Denial of service in Diffie-Hellman Key Agreement Protocol implementation

1) Resource exhaustion

EUVDB-ID: #VU98050

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-41996

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:diffie-hellman_key_exchange:diffie-hellman_key_exchange:*:*:*:*:*:*:*:*

External links

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

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.