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Security Advisory

USN-3840-1: OpenSSL vulnerabilities

USN-3840-1: OpenSSL vulnerabilities

Severity

Low

Vendor

Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 14.04
  • Canonical Ubuntu 16.04
  • Canonical Ubuntu 18.04

Description

Samuel Weiser discovered that OpenSSL incorrectly handled DSA signing. An attacker could possibly use this issue to perform a timing side-channel attack and recover private DSA keys. (CVE-2018-0734)

Samuel Weiser discovered that OpenSSL incorrectly handled ECDSA signing. An attacker could possibly use this issue to perform a timing side-channel attack and recover private ECDSA keys. This issue only affected Ubuntu 18.04 LTS and Ubuntu 18.10. (CVE-2018-0735)

Billy Bob Brumley, Cesar Pereida Garcia, Sohaib ul Hassan, Nicola Tuveri, and Alejandro Cabrera Aldaya discovered that Simultaneous Multithreading (SMT) architectures are vulnerable to side-channel leakage. This issue is known as “PortSmash”. An attacker could possibly use this issue to perform a timing side-channel attack and recover private keys. (CVE-2018-5407)

CVEs contained in this USN include: CVE-2018-0734, CVE-2018-0735, CVE-2018-5407

Affected Cloud Foundry Products and Versions

Severity is low unless otherwise noted.

  • Cloud Foundry BOSH trusty-stemcells are vulnerable, including:
    • 3586.x versions prior to 3586.65
    • 3541.x versions prior to 3541.69
    • 3468.x versions prior to 3468.90
    • 3445.x versions prior to 3445.87
    • 3421.x versions prior to 3421.104
    • All other stemcells not listed.
  • Cloud Foundry BOSH xenial-stemcells are vulnerable, including:
    • 170.x versions prior to 170.14
    • 97.x versions prior to 97.41
    • All other stemcells not listed.
  • All versions of Cloud Foundry cflinuxfs2 prior to 1.254.0
  • All versions of Cloud Foundry cflinuxfs3 prior to 0.46.0

Mitigation

Users of affected products are strongly encouraged to follow one of the mitigations below:

  • The Cloud Foundry project recommends upgrading the following BOSH trusty-stemcells:
    • Upgrade 3586.x versions to 3586.65
    • Upgrade 3541.x versions to 3541.69
    • Upgrade 3468.x versions to 3468.90
    • Upgrade 3445.x versions to 3445.87
    • Upgrade 3421.x versions to 3421.104
    • All other stemcells should be upgraded to the latest version available on bosh.io.
  • The Cloud Foundry project recommends upgrading the following BOSH xenial-stemcells:
    • Upgrade 170.x versions to 170.14
    • Upgrade 97.x versions to 97.41
    • All other stemcells should be upgraded to the latest version available on bosh.io.
  • The Cloud Foundry project recommends that Cloud Foundry deployments run with cflinuxfs2 version 1.254.0 or later.
  • The Cloud Foundry project recommends that Cloud Foundry deployments run with cflinuxfs3 version 0.46.0 or later.

References

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR

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