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Ubuntu 10.04 LTS USN-1776-1 Critical: Kernel Exploits and Threats

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Calendar Grey March 22, 2013
Scroller Ubuntu
The Ubuntu Security Notice USN-2458-1 highlights severe vulnerabilities in the kernel, posing threats of unauthorized access and potential system instability.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-ec2: Linux kernel for EC2

Details:

A flaw was reported in the permission checks done by the Linux kernel for

/dev/cpu/*/msr. A local root user with all capabilities dropped could

exploit this flaw to execute code with full root capabilities.

(CVE-2013-0268)

A flaw was discovered in the Linux kernels handling of memory ranges with

PROT_NONE when transparent hugepages are in use. An unprivileged local user

could exploit this flaw to cause a denial of service (crash the system).

(CVE-2013-0309)

A flaw was discovered on the Linux kernel's VFAT filesystem driver when a

disk is mounted with the utf8 option (this is the default on Ubuntu). On a

system where disks/images can be auto-mounted or a FAT filesystem is

mounted an unprivileged user can exploit the flaw to gain root privileges.

(CVE-2013-1773)

Topics%20covered

Topics Covered

security advisory denial of service critical remote code execution kernel ubuntu linux-ec2

Update Instructions

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

Ubuntu 10.04 LTS:
  linux-image-2.6.32-351-ec2      2.6.32-351.62

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

https://ubuntu.com/security/notices/USN-1776-1

CVE-2013-0268, CVE-2013-0309, CVE-2013-1773

Severity
critical
Lowest
Low
Medium
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Critical

March 22, 2013

Topics%20covered

Topics Covered

security advisory denial of service critical remote code execution kernel ubuntu linux-ec2

Package Information

https://launchpad.net/ubuntu/+source/linux-ec2/2.6.32-351.62

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