samba vulnerabilities

11 December 2013

samba vulnerabilities

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

• Ubuntu 13.10
• Ubuntu 13.04
• Ubuntu 12.10
• Ubuntu 12.04 LTS
• Ubuntu 10.04 LTS

Summary

Several security issues were fixed in Samba.

Software Description

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

Details

It was discovered that Winbind incorrectly handled invalid group names with the require_membership_of parameter. If an administrator used an invalid group name by mistake, access was granted instead of having the login fail. (CVE-2012-6150)

Stefan Metzmacher and Michael Adam discovered that Samba incorrectly handled DCE-RPC fragment length fields. A remote attacker could use this issue to cause Samba to crash, resulting in a denial of service, or possibly execute arbitrary code as the root user. (CVE-2013-4408)

Hemanth Thummala discovered that Samba incorrectly handled file permissions when vfs_streams_depot or vfs_streams_xattr were enabled. A remote attacker could use this issue to bypass intended restrictions. (CVE-2013-4475)

Update instructions

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

Ubuntu 13.10

libpam-winbind - 2:3.6.18-1ubuntu3.1

samba - 2:3.6.18-1ubuntu3.1

Ubuntu 13.04

libpam-winbind - 2:3.6.9-1ubuntu1.2

samba - 2:3.6.9-1ubuntu1.2

Ubuntu 12.10

libpam-winbind - 2:3.6.6-3ubuntu5.3

samba - 2:3.6.6-3ubuntu5.3

Ubuntu 12.04 LTS

libpam-winbind - 2:3.6.3-2ubuntu2.9

samba - 2:3.6.3-2ubuntu2.9

Ubuntu 10.04 LTS

samba - 2:3.4.7~dfsg-1ubuntu3.13

winbind - 2:3.4.7~dfsg-1ubuntu3.13

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-2012-6150
• CVE-2013-4408
• CVE-2013-4475