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.
Published 2023-07-31 16:15:10
Updated 2024-02-04 09:15:10
View at NVD,   CVE.org
Vulnerability category: Denial of service

Exploit prediction scoring system (EPSS) score for CVE-2023-3817

Probability of exploitation activity in the next 30 days: 0.13%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 48 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2023-3817

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
5.3
MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.9
1.4
NIST
5.3
MEDIUM AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
N/A
N/A
Oracle:CPUOct2023

CWE ids for CVE-2023-3817

  • The product performs an iteration or loop without sufficiently limiting the number of times that the loop is executed.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2023-3817

Products affected by CVE-2023-3817

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