Public on 2023-07-31
Modified on 2023-09-26
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

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.
Medium severity
CVSS v3 Base Score
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
Amazon Linux 2 - Core edk2 2023-08-17 ALAS2-2023-2205 Fixed
Amazon Linux 2 - Core edk2 2024-03-13 ALAS2-2024-2502 Fixed
Amazon Linux 1 openssl 2023-09-27 ALAS-2023-1843 Fixed
Amazon Linux 2 - Core openssl 2023-09-08 ALAS2-2023-2246 Fixed
Amazon Linux 2023 openssl 2023-08-17 ALAS2023-2023-306 Fixed
Amazon Linux 2 - Openssl-snapsafe Extra openssl-snapsafe 2023-09-27 ALAS2OPENSSL-SNAPSAFE-2023-003 Fixed
Amazon Linux 2 - Core openssl11 2023-08-31 ALAS2-2023-2226 Fixed

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N