CVE-2023-3817: Excessive time spent checking DH q parameter value
Vendor fix available · Affected: OpenSSL · Exploitation: possible (1 to 10%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 87% of scored CVEs
DescriptionCVE.org
Issue summary: Checking excessively long DH keys or parameters may be very slow. 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 products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- OpenSSL · OpenSSLfrom 3.1.0 before 3.1.2; from 3.0.0 before 3.0.10; from 1.1.1 before 1.1.1v; from 1.0.2 before 1.0.2zi
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CoverageNo articles yet
No CyberSIXT article names CVE-2023-3817 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.
References
- NVD entrynvd.nist.gov
- CVE recordcve.org
- Weakness CWE-606cwe.mitre.org
- Vendor advisoryopenssl.org
- Patchgit.openssl.org
- Patchgit.openssl.org
- Patchgit.openssl.org
- Patchgit.openssl.org
- seclists.org/fulldisclosure/2023/Jul/43seclists.org
- openwall.com/lists/oss-security/2023/07/31/1openwall.com
- lists.debian.org/debian-lts-announce/2023/08/msg00019.htmllists.debian.org
- security.netapp.com/advisory/ntap-20230818-0014security.netapp.com
- openwall.com/lists/oss-security/2023/09/22/9openwall.com
- openwall.com/lists/oss-security/2023/09/22/11openwall.com
- security.netapp.com/advisory/ntap-20231027-0008security.netapp.com
7 more references are in the CVE record.