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CVE-2023-3817

Published: 31 July 2023

Issue summary: Checking excessively long DH keys or parameters may be very slow.
Impact summary: Applications that use the functions DH_check(), DH_check_ex() or
EVP_PKEY_param_check() to check a DH key or DH parameters may experience long
delays. Where the key or parameters that are being checked have been obtained
from an untrusted source this may lead to a Denial of Service. The function
DH_check() performs various checks on DH parameters. After fixing CVE-2023-3446
it was discovered that a large q parameter value can also trigger an overly long
computation during some of these checks. A correct q value, if present, cannot
be larger than the modulus p parameter, thus it is unnecessary to perform these
checks if q is larger than p. An application that calls DH_check() and supplies
a key or parameters obtained from an untrusted source could be vulnerable to a
Denial of Service attack. The function DH_check() is itself called by a number
of other OpenSSL functions. An application calling any of those other functions
may similarly be affected. The other functions affected by this are
DH_check_ex() and EVP_PKEY_param_check(). Also vulnerable are the OpenSSL
dhparam and pkeyparam command line applications when using the ”-check” option.
The OpenSSL SSL/TLS implementation is not affected by this issue. The OpenSSL
3.0 and 3.1 FIPS providers are not affected by this issue.


NOTES

Author Note

Priority reason:
Upstream rates this as having low severity


PRIORITY

Low


CVSS 3 SEVERITY SCORE

5.3

Score breakdown


STATUS

Package Release Status edk2
Launchpad, Ubuntu, Debian bionic Needs triage


focal Needed


jammy Needed


lunar Ignored

(end of life, was needs-triage)
mantic Ignored

(end of life, was needed)
noble Needed


trusty Ignored

(end of standard support)
upstream Needs triage


xenial Needs triage


nodejs
Launchpad, Ubuntu, Debian bionic Needs triage


focal Not vulnerable

(uses system openssl)
jammy Needed


lunar Not vulnerable

(uses system openssl)
mantic Not vulnerable

(uses system openssl)
noble Not vulnerable

(uses system openssl)
trusty Not vulnerable

(uses system openssl)
upstream Needs triage


xenial Needs triage


openssl
Launchpad, Ubuntu, Debian bionic

Released (1.1.1-1ubuntu2.1~18.04.23+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) focal

Released (1.1.1f-1ubuntu2.20)
jammy

Released (3.0.2-0ubuntu1.12)
lunar

Released (3.0.8-1ubuntu1.4)
mantic Not vulnerable

(3.0.10-1ubuntu2)
noble Not vulnerable

(3.0.10-1ubuntu2)
trusty Needs triage


upstream

Released (3.0.10)
xenial

Released (1.0.2g-1ubuntu4.20+esm10)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) openssl1.0
Launchpad, Ubuntu, Debian bionic

Released (1.0.2n-1ubuntu5.13+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) focal Does not exist


jammy Does not exist


lunar Does not exist


mantic Does not exist


noble Does not exist


trusty Does not exist


upstream Needed


xenial Does not exist




SEVERITY SCORE BREAKDOWN

Parameter Value Base score 5.3 Attack vector Network Attack complexity Low
Privileges required None User interaction None Scope Unchanged Confidentiality
None Integrity impact None Availability impact Low Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L


REFERENCES

 * https://www.openssl.org/news/secadv/20230731.txt
 * https://ubuntu.com/security/notices/USN-6435-1
 * https://ubuntu.com/security/notices/USN-6450-1
 * https://ubuntu.com/security/notices/USN-6435-2
 * https://ubuntu.com/security/notices/USN-6709-1
 * https://www.cve.org/CVERecord?id=CVE-2023-3817
 * NVD
 * Launchpad
 * Debian


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