-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Excessive Resource Usage Verifying X.509 Policy Constraints (CVE-2023-0464) =========================================================================== Severity: Low 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. OpenSSL 3.1, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue. Due to the low severity of this issue we are not issuing new releases of OpenSSL at this time. The fix will be included in the next releases when they become available. The fix is also available in commit 2017771e (for 3.1), commit 959c59c7 (for 3.0), commit 879f7080 (for 1.1.1) in the OpenSSL git repository, and commit 2dcd4f1e (for 1.0.2) in the OpenSSL git repository for premium customers. Once they are released: OpenSSL 3.1 users should upgrade to 3.1.1. OpenSSL 3.0 users should upgrade to 3.0.9. OpenSSL 1.1.1 users should upgrade to 1.1.1u. OpenSSL 1.0.2 users should upgrade to 1.0.2zh (premium support customers only). This issue was reported on 12th January 2023 by David Benjamin (Google). The fix was developed by Dr Paul Dale. OpenSSL 1.1.1 will reach end-of-life on 2023-09-11. After that date security fixes for 1.1.1 will only be available to premium support customers. References ========== URL for this Security Advisory: https://www.openssl.org/news/secadv/20230322.txt Note: the online version of the advisory may be updated with additional details over time. For details of OpenSSL severity classifications please see: https://www.openssl.org/policies/secpolicy.html -----BEGIN PGP SIGNATURE----- iQJGBAEBCAAwFiEE3HAyZir4heL0fyQ/UnRmohynnm0FAmQbItgSHHRvbWFzQG9w ZW5zc2wub3JnAAoJEFJ0ZqIcp55t8AgP/3mUOflbZ7e8yLjgEMqFqCSFlSQo5bFK gh2h2NOKBjkvzFtlqnAR+bqNPAr9CEosSRF1LiVtKu9RhaIh1LlTsp53aFWSP48p 7LekiPmd5hnorO72dB1eLlbHPIe0lh2It2cDlkYc95BVcttQEzHbyygVKBD0f0cN WqslsIeVPIqMIZMHAlpnINz630Rsn/4cif+6U8gYgNN51f7WeCArPp3U7hAhHVuC b7lOVXBNzdfdFzKVjSTHqvWBib/Ji+Ga4knHFZya7VLQagKjDJiQB9uBpuCOmzxD kb9nJCSroIwf74wDxJxr4gb314/hju+jpC2Xny8l7SXxJUahdMywJLgofPMEOhWb lRod8SHr0Je5Gpp4R+p6cmwr0PM76KPxcLOvsa7OsIwIZQvFyxMVvsGYdMxg0ads qDqROqkb1Mx+Fa0smySe6Xru0RtEgXAk7AIltz8AqHmCvMED8S7ZwhsHipM/eLYZ Iky8SsSYn4K3a4Sa05+IrQARWmDCZHRHp9JfHacPq0HunNrAX5unDfHUNAx1TZcX 0cSeN/SF56sds+SEjJpURCHxO+Z4toUxpaVKqZyLsDhuq/IwrbbaxhBFkNiHcWOg vCinoWvhpjo2YBs0BVJNIu4wpNhnCwOP7+91zmTAvD28xoBhSHKWkwGuypPkW3bO Y6lneBDfoNpj =iUFS -----END PGP SIGNATURE-----
