Vulnerability-Lookup

GHSA-C945-CQJ5-WFV6

Vulnerability from github – Published: 2023-07-31 18:30 – Updated: 2024-06-21 21:33

Details

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.

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Show details on source website

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{
  "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",
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-3817"
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    {
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}

CVE-2023-3817 (GCVE-0-2023-3817)

Vulnerability from cvelistv5 – Published: 2023-07-31 15:34 – Updated: 2025-05-05 15:53

Title

Excessive time spent checking DH q parameter value

Summary

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.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-04-23 13:26 UTC

CWE

CWE-606 - Unchecked Input for Loop Condition

Assigner

openssl mitre root

References

15 references

URL	Tags
https://www.openssl.org/news/secadv/20230731.txt	vendor-advisory
https://git.openssl.org/gitweb/?p=openssl.git;a=c…	patch
https://git.openssl.org/gitweb/?p=openssl.git;a=c…	patch
https://git.openssl.org/gitweb/?p=openssl.git;a=c…	patch
https://git.openssl.org/gitweb/?p=openssl.git;a=c…	patch
http://seclists.org/fulldisclosure/2023/Jul/43	x_transferred
http://www.openwall.com/lists/oss-security/2023/07/31/1	x_transferred
https://lists.debian.org/debian-lts-announce/2023…	x_transferred
https://security.netapp.com/advisory/ntap-2023081…	x_transferred
http://www.openwall.com/lists/oss-security/2023/09/22/9	x_transferred
http://www.openwall.com/lists/oss-security/2023/0…	x_transferred
https://security.netapp.com/advisory/ntap-2023102…	x_transferred
http://www.openwall.com/lists/oss-security/2023/11/06/2	x_transferred
https://security.gentoo.org/glsa/202402-08	x_transferred
https://security.netapp.com/advisory/ntap-2024062…	x_transferred

Impacted products

1 product

Vendor	Product	Version
OpenSSL	OpenSSL	Affected: 3.1.0 , < 3.1.2 (semver) Affected: 3.0.0 , < 3.0.10 (semver) Affected: 1.1.1 , < 1.1.1v (custom) Affected: 1.0.2 , < 1.0.2zi (custom)

Date Public

2023-07-31 00:00

Credits

Bernd Edlinger Tomas Mraz

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.