USN-4738-1: OpenSSL vulnerabilities | Cloud Foundry

Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 16.04
• Canonical Ubuntu 18.04

Description

Paul Kehrer discovered that OpenSSL incorrectly handled certain input lengths in EVP functions. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2021-23840)

Tavis Ormandy discovered that OpenSSL incorrectly handled parsing issuer fields. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2021-23841)

CVEs contained in this USN include: CVE-2021-23841, CVE-2021-23840.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

• cflinuxfs3
  • All versions prior to 0.224.0
• Xenial Stemcells
  • 456.x versions prior to 456.144
  • 621.x versions prior to 621.107
  • All other stemcells not listed.
• CF Deployment
  • All versions prior to 16.5.0

Mitigation

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

• cflinuxfs3
  • Upgrade All versions to 0.224.0 or greater
• Xenial Stemcells
  • Upgrade 456.x versions to 456.144 or greater
  • Upgrade 621.x versions to 621.107 or greater
  • All other stemcells should be upgraded to the latest version available on bosh.io.
• CF Deployment
  • Upgrade All versions to 16.5.0 or greater

References

• USN Notice
• CVE-2021-23841
• CVE-2021-23840

History

2021-03-02: Initial vulnerability report published.