Vulnerability · Published Jul 31, 2023 · Assigned by openssl
CVE-2023-3817Excessive time spent checking DH q parameter value
Medium 5.3
In plain English
A medium-severity security flaw in OpenSSL from OpenSSL. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.0% (higher than 88% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | openssl | 1:1.1.1k-12.el8_9 | ALSA-2023:7877 |
| AlmaLinux:9 | openssl | 1:3.0.7-27.el9 | ALSA-2024:2447 |
| AlmaLinux:8 | openssl-devel | 1:1.1.1k-12.el8_9 | ALSA-2023:7877 |
| AlmaLinux:9 | openssl-devel | 1:3.0.7-27.el9 | ALSA-2024:2447 |
| AlmaLinux:8 | openssl-libs | 1:1.1.1k-12.el8_9 | ALSA-2023:7877 |
| AlmaLinux:9 | openssl-libs | 1:3.0.7-27.el9 | ALSA-2024:2447 |
| AlmaLinux:8 | openssl-perl | 1:1.1.1k-12.el8_9 | ALSA-2023:7877 |
| AlmaLinux:9 | openssl-perl | 1:3.0.7-27.el9 | ALSA-2024:2447 |
| Alpine:v3.20 | openssl | 3.1.2-r0 | ALPINE-CVE-2023-3817 |
| Alpine:v3.21 | openssl | 3.1.2-r0 | ALPINE-CVE-2023-3817 |
| Alpine:v3.22 | openssl | 3.1.2-r0 | ALPINE-CVE-2023-3817 |
| Alpine:v3.23 | openssl | 3.1.2-r0 | ALPINE-CVE-2023-3817 |
| Alpine:v3.24 | openssl | 3.1.2-r0 | ALPINE-CVE-2023-3817 |
| Debian:12 | openssl | 3.0.10-1~deb12u1 | DEBIAN-CVE-2023-3817 |
| Debian:13 | openssl | 3.0.10-1 | DEBIAN-CVE-2023-3817 |
| Debian:14 | openssl | 3.0.10-1 | DEBIAN-CVE-2023-3817 |
| Rocky Linux:8 | openssl | 1:1.1.1k-12.el8_9 | RLSA-2023:7877 |
| Ubuntu:22.04:LTS | edk2 | 2022.02-3ubuntu0.22.04.4 | USN-7894-1 |
| Ubuntu:22.04:LTS | edk2 | 2022.02-3ubuntu0.22.04.4 | UBUNTU-CVE-2023-3817 |
| Ubuntu:24.04:LTS | edk2 | 2024.02-2ubuntu0.6 | UBUNTU-CVE-2023-3817 |
| Ubuntu:24.04:LTS | edk2 | 2024.02-2ubuntu0.6 | USN-7894-1 |
| Ubuntu:22.04:LTS | openssl | 3.0.2-0ubuntu1.12 | UBUNTU-CVE-2023-3817 |
| Ubuntu:22.04:LTS | openssl | 3.0.2-0ubuntu1.12 | USN-6450-1 |
Affected products (as reported)
Weakness: CWE-606 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References
- OpenSSL Advisory vendor-advisory
- 3.1.2 git commit patch
- 3.0.10 git commit patch
- 1.1.1v git commit patch
- 1.0.2zi patch (premium) 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/2023/08/msg00019.html x_transferred
- https://security.netapp.com/advisory/ntap-20230818-0014/ x_transferred
- http://www.openwall.com/lists/oss-security/2023/09/22/9 x_transferred
- http://www.openwall.com/lists/oss-security/2023/09/22/11 x_transferred
- https://security.netapp.com/advisory/ntap-20231027-0008/ 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-20240621-0006/ x_transferred
- https://cert-portal.siemens.com/productcert/html/ssa-099606.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-943925.html
- https://cert-portal.siemens.com/productcert/html/ssa-915275.html