CVE-2023-3817
Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service.
Does this matter?
Lower severity and a low EPSS score (3.05%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- EPSS
- 3.05% probability · 87th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-606, CWE-834
- Affected
- openssl/openssl
- Source
- openssl-security@openssl.org
References
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a1eb62c29db6cb5eec707f9338aee00f44e26f5Mailing List, Patch
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=869ad69aadd985c7b8ca6f4e5dd0eb274c9f3644Broken Link
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9002fd07327a91f35ba6c1307e71fa6fd4409b7fMailing List, Patch
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=91ddeba0f2269b017dc06c46c993a788974b1aa5Mailing List, Patch
- https://www.openssl.org/news/secadv/20230731.txtVendor Advisory
- http://seclists.org/fulldisclosure/2023/Jul/43
- http://www.openwall.com/lists/oss-security/2023/07/31/1
- http://www.openwall.com/lists/oss-security/2023/09/22/11
- http://www.openwall.com/lists/oss-security/2023/09/22/9
- http://www.openwall.com/lists/oss-security/2023/11/06/2
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a1eb62c29db6cb5eec707f9338aee00f44e26f5Mailing List, Patch
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=869ad69aadd985c7b8ca6f4e5dd0eb274c9f3644Broken Link
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9002fd07327a91f35ba6c1307e71fa6fd4409b7fMailing List, Patch
- https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=91ddeba0f2269b017dc06c46c993a788974b1aa5Mailing List, Patch
- https://lists.debian.org/debian-lts-announce/2023/08/msg00019.html
- https://security.gentoo.org/glsa/202402-08
- https://security.netapp.com/advisory/ntap-20230818-0014/
- https://security.netapp.com/advisory/ntap-20231027-0008/
- https://security.netapp.com/advisory/ntap-20240621-0006/
- https://www.openssl.org/news/secadv/20230731.txtVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.