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

Wed, 16 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00067}

epss

{'score': 0.00072}


Fri, 22 Nov 2024 12:00:00 +0000


Wed, 13 Nov 2024 02:45:00 +0000

Type Values Removed Values Added
First Time appeared Redhat
Redhat enterprise Linux
CPEs cpe:/a:redhat:enterprise_linux:9
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux

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:

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: 2024-11-21T09:43:11.753

Link: CVE-2024-4603

cve-icon Redhat

Severity : Low

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

Links: CVE-2024-4603 - Bugzilla

cve-icon OpenCVE Enrichment

No data.