Denial of service in Cisco Email Security Appliance

1) Resource exhaustion

EUVDB-ID: #VU8545

Risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-12215

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the email message filtering feature of Cisco AsyncOS Software for the Cisco Email Security Appliance improper validation of user-supplied input. A remote attacker can send a specially crafted email message with an attachment that contains corrupted fields, consume all available memory and cause the AsyncOS filtering process to crash and restart.

Successful exploitation of the vulnerability results in denial of service.

Mitigation

The vulnerability is addressed in the following versions: 10.0.2-020, 9.8.1-015.

Vulnerable software versions

Cisco Email Security Appliance: 9.7.1 066 - 10.0.1 087

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170920-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.