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[USN-1792-1] Linux kernel vulnerabilities

Posted on 09 April 2013
Ubuntu Security

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Ubuntu Security Notice USN-1792-1
April 08, 2013

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

- Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

Mathias Krause discovered several errors in the Linux kernel's xfrm_user
implementation. A local attacker could exploit these flaws to examine par=
ts
of kernel memory. (CVE-2012-6537)

Mathias Krause discovered information leak in the Linux kernel's compat
ioctl interface. A local user could exploit the flaw to examine parts of
kernel stack memory (CVE-2012-6539)

Mathias Krause discovered an information leak in the Linux kernel's
getsockopt for IP_VS_SO_GET_TIMEOUT. A local user could exploit this flaw=

to examine parts of kernel stack memory. (CVE-2012-6540)

Emese Revfy discovered that in the Linux kernel signal handlers could lea=
k
address information across an exec, making it possible to by pass ASLR
(Address Space Layout Randomization). A local user could use this flaw to=

by pass ASLR to reliably deliver an exploit payload that would otherwise =
be
stopped (by ASLR). (CVE-2013-0914)

A memory use after free error was discover in the Linux kernel's tmpfs
filesystem. A local user could exploit this flaw to gain privileges or
cause a denial of service (system crash). (CVE-2013-1767)

Mateusz Guzik discovered a race in the Linux kernel's keyring. A local us=
er
could exploit this flaw to cause a denial of service (system crash).
(CVE-2013-1792)

Update instructions:

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

Ubuntu 10.04 LTS:
linux-image-2.6.32-46-386 2.6.32-46.107
linux-image-2.6.32-46-generic 2.6.32-46.107
linux-image-2.6.32-46-generic-pae 2.6.32-46.107
linux-image-2.6.32-46-ia64 2.6.32-46.107
linux-image-2.6.32-46-lpia 2.6.32-46.107
linux-image-2.6.32-46-powerpc 2.6.32-46.107
linux-image-2.6.32-46-powerpc-smp 2.6.32-46.107
linux-image-2.6.32-46-powerpc64-smp 2.6.32-46.107
linux-image-2.6.32-46-preempt 2.6.32-46.107
linux-image-2.6.32-46-server 2.6.32-46.107
linux-image-2.6.32-46-sparc64 2.6.32-46.107
linux-image-2.6.32-46-sparc64-smp 2.6.32-46.107
linux-image-2.6.32-46-versatile 2.6.32-46.107
linux-image-2.6.32-46-virtual 2.6.32-46.107

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-1792-1
CVE-2012-6537, CVE-2012-6539, CVE-2012-6540, CVE-2013-0914,
CVE-2013-1767, CVE-2013-1792

Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.32-46.107


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