Cisco Email Security Appliance Content Filter Email Message input validation

Summaryinfo

A vulnerability, which was classified as critical, was found in Cisco Email Security Appliance. The affected element is an unknown function of the component Content Filter. The manipulation as part of Email Message results in input validation. This vulnerability is reported as CVE-2020-3133. The attack can be launched remotely. No exploit exists. 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 classified as critical. Affected is some unknown functionality of the component Content Filter. The manipulation as part of a Email Message leads to a input validation vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A vulnerability in the email message scanning of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass configured filters on the device. The vulnerability is due to improper validation of incoming emails. An attacker could exploit this vulnerability by sending a crafted email message to a recipient protected by the ESA. A successful exploit could allow the attacker to bypass the configured content filters, which could allow malicious content to pass through the device.

The weakness was disclosed 09/23/2020 as cisco-sa-esa-bypass-5Cdv2HMA as confirmed advisory (Website). The advisory is shared for download at tools.cisco.com. This vulnerability is traded as CVE-2020-3133 since 12/12/2019. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (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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