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Vulnerability · Published Mar 22, 2023 · Assigned by openssl

CVE-2023-0464Excessive Resource Usage Verifying X.509 Policy Constraints

High 7.5

In plain English

A high-severity improper certificate validation 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 4.0% (higher than 91% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)4.0%top 9.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official description

A security vulnerability has been identified in all supported versions of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems. Policy processing is disabled by default but can be enabled by passing the `-policy' argument to the command line utilities or by calling the `X509_VERIFY_PARAM_set1_policies()' function.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:9openssl1:3.0.7-16.el9_2ALSA-2023:3722
AlmaLinux:9openssl-devel1:3.0.7-16.el9_2ALSA-2023:3722
AlmaLinux:9openssl-libs1:3.0.7-16.el9_2ALSA-2023:3722
AlmaLinux:9openssl-perl1:3.0.7-16.el9_2ALSA-2023:3722
Alpine:v3.20openssl3.1.0-r1ALPINE-CVE-2023-0464
Alpine:v3.21openssl3.1.0-r1ALPINE-CVE-2023-0464
Alpine:v3.22openssl3.1.0-r1ALPINE-CVE-2023-0464
Alpine:v3.23openssl3.1.0-r1ALPINE-CVE-2023-0464
Alpine:v3.24openssl3.1.0-r1ALPINE-CVE-2023-0464
Debian:12openssl3.0.9-1DEBIAN-CVE-2023-0464
Debian:13openssl3.0.9-1DEBIAN-CVE-2023-0464
Debian:14openssl3.0.9-1DEBIAN-CVE-2023-0464
Ubuntu:22.04:LTSedk22022.02-3ubuntu0.22.04.4UBUNTU-CVE-2023-0464
Ubuntu:22.04:LTSedk22022.02-3ubuntu0.22.04.4USN-7894-1
Ubuntu:24.04:LTSedk22024.02-2ubuntu0.6USN-7894-1
Ubuntu:22.04:LTSopenssl3.0.2-0ubuntu1.9USN-6039-1
Ubuntu:22.04:LTSopenssl3.0.2-0ubuntu1.9UBUNTU-CVE-2023-0464

Affected products (as reported)

VendorProductVersions
OpenSSL OpenSSL 3.1.0 – before 3.1.13.0.0 – before 3.0.91.1.1 – before 1.1.1u1.0.2 – before 1.0.2zh

Weakness: CWE-295 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References