CVE-2023-3446

CVE Details

Release Date:

2023-07-19

Description

Issue summary: Checking excessively long DH keys or parameters may be very slow.\nImpact summary: Applications that use the functions DH_check(), DH_check_ex()\nor EVP_PKEY_param_check() to check a DH key or DH parameters may experience long\ndelays. Where the key or parameters that are being checked have been obtained\nfrom an untrusted source this may lead to a Denial of Service.\nThe function DH_check() performs various checks on DH parameters. One of those\nchecks confirms that the modulus ('p' parameter) is not too large. Trying to use\na very large modulus is slow and OpenSSL will not normally use a modulus which\nis over 10,000 bits in length.\nHowever the DH_check() function checks numerous aspects of the key or parameters\nthat have been supplied. Some of those checks use the supplied modulus value\neven if it has already been found to be too large.\nAn application that calls DH_check() and supplies a key or parameters obtained\nfrom an untrusted source could be vulernable to a Denial of Service attack.\nThe function DH_check() is itself called by a number of other OpenSSL functions.\nAn application calling any of those other functions may similarly be affected.\nThe other functions affected by this are DH_check_ex() and\nEVP_PKEY_param_check().\nAlso vulnerable are the OpenSSL dhparam and pkeyparam command line applications\nwhen using the '-check' option.\nThe OpenSSL SSL/TLS implementation is not affected by this issue.\nThe OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue.

See more information about CVE-2023-3446 from MITRE CVE dictionary and NIST NVD

CVSS v3.0 metrics

NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.

Base Score:	5.3	Base Metrics:	AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Access Vector:	Network	Attack Complexity:	Low
Privileges Required:	None	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	None
Integrity Impact:	None	Availability Impact:	Low

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (edk2)	ELSA-2024-0888	2024-02-20
Oracle Linux version 8 (openssl)	ELSA-2023-7877	2023-12-18
Oracle Linux version 8 (openssl)	ELSA-2024-12056	2024-01-10
Oracle Linux version 9 (edk2)	ELSA-2024-2264	2024-05-03
Oracle Linux version 9 (openssl)	ELSA-2024-2447	2024-05-03
Oracle Linux version 9 (openssl-fips-provider)	ELSA-2024-2447	2024-05-03

This page is generated automatically and has not been checked for errors or omissions. For clarification or corrections please contact the Oracle Linux ULN team