#VU77321 Resource exhaustion in Diffie-Hellman key exchange - CVE-2022-40735

Vulnerability identifier: #VU77321

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-2022-40735

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 usage of unnecessarily expensive calculations. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Diffie-Hellman key exchange: All versions

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External links
http://github.com/mozilla/ssl-config-generator/issues/162
http://link.springer.com/content/pdf/10.1007/3-540-68339-9_29.pdf
http://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-57pt1r5.pdf
http://www.researchgate.net/profile/Anton-Stiglic-2/publication/2401745_Security_Issues_in_the_Diffie-Hellman_Key_Agreement_Protocol/links/546c144f0cf20dedafd53e7e/Security-Issues-in-the-Diffie-Hellman-Key-Agreement-Protocol.pdf
http://gist.github.com/c0r0n3r/9455ddcab985c50fd1912eabf26e058b
http://www.rfc-editor.org/rfc/rfc4419
http://www.rfc-editor.org/rfc/rfc7919#section-5.2
http://www.rfc-editor.org/rfc/rfc3526
http://raw.githubusercontent.com/CVEProject/cvelist/9d7fbbcabd3f44cfedc9e8807757d31ece85a2c6/2022/40xxx/CVE-2022-40735.json
http://www.rfc-editor.org/rfc/rfc5114#section-4

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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.