Issue summary: Checking excessively long DSA keys or parameters may be very slow. Impact summary: Applications that use the functions EVP_PKEY_param_check() or EVP_PKEY_public_check() to check a DSA public key or DSA 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 functions EVP_PKEY_param_check() or EVP_PKEY_public_check() perform various checks on DSA parameters. Some of those computations take a long time if the modulus (`p` parameter) is too large. Trying to use a very large modulus is slow and OpenSSL will not allow using public keys with a modulus which is over 10,000 bits in length for signature verification. However the key and parameter check functions do not limit the modulus size when performing the checks. An application that calls EVP_PKEY_param_check() or EVP_PKEY_public_check() and supplies a key or parameters obtained from an untrusted source could be vulnerable to a Denial of Service attack. These functions are not called by OpenSSL itself on untrusted DSA keys so only applications that directly call these functions may be vulnerable. Also vulnerable are the OpenSSL pkey 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 affected by this issue.
History

Mon, 14 Oct 2024 15:45:00 +0000


Mon, 14 Oct 2024 15:15:00 +0000

Type Values Removed Values Added
First Time appeared Openssl
Openssl openssl
CPEs cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
Vendors & Products Openssl
Openssl openssl
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 14 Oct 2024 15:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-606

Tue, 13 Aug 2024 17:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-834

cve-icon MITRE

Status: PUBLISHED

Assigner: openssl

Published: 2024-05-16T15:21:20.050Z

Updated: 2024-10-14T14:56:01.784Z

Reserved: 2024-05-07T11:44:02.196Z

Link: CVE-2024-4603

cve-icon Vulnrichment

Updated: 2024-08-01T20:47:41.528Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2024-05-16T16:15:10.643

Modified: 2024-10-14T15:15:14.210

Link: CVE-2024-4603

cve-icon Redhat

Severity : Low

Publid Date: 2024-05-16T00:00:00Z

Links: CVE-2024-4603 - Bugzilla