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Ubuntu Security Notice USN-2631-1

Ubuntu Security Notice USN-2631-1
Posted Jun 10, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2631-1 - Jan Beulich discovered the Xen virtual machine subsystem of the Linux kernel did not properly restrict access to PCI command registers. A local guest user could exploit this flaw to cause a denial of service (host crash). A privilege escalation was discovered in the fork syscall via the int80 entry on 64 bit kernels with 32 bit emulation support. An unprivileged local attacker could exploit this flaw to increase their privileges on the system. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2015-2150, CVE-2015-2830, CVE-2015-3331, CVE-2015-3636, CVE-2015-4167
SHA-256 | dcf2ecac03d8b8b31c3d14dee7a678bcbea7092733daae8ed72b7b8b585b517f

Ubuntu Security Notice USN-2631-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-2631-1
June 10, 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:

Jan Beulich discovered the Xen virtual machine subsystem of the Linux
kernel did not properly restrict access to PCI command registers. A local
guest user could exploit this flaw to cause a denial of service (host
crash). (CVE-2015-2150)

A privilege escalation was discovered in the fork syscall via the int80
entry on 64 bit kernels with 32 bit emulation support. An unprivileged
local attacker could exploit this flaw to increase their privileges on the
system. (CVE-2015-2830)

A memory corruption issue was discovered in AES decryption when using the
Intel AES-NI accelerated code path. A remote attacker could exploit this
flaw to cause a denial of service (system crash) or potentially escalate
privileges on Intel base machines with AEC-GCM mode IPSec security
association. (CVE-2015-3331)

Wen Xu discovered a use-after-free flaw in the Linux kernel's ipv4 ping
support. A local user could exploit this flaw to cause a denial of service
(system crash) or gain administrative privileges on the system.
(CVE-2015-3636)

Carl H Lunde discovered missing sanity checks in the the Linux kernel's UDF
file system (CONFIG_UDF_FS). A local attack could exploit this flaw to cause
a denial of service (system crash) by using a corrupted filesystem image.
(CVE-2015-4167)

Update instructions:

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-85-generic 3.2.0-85.122
linux-image-3.2.0-85-generic-pae 3.2.0-85.122
linux-image-3.2.0-85-highbank 3.2.0-85.122
linux-image-3.2.0-85-omap 3.2.0-85.122
linux-image-3.2.0-85-powerpc-smp 3.2.0-85.122
linux-image-3.2.0-85-powerpc64-smp 3.2.0-85.122
linux-image-3.2.0-85-virtual 3.2.0-85.122

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-2631-1
CVE-2015-2150, CVE-2015-2830, CVE-2015-3331, CVE-2015-3636,
CVE-2015-4167

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.2.0-85.122
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