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USN-1787-1: Linux kernel vulnerabilities

2 April 2013

Several security issues were fixed in the kernel.

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Details

Emese Revfy discovered that in the Linux kernel signal handlers could leak
address information across an exec, making it possible to by pass ASLR
(Address Space Layout Randomization). A local user could use this flaw to
by pass ASLR to reliably deliver an exploit payload that would otherwise be
stopped (by ASLR). (CVE-2013-0914)

A memory use after free error was discover in the Linux kernel's tmpfs
filesystem. A local user could exploit this flaw to gain privileges or
cause a denial of service (system crash). (CVE-2013-1767)

Mateusz Guzik discovered a race in the Linux kernel's keyring. A local user
could exploit this flaw to cause a denial of service (system crash).
(CVE-2013-1792)

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

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

Ubuntu 11.10

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

Related notices

  • USN-1788-1: linux-image-3.0.0-32-server, linux-lts-backport-oneiric, linux-image-3.0.0-32-generic-pae, linux-image-3.0.0-32-generic, linux-image-3.0.0-32-virtual
  • USN-1794-1: linux-image-3.2.0-1429-omap4, linux-ti-omap4
  • USN-1793-1: linux-image-3.2.0-40-omap, linux, linux-image-3.2.0-40-powerpc64-smp, linux-image-3.2.0-40-generic-pae, linux-image-3.2.0-40-generic, linux-image-3.2.0-40-powerpc-smp, linux-image-3.2.0-40-virtual, linux-image-3.2.0-40-highbank
  • USN-1798-1: linux-image-2.6.32-351-ec2, linux-ec2
  • USN-1796-1: linux, linux-image-3.5.0-27-generic, linux-image-3.5.0-27-highbank, linux-image-3.5.0-27-powerpc-smp, linux-image-3.5.0-27-powerpc64-smp, linux-image-3.5.0-27-omap
  • USN-1792-1: linux-image-2.6.32-46-powerpc64-smp, linux-image-2.6.32-46-virtual, linux, linux-image-2.6.32-46-server, linux-image-2.6.32-46-preempt, linux-image-2.6.32-46-lpia, linux-image-2.6.32-46-sparc64, linux-image-2.6.32-46-versatile, linux-image-2.6.32-46-sparc64-smp, linux-image-2.6.32-46-generic, linux-image-2.6.32-46-powerpc-smp, linux-image-2.6.32-46-ia64, linux-image-2.6.32-46-386, linux-image-2.6.32-46-generic-pae, linux-image-2.6.32-46-powerpc
  • USN-1795-1: linux-image-3.5.0-27-generic, linux-lts-quantal
  • USN-1797-1: linux-ti-omap4, linux-image-3.5.0-222-omap4

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