Cisco Email Security Appliance Email Message Scanner resource consumption

Summaryinfo

A vulnerability classified as problematic has been found in Cisco Email Security Appliance. Affected by this vulnerability is an unknown functionality of the component Email Message Scanner. The manipulation leads to resource consumption. This vulnerability is traded as CVE-2020-3132. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Cisco Email Security Appliance (Anti-Malware Software) (version now known) and classified as problematic. This issue affects some unknown processing of the component Email Message Scanner. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

A vulnerability in the email message scanning feature of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to cause a temporary denial of service (DoS) condition on an affected device. The vulnerability is due to inadequate parsing mechanisms for specific email body components. An attacker could exploit this vulnerability by sending a malicious email containing a high number of shortened URLs through an affected device. A successful exploit could allow the attacker to consume processing resources, causing a DoS condition on an affected device. To successfully exploit this vulnerability, certain conditions beyond the control of the attacker must occur.

The weakness was shared 02/19/2020 as cisco-sa-esa-shrt-dos-wM54R8qA as confirmed advisory (Website). It is possible to read the advisory at tools.cisco.com. The identification of this vulnerability is CVE-2020-3132 since 12/12/2019. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

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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