USN-1226-1: Samba vulnerabilities

Ubuntu Security Notice USN-1226-1

4th October, 2011

samba vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 10.04 LTS
  • Ubuntu 8.04 LTS

Summary

An attacker could trick Samba into corrupting the system mtab file.

Software description

  • samba - SMB/CIFS file, print, and login server for Unix

Details

Dan Rosenberg discovered that Samba 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 Samba 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. This issue
only affected Ubuntu 10.04 LTS. (CVE-2011-2724)

Dan Rosenberg discovered that Samba incorrectly handled the mtab lock file.
A local attacker could use this issue to create a stale lock file, possibly
leading to a denial of service. (CVE-2011-3585)

Update instructions

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

Ubuntu 10.04 LTS:
smbfs 2:3.4.7~dfsg-1ubuntu3.8
Ubuntu 8.04 LTS:
smbfs 3.0.28a-1ubuntu4.16

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2011-1678, CVE-2011-2724, CVE-2011-3585