USN-1756-1: Linux kernel vulnerabilities
6 March 2013
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.10
Several security issues were fixed in the kernel.
- linux - Linux kernel
A failure to validate input was discovered in the Linux kernel’s Xen netback (network backend) driver. A user in a guest OS may exploit this flaw to cause a denial of service to the guest OS and other guest domains. (CVE-2013-0216)
A memory leak was discovered in the Linux kernel’s Xen netback (network backend) driver. A user in a guest OS could trigger this flaw to cause a denial of service on the system. (CVE-2013-0217)
Andrew Jones discovered a flaw with the xen_iret function in Linux kernel’s Xen virtualizeation. In the 32-bit Xen paravirt platform an unprivileged guest OS user could exploit this flaw to cause a denial of service (crash the system) or gain guest OS privilege. (CVE-2013-0228)
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 kernel’s vhost driver used to accelerate guest networking in KVM based virtual machines. A privileged guest user could exploit this flaw to crash the host system. (CVE-2013-0311)
An information leak was discovered in the Linux kernel’s Bluetooth stack when HIDP (Human Interface Device Protocol) support is enabled. A local unprivileged user could exploit this flaw to cause an information leak from the kernel. (CVE-2013-0349)
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)
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 11.10
- linux-image-3.0.0-32-generic - 3.0.0-32.50
- linux-image-3.0.0-32-generic-pae - 3.0.0-32.50
- linux-image-3.0.0-32-omap - 3.0.0-32.50
- linux-image-3.0.0-32-powerpc - 3.0.0-32.50
- linux-image-3.0.0-32-powerpc-smp - 3.0.0-32.50
- linux-image-3.0.0-32-powerpc64-smp - 3.0.0-32.50
- linux-image-3.0.0-32-server - 3.0.0-32.50
- linux-image-3.0.0-32-virtual - 3.0.0-32.50
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
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.