Ubuntu Security Notice USN-2544-1

24th March, 2015

linux vulnerabilities

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

• Ubuntu 14.04 LTS

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 local user could exploit this flaw to load installed
kernel modules, increasing the attack surface and potentially using this to
gain administrative privileges. (CVE-2014-9644)

Carl H Lunde discovered that the UDF file system (CONFIG_UDF_FS) failed to
verify symlink size info. A local attacker, who is able to mount a malicous
UDF file system image, could exploit this flaw to cause a denial of service
(system crash) or possibly cause other undesired behaviors. (CVE-2014-9728)

Carl H Lunde discovered that the UDF file system (CONFIG_UDF_FS) did not
valid inode size information . A local attacker, who is able to mount a
malicous UDF file system image, could exploit this flaw to cause a denial
of service (system crash) or possibly cause other undesired behaviors.
(CVE-2014-9729)

Carl H Lunde discovered that the UDF file system (CONFIG_UDF_FS) did not
correctly verify the component length for symlinks. A local attacker, who
is able to mount a malicous UDF file system image, could exploit this flaw
to cause a denial of service (system crash) or possibly cause other
undesired behaviors. (CVE-2014-9730)

Carl H Lunde discovered an information leak in the UDF file system
(CONFIG_UDF_FS). A local attacker, who is able to mount a malicous UDF file
system image, could exploit this flaw to read potential sensitve kernel
memory. (CVE-2014-9731)

Update instructions

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

Ubuntu 14.04 LTS:

linux-image-3.13.0-48-powerpc-smp 3.13.0-48.80

linux-image-3.13.0-48-powerpc-e500mc 3.13.0-48.80

linux-image-3.13.0-48-generic-lpae 3.13.0-48.80

linux-image-3.13.0-48-powerpc-e500 3.13.0-48.80

linux-image-3.13.0-48-generic 3.13.0-48.80

linux-image-3.13.0-48-powerpc64-smp 3.13.0-48.80

linux-image-3.13.0-48-lowlatency 3.13.0-48.80

linux-image-3.13.0-48-powerpc64-emb 3.13.0-48.80

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

CVE-2013-7421, CVE-2014-7822, CVE-2014-9644, CVE-2014-9728, CVE-2014-9729, CVE-2014-9730, CVE-2014-9731, CVE-2015-0274