USN-2855-1: Samba vulnerabilities

5 January 2016

Several security issues were fixed in Samba.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Releases

Packages

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

Details

Thilo Uttendorfer discovered that the Samba LDAP server incorrectly handled
certain packets. A remote attacker could use this issue to cause the LDAP
server to stop responding, resulting in a denial of service. This issue
only affected Ubuntu 14.04 LTS, Ubuntu 15.04 and Ubuntu 15.10.
(CVE-2015-3223)

Jan Kasprzak discovered that Samba incorrectly handled certain symlinks. A
remote attacker could use this issue to access files outside the exported
share path. (CVE-2015-5252)

Stefan Metzmacher discovered that Samba did not enforce signing when
creating encrypted connections. If a remote attacker were able to perform a
machine-in-the-middle attack, this flaw could be exploited to view sensitive
information. (CVE-2015-5296)

It was discovered that Samba incorrectly performed access control when
using the VFS shadow_copy2 module. A remote attacker could use this issue
to access snapshots, contrary to intended permissions. (CVE-2015-5299)

Douglas Bagnall discovered that Samba incorrectly handled certain string
lengths. A remote attacker could use this issue to possibly access
sensitive information. (CVE-2015-5330)

It was discovered that the Samba LDAP server incorrectly handled certain
packets. A remote attacker could use this issue to cause the LDAP server to
stop responding, resulting in a denial of service. This issue only affected
Ubuntu 14.04 LTS, Ubuntu 15.04 and Ubuntu 15.10. (CVE-2015-7540)

Andrew Bartlett discovered that Samba incorrectly checked administrative
privileges during creation of machine accounts. A remote attacker could
possibly use this issue to bypass intended access restrictions in certain
environments. This issue only affected Ubuntu 14.04 LTS, Ubuntu 15.04 and
Ubuntu 15.10. (CVE-2015-8467)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 15.10
Ubuntu 15.04
Ubuntu 14.04
Ubuntu 12.04

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

References

Related notices

Join the discussion

Need help with your security needs?

Ubuntu Pro provides up to ten-year security coverage for over 23,000 open-source packages within the Ubuntu Main and Universe repositories.

Talk to an expert to find out what would work best for you

Further reading