A vulnerability was found in Cisco Email Security Appliance (Anti-Malware Software) (unknown version). It has been declared as critical. This vulnerability affects an unknown code block of the component Email Message Scanner. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect 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 content filters on the device. The vulnerability is due to improper input validation of the email body. An attacker could exploit this vulnerability by inserting specific character strings in the message. A successful exploit could allow the attacker to bypass configured content filters that would normally drop the email.

The bug was discovered 04/17/2019. The weakness was published 04/18/2019 as cisco-sa-20190417-esa-filter-b as confirmed advisory (Website). The advisory is available at tools.cisco.com. This vulnerability was named CVE-2019-1831 since 12/06/2018. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 09/04/2023).

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316413 (Cisco Email Security Appliance Content Filter Bypass Vulnerability(cisco-sa-20190417-esa-filter-bypass)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Type

• Anti-Malware Software

Vendor

• Cisco

Name

• Email Security Appliance

License

• commercial

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