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CVE-2022-3996

Status Candidate

Overview

If an X.509 certificate contains a malformed policy constraint and policy processing is enabled, then a write lock will be taken twice recursively. On some operating systems (most widely: Windows) this results in a denial of service when the affected process hangs. Policy processing being enabled on a publicly facing server is not considered to be a common setup. Policy processing is enabled by passing the `-policy' argument to the command line utilities or by calling the `X509_VERIFY_PARAM_set1_policies()' function. Update (31 March 2023): The description of the policy processing enablement was corrected based on CVE-2023-0466.

Related Files

Ubuntu Security Notice USN-6039-1
Posted Apr 26, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6039-1 - It was discovered that OpenSSL was not properly managing file locks when processing policy constraints. If a user or automated system were tricked into processing a certificate chain with specially crafted policy constraints, a remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 22.04 LTS and Ubuntu 22.10. David Benjamin discovered that OpenSSL was not properly performing the verification of X.509 certificate chains that include policy constraints, which could lead to excessive resource consumption. If a user or automated system were tricked into processing a specially crafted X.509 certificate chain that includes policy constraints, a remote attacker could possibly use this issue to cause a denial of service.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2022-3996, CVE-2023-0464, CVE-2023-0465, CVE-2023-0466
SHA-256 | eadba9a6b350964348dfb8cdb88af943d8fef03500b5392c3de74160dd5725ad
OpenSSL Toolkit 3.0.8
Posted Feb 8, 2023
Site openssl.org

OpenSSL is a robust, fully featured Open Source toolkit implementing the Secure Sockets Layer and Transport Layer Security protocols with full-strength cryptography world-wide. The 3.x series is the current major version of OpenSSL.

Changes: Fixed NULL dereference during PKCS7 data verification. Fixed X.400 address type confusion in X.509 GeneralName. Fixed NULL dereference validating DSA public key. Fixed invalid pointer dereference in d2i_PKCS7 functions. Fixed use-after-free following BIO_new_NDEF. Fixed double-free after calling PEM_read_bio_ex. Fixed timing oracle in RSA decryption. Fixed X.509 Name Constraints read buffer overflow. Fixed X.509 policy constraints double locking.
tags | tool, encryption, protocol
systems | unix
advisories | CVE-2022-3996, CVE-2022-4203, CVE-2022-4304, CVE-2022-4450, CVE-2023-0215, CVE-2023-0216, CVE-2023-0217, CVE-2023-0286, CVE-2023-0401
SHA-256 | 6c13d2bf38fdf31eac3ce2a347073673f5d63263398f1f69d0df4a41253e4b3e
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