ghsa-c945-cqj5-wfv6
Vulnerability from github
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": [], "aliases": [ "CVE-2023-3817" ], "database_specific": { "cwe_ids": [ "CWE-606", "CWE-834" ], "github_reviewed": false, "github_reviewed_at": null, "nvd_published_at": "2023-07-31T16:15:10Z", "severity": "MODERATE" }, "details": "Issue summary: Checking excessively long DH keys or parameters may be very slow.\n\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.\n\nThe function DH_check() performs various checks on DH parameters. After fixing\nCVE-2023-3446 it was discovered that a large q parameter value can also trigger\nan overly long computation during some of these checks. A correct q value,\nif present, cannot be larger than the modulus p parameter, thus it is\nunnecessary to perform these checks if q is larger than p.\n\nAn application that calls DH_check() and supplies a key or parameters obtained\nfrom an untrusted source could be vulnerable to a Denial of Service attack.\n\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().\n\nAlso vulnerable are the OpenSSL dhparam and pkeyparam command line applications\nwhen using the \"-check\" option.\n\nThe OpenSSL SSL/TLS implementation is not affected by this issue.\n\nThe OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue.", "id": "GHSA-c945-cqj5-wfv6", "modified": "2024-06-21T21:33:53Z", "published": "2023-07-31T18:30:22Z", "references": [ { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-3817" }, { "type": "WEB", "url": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a1eb62c29db6cb5eec707f9338aee00f44e26f5" }, { "type": "WEB", "url": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=869ad69aadd985c7b8ca6f4e5dd0eb274c9f3644" }, { "type": "WEB", "url": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9002fd07327a91f35ba6c1307e71fa6fd4409b7f" }, { "type": "WEB", "url": "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=91ddeba0f2269b017dc06c46c993a788974b1aa5" }, { "type": "WEB", "url": "https://lists.debian.org/debian-lts-announce/2023/08/msg00019.html" }, { "type": "WEB", "url": "https://security.gentoo.org/glsa/202402-08" }, { "type": "WEB", "url": "https://security.netapp.com/advisory/ntap-20230818-0014" }, { "type": "WEB", "url": "https://security.netapp.com/advisory/ntap-20231027-0008" }, { "type": "WEB", "url": "https://security.netapp.com/advisory/ntap-20240621-0006" }, { "type": "WEB", "url": "https://www.openssl.org/news/secadv/20230731.txt" }, { "type": "WEB", "url": "http://seclists.org/fulldisclosure/2023/Jul/43" }, { "type": "WEB", "url": "http://www.openwall.com/lists/oss-security/2023/07/31/1" }, { "type": "WEB", "url": "http://www.openwall.com/lists/oss-security/2023/09/22/11" }, { "type": "WEB", "url": "http://www.openwall.com/lists/oss-security/2023/09/22/9" }, { "type": "WEB", "url": "http://www.openwall.com/lists/oss-security/2023/11/06/2" } ], "schema_version": "1.4.0", "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "type": "CVSS_V3" } ] }
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- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.