Log in Start free

Vulnerability · Published Nov 6, 2023 · Assigned by openssl

CVE-2023-5678Excessive time spent in DH check / generation with large 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 4.5% (higher than 91% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)4.5%top 8.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Issue summary: Generating excessively long X9.42 DH keys or checking excessively long X9.42 DH keys or parameters may be very slow. Impact summary: Applications that use the functions DH_generate_key() to generate an X9.42 DH key may experience long delays. Likewise, applications that use DH_check_pub_key(), DH_check_pub_key_ex() or EVP_PKEY_public_check() to check an X9.42 DH key or X9.42 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. While DH_check() performs all the necessary checks (as of CVE-2023-3817), DH_check_pub_key() doesn't make any of these checks, and is therefore vulnerable for excessively large P and Q parameters. Likewise, while DH_generate_key() performs a check for an excessively large P, it doesn't check for an excessively large Q. An application that calls DH_generate_key() or DH_check_pub_key() and supplies a key or parameters obtained from an untrusted source could be vulnerable to a Denial of Service attack. DH_generate_key() and DH_check_pub_key() are also 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_pub_key_ex(), EVP_PKEY_public_check(), and EVP_PKEY_generate(). Also vulnerable are the OpenSSL pkey command line application when using the "-pubcheck" option, as well as the OpenSSL genpkey command line application. 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

EcosystemPackageFixed inAdvisory
AlmaLinux:8openssl1:1.1.1k-12.el8_9ALSA-2023:7877
AlmaLinux:9openssl1:3.0.7-27.el9ALSA-2024:2447
AlmaLinux:8openssl-devel1:1.1.1k-12.el8_9ALSA-2023:7877
AlmaLinux:9openssl-devel1:3.0.7-27.el9ALSA-2024:2447
AlmaLinux:8openssl-libs1:1.1.1k-12.el8_9ALSA-2023:7877
AlmaLinux:9openssl-libs1:3.0.7-27.el9ALSA-2024:2447
AlmaLinux:8openssl-perl1:1.1.1k-12.el8_9ALSA-2023:7877
AlmaLinux:9openssl-perl1:3.0.7-27.el9ALSA-2024:2447
Alpine:v3.20openssl3.1.4-r1ALPINE-CVE-2023-5678
Alpine:v3.21openssl3.1.4-r1ALPINE-CVE-2023-5678
Alpine:v3.22openssl3.1.4-r1ALPINE-CVE-2023-5678
Alpine:v3.23openssl3.1.4-r1ALPINE-CVE-2023-5678
Alpine:v3.24openssl3.1.4-r1ALPINE-CVE-2023-5678
Debian:12openssl3.0.13-1~deb12u1DEBIAN-CVE-2023-5678
Debian:13openssl3.0.12-2DEBIAN-CVE-2023-5678
Debian:14openssl3.0.12-2DEBIAN-CVE-2023-5678
Rocky Linux:8openssl1:1.1.1k-12.el8_9RLSA-2023:7877
Ubuntu:22.04:LTSedk22022.02-3ubuntu0.22.04.4UBUNTU-CVE-2023-5678
Ubuntu:22.04:LTSedk22022.02-3ubuntu0.22.04.4USN-7894-1
Ubuntu:24.04:LTSedk22024.02-2ubuntu0.6UBUNTU-CVE-2023-5678
Ubuntu:24.04:LTSedk22024.02-2ubuntu0.6USN-7894-1
Ubuntu:22.04:LTSopenssl3.0.2-0ubuntu1.14USN-6622-1
Ubuntu:22.04:LTSopenssl3.0.2-0ubuntu1.14UBUNTU-CVE-2023-5678
Ubuntu:24.04:LTSopenssl3.0.10-1ubuntu4UBUNTU-CVE-2023-5678

Affected products (as reported)

VendorProductVersions
OpenSSL OpenSSL 1.0.2 – before 1.0.2zj1.1.1 – before 1.1.1x3.0.0 – before 3.0.133.1.0 – before 3.1.5

Weakness: CWE-606 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References