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Ubuntu Security Notice USN-1226-2
October 04, 2011

cifs-utils vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 11.04
- Ubuntu 10.10

Summary:

An attacker could trick cifs-utils into corrupting the system mtab file.

Software Description:
- cifs-utils: Common Internet File System utilities

Details:

Dan Rosenberg discovered that cifs-utils incorrectly handled changes to the
mtab file. A local attacker could use this issue to corrupt the mtab file,
possibly leading to a denial of service. (CVE-2011-1678)

Jan Lieskovsky discovered that cifs-utils incorrectly filtered certain
strings being added to the mtab file. A local attacker could use this issue
to corrupt the mtab file, possibly leading to a denial of service.
(CVE-2011-2724)

Update instructions:

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

Ubuntu 11.04:
  smbfs                           2:4.5-2ubuntu0.11.04.1

Ubuntu 10.10:
  smbfs                           2:4.5-2ubuntu0.10.10.1

In general, a standard system update will make all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-1226-2
  http://www.ubuntu.com/usn/usn-1226-1
  CVE-2011-1678, CVE-2011-2724

Package Information:
  https://launchpad.net/ubuntu/+source/cifs-utils/2:4.5-2ubuntu0.11.04.1
  https://launchpad.net/ubuntu/+source/cifs-utils/2:4.5-2ubuntu0.10.10.1