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F5 Networks: K83120834: Diffie-Hellman key agreement protocol weaknesses CVE-2002-20001 CVE-2022-40735

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F5 Networks: K83120834: Diffie-Hellman key agreement protocol weaknesses CVE-2002-20001 CVE-2022-40735

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
11/11/2021
Created
05/21/2022
Added
05/20/2022
Modified
12/08/2023

Description

The Diffie-Hellman Key Agreement Protocol allows remote attackers (from the client side) to send arbitrary numbers that are actually not public keys, and trigger expensive server-side DHE modular-exponentiation calculations, aka a D(HE)at or D(HE)ater attack. The client needs very little CPU resources and network bandwidth. The attack may be more disruptive in cases where a client can require a server to select its largest supported key size. The basic attack scenario is that the client must claim that it can only communicate with DHE, and the server must be configured to allow DHE.

Solution(s)

  • f5-big-ip-upgrade-latest

References

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