Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 14.04

Description

It was discovered that the resolver in Bind made incorrect assumptions about ordering when processing responses containing a CNAME or DNAME. An attacker could use this cause a denial of service. (CVE-2017-3137)

Oleg Gorokhov discovered that in some situations, Bind did not properly handle DNS64 queries. An attacker could use this to cause a denial of service. (CVE-2017-3136)

Mike Lalumiere discovered that in some situations, Bind did not properly handle invalid operations requested via its control channel. An attacker with access to the control channel could cause a denial of service. (CVE-2017-3138)

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

• Cloud Foundry BOSH stemcells are vulnerable, including:
  • 3151.x versions prior to 3151.16
  • 3263.x versions prior to 3263.24
  • 3312.x versions prior to 3312.24
  • 3363.x versions prior to 3363.20
  • All other stemcells not listed.
• All versions of Cloud Foundry cflinuxfs2 prior to 1.114.0

Mitigation

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

• The Cloud Foundry project recommends upgrading the following BOSH stemcells:
  • Upgrade 3151.x versions to 3151.16 or later
  • Upgrade 3263.x versions to 3263.24 or later
  • Upgrade 3312.x versions to 3312.24 or later
  • Upgrade 3363.x versions to 3363.20 or later
  • All other stemcells should be upgraded to the latest version.
• The Cloud Foundry project recommends that Cloud Foundry deployments run with cflinuxfs2 versions 1.114.0 or later.

References

• USN-3259-1
• CVE-2017-3137
• CVE-2017-3136
• CVE-2017-3138
• bosh.io