Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

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

Description

Tyler Hicks discovered that BusyBox incorrectly handled symlinks inside tar archives. If a user or automated system were tricked into processing a specially crafted tar archive, a remote attacker could overwrite arbitrary files outside of the current directory. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2011-5325)

Mathias Krause discovered that BusyBox incorrectly handled kernel module loading restrictions. A local attacker could possibly use this issue to bypass intended restrictions. This issue only affected Ubuntu 14.04 LTS. (CVE-2014-9645)

It was discovered that BusyBox incorrectly handled certain ZIP archives. If a user or automated system were tricked into processing a specially crafted ZIP archive, a remote attacker could cause BusyBox to crash, leading to a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2015-9261)

Nico Golde discovered that the BusyBox DHCP client incorrectly handled certain malformed domain names. A remote attacker could possibly use this issue to cause the DHCP client to crash, leading to a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-2147)

Nico Golde discovered that the BusyBox DHCP client incorrectly handled certain 6RD options. A remote attacker could use this issue to cause the DHCP client to crash, leading to a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-2148)

It was discovered that BusyBox incorrectly handled certain bzip2 archives. If a user or automated system were tricked into processing a specially crafted bzip2 archive, a remote attacker could cause BusyBox to crash, leading to a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2017-15873)

It was discovered that BusyBox incorrectly handled tab completion. A local attacker could possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2017-16544)

It was discovered that the BusyBox wget utility incorrectly handled certain responses. A remote attacker could use this issue to cause BusyBox to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2018-1000517)

It was discovered that the BusyBox DHCP utilities incorrectly handled certain memory operations. A remote attacker could possibly use this issue to access sensitive information. (CVE-2018-20679, CVE-2019-5747)

CVEs contained in this USN include: CVE-2011-5325, CVE-2014-9645, CVE-2015-9261, CVE-2016-2147, CVE-2016-2148, CVE-2017-15873, CVE-2017-16544, CVE-2018-1000517, CVE-2018-20679, CVE-2019-5747

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 3586.96
  • 3541.x versions prior to 3541.93
  • 3468.x versions prior to 3468.109
  • 3445.x versions prior to 3445.107
  • 3421.x versions prior to 3421.124
  • All other stemcells not listed.
• Cloud Foundry BOSH xenial-stemcells are vulnerable, including:
  • 170.x versions prior to 170.9
  • 97.x versions prior to 97.74
  • All other stemcells not listed.
• All versions of Cloud Foundry cflinuxfs2 prior to 1.278.0
• All versions of Cloud Foundry cflinuxfs3 prior to 0.76.0

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 3586.96
  • Upgrade 3541.x versions to 3541.93
  • Upgrade 3468.x versions to 3468.109
  • Upgrade 3445.x versions to 3445.107
  • Upgrade 3421.x versions to 3421.124
  • 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 170.9
  • Upgrade 97.x versions to 97.74
  • 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 1.278.0 or later.
• The Cloud Foundry project recommends that Cloud Foundry deployments run with cflinuxfs3 version 0.76.0 or later.

References

• USN-3935-1
• CVE-2011-5325
• CVE-2014-9645
• CVE-2015-9261
• CVE-2016-2147
• CVE-2016-2148
• CVE-2017-15873
• CVE-2017-16544
• CVE-2018-1000517
• CVE-2018-20679
• CVE-2019-5747