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Ubuntu 14.04 LTS: USN-3655-1 Critical: Kernel DoS and Information Exposure

ubuntu
Calendar Grey May 22, 2018
Scroller Ubuntu
Ubuntu Security Notice USN-3655-1 May 22, 2018 linux vulnerabilities A security issue affects these
Several security issues were addressed in the Linux kernel.

Summary

Several security issues were addressed in the Linux kernel.

Software Description:

- linux: Linux kernel

Details:

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-...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory buffer overflow critical doS memory leak kernel ubuntu

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-3.13.0-149-generic  3.13.0-149.199
  linux-image-3.13.0-149-generic-lpae  3.13.0-149.199
  linux-image-3.13.0-149-lowlatency  3.13.0-149.199
  linux-image-3.13.0-149-powerpc-e500  3.13.0-149.199
  linux-image-3.13.0-149-powerpc-e500mc  3.13.0-149.199
  linux-image-3.13.0-149-powerpc-smp  3.13.0-149.199
  linux-image-3.13.0-149-powerpc64-emb  3.13.0-149.199
  linux-image-3.13.0-149-powerpc64-smp  3.13.0-149.199
  linux-image-generic             3.13.0.149.159
  linux-image-generic-lpae        3.13.0.149.159
  linux-image-lowlatency          3.13.0.149.159
  linux-image-powerpc-e500        3.13.0.149.159
  linux-image-powerpc-e500mc      3.13.0.149.159
  linux-image-powerpc-smp         3.13.0.149.159
  linux-image-powerpc64-emb       3.13.0.149.159
  linux-image-powerpc64-smp       3.13.0.149.159

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 and Ubuntu is working with Intel to
provide future microcode updates. Ubuntu users with a processor from
a different vendor should contact the vendor to identify necessary
firmware updates. Ubuntu provided corresponding QEMU updates for users
of self-hosted virtual environments in USN 3651-1. 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://ubuntu.com/security/notices/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

Severity
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May 22, 2018

Topics%20covered

Topics Covered

security advisory buffer overflow critical doS memory leak kernel ubuntu

Package Information

https://launchpad.net/ubuntu/+source/linux/3.13.0-149.199

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