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Ubuntu 11.10 USN-1689-1 Critical: Kernel Crash And Info Leak

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Calendar Grey January 15, 2013
Scroller Ubuntu
Ubuntu Security Notice USN-1690-1 addresses severe vulnerabilities in the kernel, creating potential threats for local menace.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

Jon Howell reported a flaw in the Linux kernel's KVM (Kernel-based virtual

machine) subsystem's handling of the XSAVE feature. On hosts, using qemu

userspace, without the XSAVE feature an unprivileged local attacker could

exploit this flaw to crash the system. (CVE-2012-4461)

A flaw was discovered in the Linux kernel's handling of script execution

when module loading is enabled. A local attacker could exploit this flaw to

cause a leak of kernel stack contents. (CVE-2012-4530)

Topics%20covered

Topics Covered

security advisory information leak critical kernel ubuntu system crash linux

Update Instructions

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

Ubuntu 11.10:
  linux-image-3.0.0-30-generic    3.0.0-30.47
  linux-image-3.0.0-30-generic-pae  3.0.0-30.47
  linux-image-3.0.0-30-omap       3.0.0-30.47
  linux-image-3.0.0-30-powerpc    3.0.0-30.47
  linux-image-3.0.0-30-powerpc-smp  3.0.0-30.47
  linux-image-3.0.0-30-powerpc64-smp  3.0.0-30.47
  linux-image-3.0.0-30-server     3.0.0-30.47
  linux-image-3.0.0-30-virtual    3.0.0-30.47

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-1689-1

CVE-2012-4461, CVE-2012-4530

Severity
critical
Lowest
Low
Medium
High
Critical

January 15, 2013

Topics%20covered

Topics Covered

security advisory information leak critical kernel ubuntu system crash linux

Package Information

https://launchpad.net/ubuntu/+source/linux/3.0.0-30.47

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