Cisco Email Security Appliance Email Message Filter input validation

Summaryinfo

A vulnerability identified as problematic has been detected in Cisco Email Security Appliance. Affected is an unknown function of the component Email Message Filter. The manipulation leads to input validation. This vulnerability is referenced as CVE-2019-1947. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Cisco Email Security Appliance (Anti-Malware Software) (affected version not known). It has been rated as problematic. This issue affects some unknown functionality of the component Email Message Filter. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. The summary by CVE is:

A vulnerability in the email message filtering feature of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to cause the CPU utilization to increase to 100 percent, causing a denial of service (DoS) condition on an affected device. The vulnerability is due to improper handling of email messages that contain large attachments. An attacker could exploit this vulnerability by sending a malicious email message through the targeted device. A successful exploit could allow the attacker to cause a permanent DoS condition due to high CPU utilization. This vulnerability may require manual intervention to recover the ESA.

The weakness was published 09/23/2020 as cisco-sa-20200219-esa-dos as confirmed advisory (Website). The advisory is shared at tools.cisco.com. The identification of this vulnerability is CVE-2019-1947 since 12/06/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/23/2020).

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Anti-Malware Software

Vendor

• Cisco

Name

• Email Security Appliance

License

• commercial

Website

• Vendor: https://www.cisco.com/

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