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Ubuntu 18.10 USN-3832-1 Critical: Linux Kernel AWS Threats

ubuntu
Calendar Grey November 30, 2018
Dist Ubuntu Esm H88
Debian's DSA-4876-1 announces patched linux-cloud vulnerabilities, highlighting dangers and prompting upgrades for enhanced security.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

Details:

Jann Horn discovered that the procfs file system implementation in the

Linux kernel did not properly restrict the ability to inspect the kernel

stack of an arbitrary task. A local attacker could use this to expose

sensitive information. (CVE-2018-17972)

Jann Horn discovered that the mremap() system call in the Linux kernel did

not properly flush the TLB when completing, potentially leaving access to a

physical page after it has been released to the page allocator. A local

attacker could use this to cause a denial of service (system crash), expose

sensitive information, or possibly execute arbitrary code. (CVE-2018-18281)

It was discovered that the BPF verifier in the Linux kernel did not

correctly compute numeric bounds in some situations. A local attacker could

use this to cause a denial of service (system crash) or possibly ex...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory information exposure ubuntu system crash execution risk linux-aws

Update Instructions

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

Ubuntu 18.10:
  linux-image-4.18.0-1006-aws     4.18.0-1006.7
  linux-image-aws                 4.18.0.1006.6

After a standard system update you need to reboot your computer to make
all the necessary changes.
XXX MAYBE WITH XXX
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References

https://ubuntu.com/security/notices/USN-3832-1

CVE-2018-17972, CVE-2018-18281, CVE-2018-18445, CVE-2018-18653,

CVE-2018-18955, CVE-2018-6559

Severity
critical
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Critical

November 30, 2018

Topics%20covered

Topics Covered

security advisory information exposure ubuntu system crash execution risk linux-aws

Package Information

https://launchpad.net/ubuntu/+source/linux-aws/4.18.0-1006.7

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