CVE-2022-40735
Published: 14 November 2022
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.
Notes
| Author | Note |
|---|---|
| alexmurray | It would appear upstream openssl fixed this in 3.1.0 via https://github.com/openssl/openssl/pull/18480 |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
openssl Launchpad, Ubuntu, Debian |
kinetic |
Ignored
(end of life, was needs-triage)
|
| focal |
Needs triage
|
|
| jammy |
Needs triage
|
|
| lunar |
Needs triage
|
|
| trusty |
Needs triage
|
|
| upstream |
Needs triage
|
|
| xenial |
Needs triage
|
|
| bionic |
Needs triage
|
|
|
openssl1.0 Launchpad, Ubuntu, Debian |
bionic |
Needs triage
|
| focal |
Does not exist
|
|
| jammy |
Does not exist
|
|
| kinetic |
Does not exist
|
|
| lunar |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Does not exist
|
|
|
nodejs Launchpad, Ubuntu, Debian |
trusty |
Not vulnerable
(uses system openssl)
|
| xenial |
Needs triage
|
|
| bionic |
Needs triage
|
|
| focal |
Not vulnerable
(uses system openssl)
|
|
| jammy |
Needed
|
|
| kinetic |
Not vulnerable
(uses system openssl)
|
|
| lunar |
Not vulnerable
(uses system openssl)
|
|
| upstream |
Needs triage
|
|
|
edk2 Launchpad, Ubuntu, Debian |
trusty |
Ignored
(end of standard support)
|
| xenial |
Deferred
|
|
| bionic |
Deferred
|
|
| focal |
Deferred
|
|
| jammy |
Deferred
|
|
| kinetic |
Ignored
(end of life, was needs-triage)
|
|
| lunar |
Deferred
|
|
| upstream |
Needs triage
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-40735
- https://github.com/mozilla/ssl-config-generator/issues/162
- https://link.springer.com/content/pdf/10.1007/3-540-68339-9_29.pdf
- https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-57pt1r5.pdf
- https://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
- https://gist.github.com/c0r0n3r/9455ddcab985c50fd1912eabf26e058b
- https://www.rfc-editor.org/rfc/rfc4419
- https://www.rfc-editor.org/rfc/rfc7919#section-5.2
- https://www.rfc-editor.org/rfc/rfc3526
- https://raw.githubusercontent.com/CVEProject/cvelist/9d7fbbcabd3f44cfedc9e8807757d31ece85a2c6/2022/40xxx/CVE-2022-40735.json
- https://www.rfc-editor.org/rfc/rfc5114#section-4
- https://github.com/openssl/openssl/pull/18480
- NVD
- Launchpad
- Debian