USN-3426-1: Samba vulnerabilities

Ubuntu Security Notice USN-3426-1

21st September, 2017

samba vulnerabilities

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

  • Ubuntu 17.04
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

Samba could be made to expose sensitive information over the network.

Software description

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

Details

Stefan Metzmacher discovered that Samba incorrectly enforced SMB signing in
certain situations. A remote attacker could use this issue to perform a man
in the middle attack. (CVE-2017-12150)

Stefan Metzmacher discovered that Samba incorrectly handled encryption
across DFS redirects. A remote attacker could use this issue to perform a
man in the middle attack. (CVE-2017-12151)

Yihan Lian and Zhibin Hu discovered that Samba incorrectly handled memory
when SMB1 is being used. A remote attacker could possibly use this issue to
obtain server memory contents. (CVE-2017-12163)

Update instructions

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

Ubuntu 17.04:
samba 2:4.5.8+dfsg-0ubuntu0.17.04.7
Ubuntu 16.04 LTS:
samba 2:4.3.11+dfsg-0ubuntu0.16.04.11
Ubuntu 14.04 LTS:
samba 2:4.3.11+dfsg-0ubuntu0.14.04.12

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-2017-12150, CVE-2017-12151, CVE-2017-12163