CVE-2023-3817
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.
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 |
NVD | CVSSv3 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |