[USN-793-1] Linux kernel vulnerabilities
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[USN-793-1] Linux kernel vulnerabilities

Posted 07/01/2009 - 23:44 by David Schnardthorst

Ubuntu Security Notice USN-793-1 July 02, 2009
linux, linux-source-2.6.15 vulnerabilities
CVE-2009-1072, CVE-2009-1184, CVE-2009-1192, CVE-2009-1242,
CVE-2009-1265, CVE-2009-1336, CVE-2009-1337, CVE-2009-1338,
CVE-2009-1360, CVE-2009-1385, CVE-2009-1439, CVE-2009-1630,
CVE-2009-1633, CVE-2009-1914, CVE-2009-1961

A security issue affects the following Ubuntu releases:

  • Ubuntu 6.06 LTS
  • Ubuntu 8.04 LTS
  • Ubuntu 8.10
  • Ubuntu 9.04

This advisory also applies to the corresponding versions of
Kubuntu, Edubuntu, and Xubuntu.

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

Ubuntu 6.06 LTS
Ubuntu 8.04 LTS
Ubuntu 8.10
Ubuntu 9.04

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 8.04 and 8.10,
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.

Details follow:

Igor Zhbanov discovered that NFS clients were able to create device nodes
even when root_squash was enabled. An authenticated remote attacker
could create device nodes with open permissions, leading to a loss of
privacy or escalation of privileges. Only Ubuntu 8.10 and 9.04 were
affected. (CVE-2009-1072)

Dan Carpenter discovered that SELinux did not correctly handle
certain network checks when running with compat_net=1. A local
attacker could exploit this to bypass network checks. Default Ubuntu
installations do not enable SELinux, and only Ubuntu 8.10 and 9.04 were
affected. (CVE-2009-1184)

Shaohua Li discovered that memory was not correctly initialized in the
AGP subsystem. A local attacker could potentially read kernel memory,
leading to a loss of privacy. (CVE-2009-1192)

Benjamin Gilbert discovered that the VMX implementation of KVM did
not correctly handle certain registers. An attacker in a guest VM
could exploit this to cause a host system crash, leading to a denial
of service. This only affected 32bit hosts. Ubuntu 6.06 was not
affected. (CVE-2009-1242)

Thomas Pollet discovered that the Amateur Radio X.25 Packet Layer Protocol
did not correctly validate certain fields. A remote attacker could exploit
this to read kernel memory, leading to a loss of privacy. (CVE-2009-1265)

Trond Myklebust discovered that NFS did not correctly handle certain
long filenames. An authenticated remote attacker could exploit this to
cause a system crash, leading to a denial of service. Only Ubuntu 6.06
was affected. (CVE-2009-1336)

Oleg Nesterov discovered that the kernel did not correctly handle
CAP_KILL. A local user could exploit this to send signals to arbitrary
processes, leading to a denial of service. (CVE-2009-1337)

Daniel Hokka Zakrisson discovered that signal handling was not correctly
limited to process namespaces. A local user could bypass namespace
restrictions, possibly leading to a denial of service. Only Ubuntu 8.04
was affected. (CVE-2009-1338)

Pavel Emelyanov discovered that network namespace support for IPv6 was
not correctly handled. A remote attacker could send specially crafted
IPv6 traffic that would cause a system crash, leading to a denial of
service. Only Ubuntu 8.10 and 9.04 were affected. (CVE-2009-1360)

Neil Horman discovered that the e1000 network driver did not correctly
validate certain fields. A remote attacker could send a specially
crafted packet that would cause a system crash, leading to a denial of
service. (CVE-2009-1385)

Pavan Naregundi discovered that CIFS did not correctly check lengths
when handling certain mount requests. A remote attacker could send
specially crafted traffic to cause a system crash, leading to a denial
of service. (CVE-2009-1439)

Simon Vallet and Frank Filz discovered that execute permissions were
not correctly handled by NFSv4. A local user could bypass permissions
and run restricted programs, possibly leading to an escalation of
privileges. (CVE-2009-1630)

Jeff Layton and Suresh Jayaraman discovered buffer overflows in the CIFS
client code. A malicious remote server could exploit this to cause a
system crash or execute arbitrary code as root. (CVE-2009-1633)

Mikulas Patocka discovered that /proc/iomem was not correctly
initialized on Sparc. A local attacker could use this file to crash
the system, leading to a denial of service. Ubuntu 6.06 was not
affected. (CVE-2009-1914)

Miklos Szeredi discovered that OCFS2 did not correctly handle certain
splice operations. A local attacker could exploit this to cause
a system hang, leading to a denial of service. Ubuntu 6.06 was not
affected. (CVE-2009-1961)