Severity

High

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 14.04

Description

USN-3582-1 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.

Mohamed Ghannam discovered that the IPv4 raw socket implementation in the Linux kernel contained a race condition leading to uninitialized pointer usage. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. (CVE-2017-17712)

Laurent Guerby discovered that the mbcache feature in the ext2 and ext4 filesystems in the Linux kernel improperly handled xattr block caching. A local attacker could use this to cause a denial of service. (CVE-2015-8952)

Vitaly Mayatskikh discovered that the SCSI subsystem in the Linux kernel did not properly track reference counts when merging buffers. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2017-12190)

ChunYu Wang discovered that a use-after-free vulnerability existed in the SCTP protocol implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code, (CVE-2017-15115)

Mohamed Ghannam discovered a use-after-free vulnerability in the DCCP protocol implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-8824)

USN-3540-2 mitigated CVE-2017-5715 (Spectre Variant 2) for the amd64 architecture in Ubuntu 14.04 LTS. This update provides the compiler-based retpoline kernel mitigation for the amd64 and i386 architectures. Original advisory details:

Jann Horn discovered that microprocessors utilizing speculative execution and branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Spectre. A local attacker could use this to expose sensitive information, including kernel memory. (CVE-2017-5715)

Affected Cloud Foundry Products and Versions

Severity is high unless otherwise noted.

• Cloud Foundry BOSH stemcells are vulnerable, including:
  • 3363.x versions prior to 3363.50
  • 3421.x versions prior to 3421.42
  • 3445.x versions prior to 3445.28
  • 3468.x versions prior to 3468.25
  • 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 3363.x versions to 3363.50
  • Upgrade 3421.x versions to 3421.42
  • Upgrade 3445.x versions to 3445.28
  • Upgrade 3468.x versions to 3468.25
  • All other stemcells should be upgraded to the latest version available on bosh.io.

References

• USN-3582-2
• CVE-2017-17712
• CVE-2015-8952
• CVE-2017-12190
• CVE-2017-15115
• CVE-2017-8824
• CVE-2017-5715