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==========================================================================
Ubuntu Security Notice USN-3655-2
May 22, 2018

linux-lts-trusty vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 ESM

Summary:

Several security issues were addressed in the Linux kernel.

Software Description:
- linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise
 ESM

Details:

USN-3655-1 fixed vulnerabilities and added mitigations in the Linux
kernel for Ubuntu 14.04 LTS. This update provides the corresponding
updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu
14.04 LTS for Ubuntu 12.04 ESM.

Jann Horn and Ken Johnson discovered that microprocessors utilizing
speculative execution of a memory read may allow unauthorized memory
reads via a sidechannel attack. This flaw is known as Spectre
Variant 4. A local attacker could use this to expose sensitive
information, including kernel memory. (CVE-2018-3639)

Jan H. Schönherr discovered that the Xen subsystem did not properly handle
block IO merges correctly in some situations. An attacker in a guest vm
could use this to cause a denial of service (host crash) or possibly gain
administrative privileges in the host. (CVE-2017-12134)

It was discovered that the Bluetooth HIP Protocol implementation in the
Linux kernel did not properly validate HID connection setup information. An
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2017-13220)

It was discovered that a buffer overread vulnerability existed in the
keyring subsystem of the Linux kernel. A local attacker could possibly use
this to expose sensitive information (kernel memory). (CVE-2017-13305)

It was discovered that the netlink subsystem in the Linux kernel did not
properly restrict observations of netlink messages to the appropriate net
namespace. A local attacker could use this to expose sensitive information
(kernel netlink traffic). (CVE-2017-17449)

It was discovered that a race condition existed in the i8042 serial device
driver implementation in the Linux kernel. A physically proximate attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2017-18079)

It was discovered that a race condition existed in the Device Mapper
component of the Linux kernel. A local attacker could use this to cause a
denial of service (system crash). (CVE-2017-18203)

It was discovered that a race condition existed in the OCFS2 file system
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service (kernel deadlock). (CVE-2017-18204)

It was discovered that an infinite loop could occur in the madvise(2)
implementation in the Linux kernel in certain circumstances. A local
attacker could use this to cause a denial of service (system hang).
(CVE-2017-18208)

Kefeng Wang discovered that a race condition existed in the memory locking
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service. (CVE-2017-18221)

Silvio Cesare discovered a buffer overwrite existed in the NCPFS
implementation in the Linux kernel. A remote attacker controlling a
malicious NCPFS server could use this to cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2018-8822)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 12.04 ESM:
  linux-image-3.13.0-149-generic  3.13.0-149.199~precise1
  linux-image-3.13.0-149-generic-lpae  3.13.0-149.199~precise1
  linux-image-generic-lpae-lts-trusty  3.13.0.149.140
  linux-image-generic-lts-trusty  3.13.0.149.140

Please note that fully mitigating CVE-2018-3639 (Spectre Variant 4)
may require corresponding processor microcode/firmware updates or,
in virtual environments, hypervisor updates. On i386 and amd64
architectures, the SSBD feature is required to enable the kernel
mitigations. BIOS vendors will be making updates available for Intel
processors that implement SSBD. Ubuntu users with a processor from
a different vendor should contact the vendor to identify necessary
firmware updates. Ubuntu users in cloud environments should contact
the cloud provider to confirm that the hypervisor has been updated
to expose the new CPU features to virtual machines.

References:
  https://usn.ubuntu.com/usn/usn-3655-2
  https://usn.ubuntu.com/usn/usn-3655-1
  CVE-2017-12134, CVE-2017-13220, CVE-2017-13305, CVE-2017-17449,
  CVE-2017-18079, CVE-2017-18203, CVE-2017-18204, CVE-2017-18208,
  CVE-2017-18221, CVE-2018-3639, CVE-2018-8822, https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/Variant4


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