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Security Advisory

USN-4738-1: OpenSSL vulnerabilities

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 onĀ bosh.io.
  • CF Deployment
    • Upgrade All versions to 16.5.0 or greater

History

2021-03-02: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR

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