVDB-ID: #VU228

Risk: Low

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

CVE-ID: CVE-2016-1461

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass security controls on the target system.

The vulnerability exists due to improper application of message filtering rules to email attachments. A remote unauthenticated attacker can cause an ESA to fail to detect and act upon a specific type of file that is attached to an email message by sending an email message with a crafted attachment to an affected appliance.

Successful exploitation of this vulnerability may result in a host/resource access via network.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Cisco AsyncOS for Cisco Email Security Appliance: 9.0 - 10.0

CPE2.3

• cpe:2.3:a:cisco_systems:cisco_asyncos_for_cisco_email_security_appliance:9.0:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:cisco_asyncos_for_cisco_email_security_appliance:9.1:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:cisco_asyncos_for_cisco_email_security_appliance:9.1.1:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160727-esa

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.