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Ubuntu Security Notice USN-1688-1

Ubuntu Security Notice USN-1688-1
Posted Jan 15, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1688-1 - 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. 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. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2012-4461, CVE-2012-4530, CVE-2012-4461, CVE-2012-4530
SHA-256 | 9410264f6fc934cc4b6e55a8421ce6e660fa9a5c59cee780c20d92dcd39b6903

Ubuntu Security Notice USN-1688-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-1688-1
January 15, 2013

linux-lts-backport-oneiric vulnerabilities
============================================================================

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-lts-backport-oneiric: Linux kernel backport from Oneiric

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)

Update instructions:

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

Ubuntu 10.04 LTS:
linux-image-3.0.0-30-generic 3.0.0-30.47~lucid1
linux-image-3.0.0-30-generic-pae 3.0.0-30.47~lucid1
linux-image-3.0.0-30-server 3.0.0-30.47~lucid1
linux-image-3.0.0-30-virtual 3.0.0-30.47~lucid1

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:
http://www.ubuntu.com/usn/usn-1688-1
CVE-2012-4461, CVE-2012-4530

Package Information:
https://launchpad.net/ubuntu/+source/linux-lts-backport-oneiric/3.0.0-30.47~lucid1
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