CVE-2023-3817
描述
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.
如何修補 CVE-2023-3817
要修補 CVE-2023-3817,請將受影響套件升級到下列已修補版本。
- —升級至 1.1.1v-r0 或更新版本
- —升級至 3.0.11-r0 或更新版本
CVE-2023-3817 正在被利用嗎?
低 — EPSS 為 2.6%,目前沒有觀察到大規模利用活動。
受影響套件(2)
- >= 3.0.0, < 1.1.1v-r0
- from 0, < 3.0.11-r0