A vulnerability, which was classified as problematic, has been found in Fizz 2019.01.28.00. This issue affects an unknown functionality of the component Padding. The manipulation as part of a Handshake 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 peer could send empty handshake fragments containing only padding which would be kept in memory until a full handshake was received, resulting in memory exhaustion. This issue affects versions v2019.01.28.00 and above of fizz, until v2019.08.05.00.

The weakness was presented 08/20/2019 (Website). The advisory is shared at facebook.com. The identification of this vulnerability is CVE-2019-11924 since 05/13/2019. The exploitation is known to be easy. 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. MITRE ATT&CK project uses the attack technique T1499 for this issue.

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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• Fizz

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• 2019.01.28.00

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• open-source

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