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USN-3696-2: Linux kernel (Xenial HWE) vulnerabilities


Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected
  • Canonical Ubuntu 14.04
Description

USN-3696-1 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.

It was discovered that an integer overflow existed in the perf subsystem of the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2017-18255)

Wei Fang discovered an integer overflow in the F2FS filesystem implementation in the Linux kernel. A local attacker could use this to cause a denial of service. (CVE-2017-18257)

It was discovered that an information leak existed in the generic SCSI driver in the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-1000204)

It was discovered that the wait4() system call in the Linux kernel did not properly validate its arguments in some situations. A local attacker could possibly use this to cause a denial of service. (CVE-2018-10087)

It was discovered that the kill() system call implementation in the Linux kernel did not properly validate its arguments in some situations. A local attacker could possibly use this to cause a denial of service. (CVE-2018-10124)

Julian Stecklina and Thomas Prescher discovered that FPU register states (such as MMX, SSE, and AVX registers) which are lazily restored are potentially vulnerable to a side channel attack. A local attacker could use this to expose sensitive information. (CVE-2018-3665)

Jakub Jirasek discovered that multiple use-after-errors existed in the USB/IP 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-2018-5814)

It was discovered that an information leak vulnerability existed in the floppy driver in the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-7755)

Seunghun Han discovered an information leak in the ACPI handling code in the Linux kernel when handling early termination of ACPI table loading. A local attacker could use this to expose sensitive informal (kernel address locations). (CVE-2017-13695)

It was discovered that a memory leak existed in the Serial Attached SCSI (SAS) implementation in the Linux kernel. A physically proximate attacker could use this to cause a denial of service (memory exhaustion). (CVE-2018-10021)

CVEs contained in this USN include: CVE-2017-13695, CVE-2017-18255, CVE-2017-18257, CVE-2018-1000204, CVE-2018-1000204, CVE-2018-10021, CVE-2018-10087, CVE-2018-10124, CVE-2018-3665, CVE-2018-5814, CVE-2018-7755

Affected Pivotal Products and Versions

Severity is medium unless otherwise noted.

  • Vulnerable Cloud Foundry components individually listed here.
  • Impacted stemcells may be updated independently of upgrading Pivotal Application Service or PCF Isolation Segment.
  • Pivotal Application Service includes vulnerable stemcells and container rootfs in the following releases:
    • 2.2.x versions prior to 2.2.3
    • 2.1.x versions prior to 2.1.10
    • 2.0.x versions prior to 2.0.19
  • PCF Isolation Segment includes vulnerable stemcells and container rootfs in the following releases:
    • 2.2.x versions prior to 2.2.3
    • 2.1.x versions prior to 2.1.9
    • 2.0.x versions prior to 2.0.15
  • Pivotal Operations Manager is vulnerable in the following releases:
    • 2.2.x versions prior to 2.2.1
    • 2.1.x versions prior to 2.1.9
    • 2.0.x versions prior to 2.0.18
Mitigation

Users of affected versions should apply the following mitigation:

  • The Cloud Foundry security team recommends upgrading BOSH stemcells and/or other OSS components listed here if applicable.
  • Upgrade Pivotal products that use earlier versions of CF components to new Pivotal releases using new versions linked above. On the Pivotal Network product page for each release, check the Depends On section and/or Release Notes for this information.
  • Releases that have fixed this issue include:
    • Pivotal Application Service: 2.2.3, 2.1.10, 2.0.19
    • PCF Isolation Segment: 2.2.3, 2.1.9, 2.0.15
    • Pivotal Operations Manager: 2.2.1, 2.1.9, 2.0.18
References