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[USN-2289-1] Linux kernel vulnerabilities

Posted on 17 July 2014
Ubuntu Security

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Ubuntu Security Notice USN-2289-1
July 17, 2014

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

- Ubuntu 13.10

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

Sasha Levin reported a flaw in the Linux kernel's point-to-point protocol=

(PPP) when used with the Layer Two Tunneling Protocol (L2TP). A local use=
r
could exploit this flaw to gain administrative privileges. (CVE-2014-4943=
)

Michael S. Tsirkin discovered an information leak in the Linux kernel's
segmentation of skbs when using the zerocopy feature of vhost-net. A loca=
l
attacker could exploit this flaw to gain potentially sensitive informatio=
n
from kernel memory. (CVE-2014-0131)

A flaw was discovered in the Linux kernel's audit subsystem when auditing=

certain syscalls. A local attacker could exploit this flaw to obtain
potentially sensitive single-bit values from kernel memory or cause a
denial of service (OOPS). (CVE-2014-3917)

A flaw was discovered in the Linux kernel's implementation of user
namespaces with respect to inode permissions. A local user could exploit
this flaw by creating a user namespace to gain administrative privileges.=

(CVE-2014-4014)

Don Bailey discovered a flaw in the LZO decompress algorithm used by the
Linux kernel. An attacker could exploit this flaw to cause a denial of
service (memory corruption or OOPS). (CVE-2014-4608)

Don Bailey and Ludvig Strigeus discovered an integer overflow in the Linu=
x
kernel's implementation of the LZ4 decompression algorithm, when used by
code not complying with API limitations. An attacker could exploit this
flaw to cause a denial of service (memory corruption) or possibly other
unspecified impact. (CVE-2014-4611)

Update instructions:

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

Ubuntu 13.10:
linux-image-3.11.0-26-generic 3.11.0-26.45
linux-image-3.11.0-26-generic-lpae 3.11.0-26.45

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 automaticall=
y
perform this as well.

References:
http://www.ubuntu.com/usn/usn-2289-1
CVE-2014-0131, CVE-2014-3917, CVE-2014-4014, CVE-2014-4608,
CVE-2014-4611, CVE-2014-4943

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.11.0-26.45

 

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