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Ubuntu Security Notice USN-1226-1

Ubuntu Security Notice USN-1226-1
Posted Oct 4, 2011
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1226-1 - 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. 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. Various other issues were also addressed.

tags | advisory, denial of service, local
systems | linux, ubuntu
advisories | CVE-2011-1678, CVE-2011-2724, CVE-2011-3585
SHA-256 | 71e65f5653de3223a61f2d146fe9e51956f701ec43a9f64818e94a0e65975f98

Ubuntu Security Notice USN-1226-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-1226-1
October 04, 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 versions:

Ubuntu 10.04 LTS:
smbfs 2:3.4.7~dfsg-1ubuntu3.8

Ubuntu 8.04 LTS:
smbfs 3.0.28a-1ubuntu4.16

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

References:
http://www.ubuntu.com/usn/usn-1226-1
CVE-2011-1678, CVE-2011-2724, CVE-2011-3585

Package Information:
https://launchpad.net/ubuntu/+source/samba/2:3.4.7~dfsg-1ubuntu3.8
https://launchpad.net/ubuntu/+source/samba/3.0.28a-1ubuntu4.16


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