USN-3183-1: GnuTLS Vulnerabilities

Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 14.04 LTS

Description

Stefan Buehler discovered that GnuTLS incorrectly verified the serial length of OCSP responses. A remote attacker could possibly use this issue to bypass certain certificate validation measures. This issue only applied to Ubuntu 16.04 LTS. (CVE-2016-7444)

Shi Lei discovered that GnuTLS incorrectly handled certain warning alerts.A remote attacker could possibly use this issue to cause GnuTLS to hang,resulting in a denial of service. This issue has only been addressed in Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-8610)

It was discovered that GnuTLS incorrectly decoded X.509 certificates with a Proxy Certificate Information extension. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2017-5334)

It was discovered that GnuTLS incorrectly handled certain Open PGP certificates. A remote attacker could possibly use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2017-5335, CVE-2017-5336, CVE-2017-5337)

 

 

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

• Cloud Foundry BOSH stemcells are vulnerable, including:
  • 3151.x versions prior to 3151.11
  • 3233.x versions prior to 3233.14
  • 3263.x versions prior to 3263.20
  • 3312.x versions prior to 3312.20
  • 3363.x versions prior to 3363.9
• All versions of Cloud Foundry cflinuxfs2 prior to v1.99.0

Mitigation

OSS users are strongly encouraged to follow one of the mitigations below:

• The Cloud Foundry team recommends upgrading to the following BOSH stemcells:
  • Upgrade 3151.x versions to 3151.11 or later
  • Upgrade 3233.x versions to 3233.14 or later
  • Upgrade 3263.x versions to 3263.20 or later
  • Upgrade 3312.x versions to 3312.20 or later
  • Upgrade 3363.x versions to 3363.9 or later
• The Cloud Foundry project recommends that Cloud Foundry deployments run with cflinuxfs2 v1.99.00 or later versions

References

• https://www.ubuntu.com/usn/usn-3183-1/
• CVE-2016-7444
• CVE-2016-8610
• CVE-2017-5334
• CVE-2017-5335
• CVE-2017-5336
• CVE-2017-5337