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Ubuntu 14.04 LTS USN-2544-1 Critical: Kernel Access Issues

ubuntu
Calendar Grey March 24, 2015
Dist Ubuntu Esm H88
Critical patches addressing kernel vulnerabilities in Ubuntu 14.04 LTS enhance defense mechanisms against attacks and maintain overall system stability.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

Eric Windisch discovered flaw in how the Linux kernel's XFS file system

replaces remote attributes. A local access with access to an XFS file

system could exploit this flaw to escalate their privileges.

(CVE-2015-0274)

A flaw was discovered in the automatic loading of modules in the crypto

subsystem of the Linux kernel. A local user could exploit this flaw to load

installed kernel modules, increasing the attack surface and potentially

using this to gain administrative privileges. (CVE-2013-7421)

The Linux kernel's splice system call did not correctly validate its

parameters. A local, unprivileged user could exploit this flaw to cause a

denial of service (system crash). (CVE-2014-7822)

A flaw was discovered in the crypto subsystem when screening module names

for automatic module loading if the name contained a valid crypto module

name, eg. vfat(aes). A...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical access control exploit Ubuntu kernel access

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-3.13.0-48-generic   3.13.0-48.80
  linux-image-3.13.0-48-generic-lpae  3.13.0-48.80
  linux-image-3.13.0-48-lowlatency  3.13.0-48.80
  linux-image-3.13.0-48-powerpc-e500  3.13.0-48.80
  linux-image-3.13.0-48-powerpc-e500mc  3.13.0-48.80
  linux-image-3.13.0-48-powerpc-smp  3.13.0-48.80
  linux-image-3.13.0-48-powerpc64-emb  3.13.0-48.80
  linux-image-3.13.0-48-powerpc64-smp  3.13.0-48.80

After a standard system update you need to reboot your computer to make
all the necessary changes.

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. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References

https://ubuntu.com/security/notices/USN-2544-1

CVE-2013-7421, CVE-2014-7822, CVE-2014-9644, CVE-2015-0274

Severity
critical
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Critical

March 24, 2015

Topics%20covered

Topics Covered

security advisory denial of service critical access control exploit Ubuntu kernel access

Package Information

https://launchpad.net/ubuntu/+source/linux/3.13.0-48.80

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