USN-4504-1: OpenSSL vulnerabilities

Severity

Low

Vendor

Canonical Ubuntu

Description

Robert Merget, Marcus Brinkmann, Nimrod Aviram, and Juraj Somorovsky discovered that certain Diffie-Hellman ciphersuites in the TLS specification and implemented by OpenSSL contained a flaw. A remote attacker could possibly use this issue to eavesdrop on encrypted communications. This was fixed in this update by removing the insecure ciphersuites from OpenSSL. (CVE-2020-1968)

Cesar Pereida García, Sohaib ul Hassan, Nicola Tuveri, Iaroslav Gridin, Alejandro Cabrera Aldaya, and Billy Brumley discovered that OpenSSL incorrectly handled ECDSA signatures. 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. (CVE-2019-1547)

Guido Vranken discovered that OpenSSL incorrectly performed the x86_64 Montgomery squaring procedure. While unlikely, a remote attacker could possibly use this issue to recover private keys. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-1551)

Bernd Edlinger discovered that OpenSSL incorrectly handled certain decryption functions. In certain scenarios, a remote attacker could possibly use this issue to perform a padding oracle attack and decrypt traffic. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-1563)

CVEs contained in this USN include: CVE-2019-1547, CVE-2019-1551, CVE-2019-1563, CVE-2020-1968.

Affected Cloud Foundry Products and Versions

Severity is low unless otherwise noted.

• cflinuxfs3
  • All versions prior to 0.205.0
• Xenial Stemcells
  • 250.x versions prior to 250.207
  • 315.x versions prior to 315.194
  • 456.x versions prior to 456.121
  • 621.x versions prior to 621.85
  • All other stemcells not listed.
• CF Deployment
  • All versions prior to 14.0.0

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 0.205.0 or greater
• Xenial Stemcells
  • Upgrade 250.x versions to 250.207 or greater
  • Upgrade 315.x versions to 315.194 or greater
  • Upgrade 456.x versions to 456.121 or greater
  • Upgrade 621.x versions to 621.85 or greater
  • All other stemcells should be upgraded to the latest version available on bosh.io.
• CF Deployment
  • Upgrade All versions to 14.0.0 or greater

History

2021-02-10: Initial vulnerability report published.