USN-6039-1: OpenSSL vulnerabilities

Severity

Low

Vendor

Canonical Ubuntu

Description

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. (CVE-2022-3996) 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. (CVE-2023-0464) David Benjamin discovered that OpenSSL was not properly handling invalid certificate policies in leaf certificates, which would result in certain policy checks being skipped for the certificate. If a user or automated system were tricked into processing a specially crafted certificate, a remote attacker could possibly use this issue to assert invalid certificate policies and circumvent policy checking. (CVE-2023-0465) David Benjamin discovered that OpenSSL incorrectly documented the functionalities of function X509_VERIFY_PARAM_add0_policy, stating that it would implicitly enable certificate policy checks when doing certificate verifications, contrary to its implementation. This could cause users and applications to not perform certificate policy checks even when expected to do so. (CVE-2023-0466) Update Instructions: Run `sudo pro fix USN-6039-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: libssl-dev – 1.0.2g-1ubuntu4.20+esm7 openssl – 1.0.2g-1ubuntu4.20+esm7 libssl-doc – 1.0.2g-1ubuntu4.20+esm7 libssl1.0.0 – 1.0.2g-1ubuntu4.20+esm7 Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

CVEs contained in this USN include: CVE-2022-3996, CVE-2023-0464, CVE-2023-0466.

Affected Cloud Foundry Products and Versions

Severity is low unless otherwise noted.

• Bionic Stemcells
  • 1.x versions prior to 1.201
  • All other stemcells not listed.
• cflinuxfs3
  • All versions prior to 0.364.0
• cflinuxfs4
  • All versions prior to 1.7.0
• Jammy Stemcells
  • 1.x versions prior to 1.108
  • All other stemcells not listed.
• CF Deployment
  • All versions prior to 28.1.0, or later versions with Jammy Stemcells prior to 1.108 or Bionic Stemcells prior to 1.201

Mitigation

Users of affected products are strongly encouraged to follow the mitigations below. The Cloud Foundry project recommends upgrading the following releases:

• Bionic Stemcells
  • Upgrade 1.x versions to 1.201 or greater
  • All other stemcells should be upgraded to the latest version available on bosh.io.
• cflinuxfs3
  • Upgrade all versions to 0.364.0 or greater
• cflinuxfs4
  • Upgrade all versions to 1.7.0 or greater
• Jammy Stemcells
  • Upgrade 1.x versions to 1.108 or greater
  • All other stemcells should be upgraded to the latest version available on bosh.io.
• CF Deployment
  • Upgrade all versions to 28.1.0 or greater, upgrade Jammy Stemcells to 1.108 or greater, and upgrade Bionic Stemcells to 1.201 or greater

History

2023-06-30: Initial vulnerability report published.