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[USN-2334-1] Linux kernel vulnerabilities

Posted on 02 September 2014
Ubuntu Security

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Ubuntu Security Notice USN-2334-1
September 02, 2014

linux vulnerabilities
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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:

An flaw was discovered in the Linux kernel's audit subsystem when auditin=
g
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)

An information leak was discovered in the rd_mcp backend of the iSCSI
target subsystem in the Linux kernel. A local user could exploit this fla=
w
to obtain sensitive information from ramdisk_mcp memory by leveraging
access to a SCSI initiator. (CVE-2014-4027)

Sasha Levin reported an issue with the Linux kernel's shared memory
subsystem when used with range notifications and hole punching. A local
user could exploit this flaw to cause a denial of service. (CVE-2014-4171=
)

Toralf F=C3=B6rster reported an error in the Linux kernels syscall auditi=
ng on
32 bit x86 platforms. A local user could exploit this flaw to cause a
denial of service (OOPS and system crash). (CVE-2014-4508)

An information leak was discovered in the control implemenation of the
Advanced Linux Sound Architecture (ALSA) subsystem in the Linux kernel. A=

local user could exploit this flaw to obtain sensitive information from
kernel memory. (CVE-2014-4652)

A use-after-free flaw was discovered in the Advanced Linux Sound
Architecture (ALSA) control implementation of the Linux kernel. A local
user could exploit this flaw to cause a denial of service (system crash).=

(CVE-2014-4653)

A authorization bug was discovered with the snd_ctl_elem_add function of
the Advanced Linux Sound Architecture (ALSA) in the Linux kernel. A local=

user could exploit his bug to cause a denial of service (remove kernel
controls). (CVE-2014-4654)

A flaw discovered in how the snd_ctl_elem function of the Advanced Linux
Sound Architecture (ALSA) handled a reference count. A local user could
exploit this flaw to cause a denial of service (integer overflow and limi=
t
bypass). (CVE-2014-4655)

An integer overflow flaw was discovered in the control implementation of
the Advanced Linux Sound Architecture (ALSA). A local user could exploit
this flaw to cause a denial of service (system crash). (CVE-2014-4656)

An integer underflow flaw was discovered in the Linux kernel's handling o=
f
the backlog value for certain SCTP packets. A remote attacker could explo=
it
this flaw to cause a denial of service (socket outage) via a crafted SCTP=

packet. (CVE-2014-4667)

Jason Gunthorpe reported a flaw with SCTP authentication in the Linux
kernel. A remote attacker could exploit this flaw to cause a denial of
service (NULL pointer dereference and OOPS). (CVE-2014-5077)

Update instructions:

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-68-generic 3.2.0-68.102
linux-image-3.2.0-68-generic-pae 3.2.0-68.102
linux-image-3.2.0-68-highbank 3.2.0-68.102
linux-image-3.2.0-68-omap 3.2.0-68.102
linux-image-3.2.0-68-powerpc-smp 3.2.0-68.102
linux-image-3.2.0-68-powerpc64-smp 3.2.0-68.102
linux-image-3.2.0-68-virtual 3.2.0-68.102

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-2334-1
CVE-2014-3917, CVE-2014-4027, CVE-2014-4171, CVE-2014-4508,
CVE-2014-4652, CVE-2014-4653, CVE-2014-4654, CVE-2014-4655,
CVE-2014-4656, CVE-2014-4667, CVE-2014-5077

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.2.0-68.102

 

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