Denial of service in Cisco Email Security Appliance

1) Denial of service

EUVDB-ID: #VU1080

Risk: Low

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-1481

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote unauthenticated user to cause memory exhaustion on the target system.
The weakness is due to insufficient validation if input data. By sending email message with a specially crafted Design (DGN) file attachment, attackers can consume excessive memory during message filtering, causing the process to restart.
Successful exploitation of the vulnerability may lead to denial of service on the vulnerable system.

Mitigation

Update to version 9.1.1-038, 9.7.1-066, 10.0.0-124.

Vulnerable software versions

Cisco Email Security Appliance: 8.0 - 8.5

Cisco AsyncOS for Cisco Email Security Appliance: 9.0 - 10.0

CPE2.3

• cpe:2.3:a:cisco_systems:cisco_email_security_appliance:8.0:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:cisco_email_security_appliance:8.5:*:*:*:*:*:*:*
• 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:9.5:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161026-esa1

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.