CVE-2023-3817
Description
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.
How to fix
- openssl openssl3.0.10, 3.1.2 or later
- git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a1eb62c29db6cb5eec707f9338aee00f44e26f5
- git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9002fd07327a91f35ba6c1307e71fa6fd4409b7f
- git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=91ddeba0f2269b017dc06c46c993a788974b1aa5
- git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=869ad69aadd985c7b8ca6f4e5dd0eb274c9f3644
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| openssl openssl | 3.0.0 ≤ v < 3.0.10, 3.1.0 ≤ v < 3.1.2, 1.0.2, 1.0.2a, 1.0.2b, 1.0.2c, 1.0.2d, 1.0.2e, 1.0.2f, 1.0.2g, 1.0.2h, 1.0.2i, 1.0.2j, 1.0.2k, 1.0.2l, 1.0.2m, 1.0.2n, 1.0.2o, 1.0.2p, 1.0.2q, 1.0.2r, 1.0.2s, 1.0.2t, 1.0.2u, 1.0.2v, 1.0.2w, 1.0.2x, 1.0.2y, 1.0.2za, 1.0.2zb, 1.0.2zc, 1.0.2zd, 1.0.2ze, 1.0.2zf, 1.0.2zg, 1.0.2zh, 1.1.1, 1.1.1a, 1.1.1b, 1.1.1c, 1.1.1d, 1.1.1e, 1.1.1f, 1.1.1g, 1.1.1h, 1.1.1i, 1.1.1j, 1.1.1k, 1.1.1l, 1.1.1m, 1.1.1n, 1.1.1o, 1.1.1p, 1.1.1q, 1.1.1r, 1.1.1s, 1.1.1t, 1.1.1u | 3.0.10, 3.1.2 |
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