Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 14.04

Description

USN-3676-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS.

Wen Xu discovered that the ext4 filesystem implementation in the Linux kernel did not properly handle corrupted meta data in some situations. An attacker could use this to specially craft an ext4 file system that caused a denial of service (system crash) when mounted. (CVE-2018-1092, CVE-2018-1093)

It was discovered that the cdrom driver in the Linux kernel contained an incorrect bounds check. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-10940)

It was discovered that the 802.11 software simulator implementation in the Linux kernel contained a memory leak when handling certain error conditions. A local attacker could possibly use this to cause a denial of service (memory exhaustion). (CVE-2018-8087)

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

• Cloud Foundry BOSH stemcells are vulnerable, including:
  • 3586.x versions prior to 3586.23
  • 3541.x versions prior to 3541.34
  • 3468.x versions prior to 3468.51
  • 3445.x versions prior to 3445.51
  • 3421.x versions prior to 3421.66
  • 3363.x versions prior to 3363.65
  • All other stemcells not listed.

Mitigation

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

• The Cloud Foundry project recommends upgrading the following BOSH stemcells:
  • Upgrade 3586.x versions to 3586.23
  • Upgrade 3541.x versions to 3541.34
  • Upgrade 3468.x versions to 3468.51
  • Upgrade 3445.x versions to 3445.51
  • Upgrade 3421.x versions to 3421.66
  • Upgrade 3363.x versions to 3363.65
  • All other stemcells should be upgraded to the latest version available on bosh.io.

References

• USN-3676-2
• CVE-2018-1092
• CVE-2018-1093
• CVE-2018-10940
• CVE-2018-8087