USN-3242-2: Samba regression

Ubuntu Security Notice USN-3242-2

30th March, 2017

samba regression

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

  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary

USN-3242-1 introduced a regression in Samba.

Software description

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

Details

USN-3242-1 fixed a vulnerability in Samba. The upstream fix introduced a
regression when Samba is configured to disable following symbolic links.

This update fixes the problem.

Original advisory details:

Jann Horn discovered that Samba incorrectly handled symlinks. An
authenticated remote attacker could use this issue to access files on the
server outside of the exported directories.

Update instructions

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

Ubuntu 16.10:
samba 2:4.4.5+dfsg-2ubuntu5.5
Ubuntu 16.04 LTS:
samba 2:4.3.11+dfsg-0ubuntu0.16.04.6
Ubuntu 14.04 LTS:
samba 2:4.3.11+dfsg-0ubuntu0.14.04.7
Ubuntu 12.04 LTS:
samba 2:3.6.25-0ubuntu0.12.04.10

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

LP: 1675698