#VU98050 Resource exhaustion in Diffie-Hellman key exchange - CVE-2024-41996

Vulnerability identifier: #VU98050

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-41996

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Diffie-Hellman key exchange
Universal components / Libraries / Software for developers

Vendor: Diffie-Hellman key exchange

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to unnecessary validation of the public keys in the Diffie-Hellman Key Agreement Protocol when an approved safe prime is used. A remote attacker from the client side can trigger unnecessarily expensive server-side DHE modular-exponentiation calculations and cause asymmetric resource consumption, resulting in a denial of service (DoS) attack.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Diffie-Hellman key exchange: All versions

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External links
http://gist.github.com/c0r0n3r/abccc14d4d96c0442f3a77fa5ca255d1
http://dheatattack.gitlab.io/details/
http://dheatattack.gitlab.io/faq/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.