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Ubuntu Security Notice USN-1696-2

Ubuntu Security Notice USN-1696-2
Posted Feb 2, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1696-2 - USN-1696-1 fixed vulnerabilities in the Linux kernel. Due to an unrelated regression inotify/fanotify stopped working after upgrading. This update fixes the problem. 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. Florian Weimer discovered that hypervkvpd, which is distributed in the Linux kernel, was not correctly validating source addresses of netlink packets. An untrusted local user can cause a denial of service by causing hypervkvpd to exit. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2012-4461, CVE-2012-4530, CVE-2012-5532
SHA-256 | e408a3102f01f5fccf4da6ee68f082b7cb946810d6adaf4f91a34a0cd7d733ac

Ubuntu Security Notice USN-1696-2

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-1696-2
February 01, 2013

linux regression
============================================================================

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

- Ubuntu 12.04 LTS

Summary:

USN-1696-1 introduced a regression in the Linux kernel.

Software Description:
- linux: Linux kernel

Details:

USN-1696-1 fixed vulnerabilities in the Linux kernel. Due to an unrelated
regression inotify/fanotify stopped working after upgrading. This update
fixes the problem.

We apologize for the inconvenience.

Original advisory 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)

Florian Weimer discovered that hypervkvpd, which is distributed in the
Linux kernel, was not correctly validating source addresses of netlink
packets. An untrusted local user can cause a denial of service by causing
hypervkvpd to exit. (CVE-2012-5532)

Update instructions:

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-37-generic 3.2.0-37.58
linux-image-3.2.0-37-generic-pae 3.2.0-37.58
linux-image-3.2.0-37-highbank 3.2.0-37.58
linux-image-3.2.0-37-omap 3.2.0-37.58
linux-image-3.2.0-37-powerpc-smp 3.2.0-37.58
linux-image-3.2.0-37-powerpc64-smp 3.2.0-37.58
linux-image-3.2.0-37-virtual 3.2.0-37.58

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-1696-2
http://www.ubuntu.com/usn/usn-1696-1
https://launchpad.net/bugs/1101666

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.2.0-37.58
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