USN-1239-1: Linux kernel (EC2) vulnerabilities

25 October 2011

Several security issues were fixed in the kernel.

Releases

Packages

  • linux-ec2 - Linux kernel for EC2

Details

Ryan Sweat discovered that the kernel incorrectly handled certain VLAN
packets. On some systems, a remote attacker could send specially crafted
traffic to crash the system, leading to a denial of service.
(CVE-2011-1576)

Vasiliy Kulikov and Dan Rosenberg discovered that ecryptfs did not
correctly check the origin of mount points. A local attacker could exploit
this to trick the system into unmounting arbitrary mount points, leading to
a denial of service. (CVE-2011-1833)

Vasiliy Kulikov discovered that taskstats did not enforce access
restrictions. A local attacker could exploit this to read certain
information, leading to a loss of privacy. (CVE-2011-2494)

Vasiliy Kulikov discovered that /proc/PID/io did not enforce access
restrictions. A local attacker could exploit this to read certain
information, leading to a loss of privacy. (CVE-2011-2495)

Dan Rosenberg discovered that the Bluetooth stack incorrectly handled
certain L2CAP requests. If a system was using Bluetooth, a remote attacker
could send specially crafted traffic to crash the system or gain root
privileges. (CVE-2011-2497)

It was discovered that the EXT4 filesystem contained multiple off-by-one
flaws. A local attacker could exploit this to crash the system, leading to
a denial of service. (CVE-2011-2695)

Fernando Gont discovered that the IPv6 stack used predictable fragment
identification numbers. A remote attacker could exploit this to exhaust
network resources, leading to a denial of service. (CVE-2011-2699)

Christian Ohm discovered that the perf command looks for configuration
files in the current directory. If a privileged user were tricked into
running perf in a directory containing a malicious configuration file, an
attacker could run arbitrary commands and possibly gain privileges.
(CVE-2011-2905)

Time Warns discovered that long symlinks were incorrectly handled on Be
filesystems. A local attacker could exploit this with a malformed Be
filesystem and crash the system, leading to a denial of service.
(CVE-2011-2928)

Dan Kaminsky discovered that the kernel incorrectly handled random sequence
number generation. An attacker could use this flaw to possibly predict
sequence numbers and inject packets. (CVE-2011-3188)

Darren Lavender discovered that the CIFS client incorrectly handled certain
large values. A remote attacker with a malicious server could exploit this
to crash the system or possibly execute arbitrary code as the root user.
(CVE-2011-3191)

Han-Wen Nienhuys reported a flaw in the FUSE kernel module. A local user
who can mount a FUSE file system could cause a denial of service.
(CVE-2011-3353)

Gideon Naim discovered a flaw in the Linux kernel's handling VLAN 0 frames.
An attacker on the local network could exploit this flaw to cause a denial
of service. (CVE-2011-3593)

Update instructions

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

Ubuntu 10.04

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.

Related notices

  • USN-1188-1: ecryptfs-utils
  • USN-1202-1: linux-ti-omap4, linux-image-2.6.35-903-omap4
  • USN-1204-1: linux-image-2.6.31-610-imx51, linux-fsl-imx51
  • USN-1211-1: linux-image-2.6.38-11-omap, linux-image-2.6.38-11-powerpc-smp, linux, linux-image-2.6.38-11-virtual, linux-image-2.6.38-11-generic-pae, linux-image-2.6.38-11-powerpc64-smp, linux-image-2.6.38-11-powerpc, linux-image-2.6.38-11-generic, linux-image-2.6.38-11-server, linux-image-2.6.38-11-versatile
  • USN-1212-1: linux-ti-omap4, linux-image-2.6.38-1209-omap4
  • USN-1219-1: linux-lts-backport-maverick, linux-image-2.6.35-30-generic, linux-image-2.6.35-30-generic-pae, linux-image-2.6.35-30-virtual, linux-image-2.6.35-30-server
  • USN-1220-1: linux-ti-omap4, linux-image-2.6.35-903-omap4
  • USN-1225-1: linux-image-2.6.24-29-xen, linux-image-2.6.24-29-mckinley, linux-image-2.6.24-29-powerpc64-smp, linux-image-2.6.24-29-lpia, linux-image-2.6.24-29-server, linux-image-2.6.24-29-powerpc, linux-image-2.6.24-29-itanium, linux, linux-image-2.6.24-29-hppa32, linux-image-2.6.24-29-lpiacompat, linux-image-2.6.24-29-hppa64, linux-image-2.6.24-29-generic, linux-image-2.6.24-29-386, linux-image-2.6.24-29-sparc64, linux-image-2.6.24-29-rt, linux-image-2.6.24-29-sparc64-smp, linux-image-2.6.24-29-virtual, linux-image-2.6.24-29-openvz, linux-image-2.6.24-29-powerpc-smp
  • USN-1227-1: linux-image-2.6.35-30-powerpc, linux-image-2.6.35-30-powerpc64-smp, linux, linux-image-2.6.35-30-generic, linux-image-2.6.35-30-generic-pae, linux-image-2.6.35-30-omap, linux-image-2.6.35-30-powerpc-smp, linux-image-2.6.35-30-virtual, linux-image-2.6.35-30-versatile, linux-image-2.6.35-30-server
  • USN-1228-1: linux-ti-omap4, linux-image-2.6.38-1209-omap4
  • USN-1236-1: linux-image-2.6.24-29-xen, linux-image-2.6.24-29-mckinley, linux-image-2.6.24-29-powerpc64-smp, linux-image-2.6.24-29-lpia, linux-image-2.6.24-29-server, linux-image-2.6.24-29-powerpc, linux-image-2.6.24-29-itanium, linux, linux-image-2.6.24-29-hppa32, linux-image-2.6.24-29-lpiacompat, linux-image-2.6.24-29-hppa64, linux-image-2.6.24-29-generic, linux-image-2.6.24-29-386, linux-image-2.6.24-29-sparc64, linux-image-2.6.24-29-rt, linux-image-2.6.24-29-sparc64-smp, linux-image-2.6.24-29-virtual, linux-image-2.6.24-29-openvz, linux-image-2.6.24-29-powerpc-smp
  • USN-1240-1: linux-mvl-dove, linux-image-2.6.32-219-dove
  • USN-1241-1: linux-fsl-imx51, linux-image-2.6.31-611-imx51
  • USN-1242-1: linux-lts-backport-maverick, linux-image-2.6.35-30-generic, linux-image-2.6.35-30-generic-pae, linux-image-2.6.35-30-virtual, linux-image-2.6.35-30-server
  • USN-1243-1: linux-image-2.6.35-30-powerpc, linux-image-2.6.35-30-powerpc64-smp, linux, linux-image-2.6.35-30-generic, linux-image-2.6.35-30-generic-pae, linux-image-2.6.35-30-omap, linux-image-2.6.35-30-powerpc-smp, linux-image-2.6.35-30-virtual, linux-image-2.6.35-30-versatile, linux-image-2.6.35-30-server
  • USN-1244-1: linux-ti-omap4, linux-image-2.6.35-903-omap4
  • USN-1245-1: linux-mvl-dove, linux-image-2.6.32-419-dove
  • USN-1246-1: linux-image-2.6.38-12-generic-pae, linux, linux-image-2.6.38-12-powerpc-smp, linux-image-2.6.38-12-versatile, linux-image-2.6.38-12-virtual, linux-image-2.6.38-12-server, linux-image-2.6.38-12-omap, linux-image-2.6.38-12-powerpc, linux-image-2.6.38-12-powerpc64-smp, linux-image-2.6.38-12-generic
  • USN-1253-1: linux-image-2.6.32-35-versatile, linux-image-2.6.32-35-powerpc-smp, linux-image-2.6.32-35-powerpc64-smp, linux, linux-image-2.6.32-35-sparc64-smp, linux-image-2.6.32-35-386, linux-image-2.6.32-35-lpia, linux-image-2.6.32-35-ia64, linux-image-2.6.32-35-sparc64, linux-image-2.6.32-35-virtual, linux-image-2.6.32-35-powerpc, linux-image-2.6.32-35-server, linux-image-2.6.32-35-preempt, linux-image-2.6.32-35-generic-pae, linux-image-2.6.32-35-generic
  • USN-1256-1: linux-image-2.6.38-12-generic-pae, linux-image-2.6.38-12-virtual, linux-lts-backport-natty, linux-image-2.6.38-12-server, linux-image-2.6.38-12-generic
  • USN-1260-1: linux-ti-omap4, linux-image-3.0.0-1206-omap4
  • USN-1275-1: linux-image-3.0.0-13-powerpc64-smp, linux-image-3.0.0-13-powerpc, linux, linux-image-3.0.0-13-virtual, linux-image-3.0.0-13-omap, linux-image-3.0.0-13-generic, linux-image-3.0.0-13-powerpc-smp, linux-image-3.0.0-13-generic-pae, linux-image-3.0.0-13-server
  • USN-1279-1: linux-image-2.6.38-13-generic, linux-image-2.6.38-13-generic-pae, linux-image-2.6.38-13-virtual, linux-image-2.6.38-13-server, linux-lts-backport-natty
  • USN-1281-1: linux-ti-omap4, linux-image-2.6.38-1209-omap4
  • USN-1285-1: linux-image-2.6.38-13-generic, linux-image-2.6.38-13-powerpc64-smp, linux, linux-image-2.6.38-13-generic-pae, linux-image-2.6.38-13-virtual, linux-image-2.6.38-13-server, linux-image-2.6.38-13-powerpc-smp, linux-image-2.6.38-13-powerpc, linux-image-2.6.38-13-omap, linux-image-2.6.38-13-versatile
  • USN-1294-1: linux-image-3.0.0-13-virtual, linux-lts-backport-oneiric, linux-image-3.0.0-13-generic, linux-image-3.0.0-13-generic-pae, linux-image-3.0.0-13-server
  • USN-1325-1: linux-ti-omap4, linux-image-2.6.35-903-omap4
  • USN-1329-1: linux-ti-omap4, linux-image-2.6.38-1209-omap4
  • USN-1361-1: linux-image-2.6.35-32-omap, linux-image-2.6.35-32-powerpc-smp, linux-image-2.6.35-32-generic-pae, linux, linux-image-2.6.35-32-powerpc64-smp, linux-image-2.6.35-32-server, linux-image-2.6.35-32-versatile, linux-image-2.6.35-32-powerpc, linux-image-2.6.35-32-virtual, linux-image-2.6.35-32-generic
  • USN-1362-1: linux-image-2.6.38-13-generic, linux-image-2.6.38-13-powerpc64-smp, linux, linux-image-2.6.38-13-generic-pae, linux-image-2.6.38-13-virtual, linux-image-2.6.38-13-server, linux-image-2.6.38-13-powerpc-smp, linux-image-2.6.38-13-powerpc, linux-image-2.6.38-13-omap, linux-image-2.6.38-13-versatile
  • USN-1386-1: linux-image-2.6.38-13-generic, linux-image-2.6.38-13-generic-pae, linux-image-2.6.38-13-virtual, linux-image-2.6.38-13-server, linux-lts-backport-natty
  • USN-1387-1: linux-image-2.6.35-32-generic-pae, linux-image-2.6.35-32-server, linux-image-2.6.35-32-virtual, linux-image-2.6.35-32-generic, linux-lts-backport-maverick