Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

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

Description

Jayakrishna Menon discovered that Perl incorrectly handled Perl_my_setenv. An attacker could use this issue to cause Perl to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2018-18311)

Eiichi Tsukata discovered that Perl incorrectly handled certain regular expressions. An attacker could use this issue to cause Perl to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 18.10. (CVE-2018-18312)

Eiichi Tsukata discovered that Perl incorrectly handled certain regular expressions. An attacker could use this issue to cause Perl to crash, resulting in a denial of service. (CVE-2018-18313)

Jakub Wilk discovered that Perl incorrectly handled certain regular expressions. An attacker could use this issue to cause Perl to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 18.10. (CVE-2018-18314)

CVEs contained in this USN include: CVE-2018-18311, CVE-2018-18312, CVE-2018-18313, CVE-2018-18314

Affected Cloud Foundry Products and Versions

Severity is medium 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 170.12
  • 97.x versions prior to 97.39
  • All other stemcells not listed.
• All versions of Cloud Foundry cflinuxfs2 prior to 1.253.0
• All versions of Cloud Foundry cflinuxfs3 prior to 0.44.0

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 170.12
  • Upgrade 97.x versions to 97.39
  • 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 1.253.0 or later.
• The Cloud Foundry project recommends that Cloud Foundry deployments run with cflinuxfs3 version 0.44.0 or later.

References

• USN-3834-1
• CVE-2018-18311
• CVE-2018-18312
• CVE-2018-18313
• CVE-2018-18314