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Ubuntu 12.04 LTS USN-1793-1 Critical: Kernel Security Flaws

ubuntu
Calendar Grey April 8, 2013
Scroller Ubuntu
Critical kernel weaknesses identified in Ubuntu 12.04 LTS. Urgent updates required to protect against possible threats.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

Emese Revfy discovered that in the Linux kernel signal handlers could leak

address information across an exec, making it possible to by pass ASLR

(Address Space Layout Randomization). A local user could use this flaw to

by pass ASLR to reliably deliver an exploit payload that would otherwise be

stopped (by ASLR). (CVE-2013-0914)

A memory use after free error was discover in the Linux kernel's tmpfs

filesystem. A local user could exploit this flaw to gain privileges or

cause a denial of service (system crash). (CVE-2013-1767)

Mateusz Guzik discovered a race in the Linux kernel's keyring. A local user

could exploit this flaw to cause a denial of service (system crash).

(CVE-2013-1792)

Mathias Krause discovered a memory leak in the Linux kernel's crypto report

API. A local user with CAP_NET_ADMIN could exploit this leak to examine

some of the kernel's st...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical local exploit memory leak kernel ubuntu ASLR bypass

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-40-generic    3.2.0-40.64
  linux-image-3.2.0-40-generic-pae  3.2.0-40.64
  linux-image-3.2.0-40-highbank   3.2.0-40.64
  linux-image-3.2.0-40-omap       3.2.0-40.64
  linux-image-3.2.0-40-powerpc-smp  3.2.0-40.64
  linux-image-3.2.0-40-powerpc64-smp  3.2.0-40.64
  linux-image-3.2.0-40-virtual    3.2.0-40.64

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-1793-1

CVE-2013-0914, CVE-2013-1767, CVE-2013-1792, CVE-2013-2546,

CVE-2013-2547, CVE-2013-2548

Severity
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April 08, 2013

Topics%20covered

Topics Covered

security advisory critical local exploit memory leak kernel ubuntu ASLR bypass

Package Information

https://launchpad.net/ubuntu/+source/linux/3.2.0-40.64

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