PT-2023-4551 · Openssl+11 · Openssl+11
Matt Caswell
+2
·
Published
2023-07-13
·
Updated
2025-11-28
·
CVE-2023-3446
CVSS v3.1
5.3
Medium
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
Name of the Vulnerable Software and Affected Versions
OpenSSL versions prior to 41.0.3
Description
The issue is related to the functions
DH check(), DH check ex(), and EVP PKEY param check() in the OpenSSL library. These functions can cause long delays when checking excessively long DH keys or parameters, potentially leading to a Denial of Service (DoS) attack if the key or parameters are obtained from an untrusted source. The DH check() function performs various checks on DH parameters, including confirming that the modulus (p parameter) is not too large. However, trying to use a very large modulus is slow, and OpenSSL will not normally use a modulus over 10,000 bits in length. The OpenSSL SSL/TLS implementation and the OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue.Recommendations
To resolve the issue, update to OpenSSL version 41.0.3 or later.
As a temporary workaround, consider restricting the use of the
DH check(), DH check ex(), and EVP PKEY param check() functions to minimize the risk of exploitation.
Avoid using the p parameter with large modulus values in the affected functions until the issue is resolved.Fix
DoS
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Related Identifiers
Affected Products
Alt Linux
Almalinux
Astra Linux
Centos
Ibm Aix
Linuxmint
Openssl
Red Hat
Red Os
Rocky Linux
Suse
Ubuntu