CVE-2022-40735: diffie-hellman_key_exchange_project diffie-hellman_key_exchange Uncontrolled Resource Consumption

Vulnerability summary

CVE-2022-40735 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in diffie-hellman_key_exchange_project diffie-hellman_key_exchange. EPSS estimates a 2.63% chance of exploitation in the next 30 days, higher than 85.5% of scored vulnerabilities.

Timeline

1. 14-11-2022
   PublishedVulnerability first disclosed.
2. 03-08-2024
   Last modifiedVulnerability information updated.

Description

The Diffie-Hellman Key Agreement Protocol allows use of long exponents that arguably make certain calculations unnecessarily expensive, because the 1996 van Oorschot and Wiener paper found that "(appropriately) short exponents" can be used when there are adequate subgroup constraints, and these short exponents can lead to less expensive calculations than for long exponents. This issue is different from CVE-2002-20001 because it is based on an observation about exponent size, rather than an observation about numbers that are not public keys. The specific situations in which calculation expense would constitute a server-side vulnerability depend on the protocol (e.g., TLS, SSH, or IKE) and the DHE implementation details. In general, there might be an availability concern because of server-side resource consumption from DHE modular-exponentiation calculations. Finally, it is possible for an attacker to exploit this vulnerability and CVE-2002-20001 together.

• CWE-400Uncontrolled Resource ConsumptionThe product does not properly control the allocation and maintenance of a limited resource.