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USN-807-1: Linux kernel vulnerabilities

28 July 2009

Linux kernel vulnerabilities

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Releases

Packages

Details

Michael Tokarev discovered that the RTL8169 network driver did not
correctly validate buffer sizes. A remote attacker on the local network
could send specially crafted traffic that would crash the system or
potentially grant elevated privileges. (CVE-2009-1389)

Julien Tinnes and Tavis Ormandy discovered that when executing setuid
processes the kernel did not clear certain personality flags. A local
attacker could exploit this to map the NULL memory page, causing other
vulnerabilities to become exploitable. Ubuntu 6.06 was not affected.
(CVE-2009-1895)

Matt T. Yourst discovered that KVM did not correctly validate the
page table root. A local attacker could exploit this to crash the
system, leading to a denial of service. Ubuntu 6.06 was not affected.
(CVE-2009-2287)

Ramon de Carvalho Valle discovered that eCryptfs did not correctly
validate certain buffer sizes. A local attacker could create specially
crafted eCryptfs files to crash the system or gain elevated privileges.
Ubuntu 6.06 was not affected. (CVE-2009-2406, CVE-2009-2407)

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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 9.04
Ubuntu 8.10
Ubuntu 8.04
Ubuntu 6.06

After a standard system upgrade you need to reboot your computer to
effect the necessary changes.

ATTENTION: Due to an unavoidable ABI change for Ubuntu 9.04 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

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Further reading