[USN-2541-1] Linux kernel vulnerabilities

John Johansen john.johansen at canonical.com
Tue Mar 24 09:29:51 UTC 2015


==========================================================================
Ubuntu Security Notice USN-2541-1
March 24, 2015

linux vulnerabilities
==========================================================================

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

- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

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 how Thread Local Storage (TLS) is handled by the
task switching function in the Linux kernel for x86_64 based machines. A
local user could exploit this flaw to bypass the Address Space Layout
Radomization (ASLR) protection mechanism. (CVE-2014-9419)

Dmitry Chernenkov discovered a buffer overflow in eCryptfs' encrypted file
name decoding. A local unprivileged user could exploit this flaw to cause a
denial of service (system crash) or potentially gain administrative
privileges. (CVE-2014-9683)

Sun Baoliang discovered a use after free flaw in the Linux kernel's SCTP
(Stream Control Transmission Protocol) subsystem during INIT collisions. A
remote attacker could exploit this flaw to cause a denial of service
(system crash) or potentially escalate their privileges on the system.
(CVE-2015-1421)

Update instructions:

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-79-generic    3.2.0-79.115
  linux-image-3.2.0-79-generic-pae  3.2.0-79.115
  linux-image-3.2.0-79-highbank   3.2.0-79.115
  linux-image-3.2.0-79-omap       3.2.0-79.115
  linux-image-3.2.0-79-powerpc-smp  3.2.0-79.115
  linux-image-3.2.0-79-powerpc64-smp  3.2.0-79.115
  linux-image-3.2.0-79-virtual    3.2.0-79.115

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:
  http://www.ubuntu.com/usn/usn-2541-1
  CVE-2014-7822, CVE-2014-9419, CVE-2014-9683, CVE-2015-1421

Package Information:
  https://launchpad.net/ubuntu/+source/linux/3.2.0-79.115


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