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Ubuntu Security Notice USN-3242-2

Ubuntu Security Notice USN-3242-2
Posted Mar 31, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3242-2 - 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. 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. Various other issues were also addressed.

tags | advisory, remote
systems | linux, ubuntu
SHA-256 | 19c8c437d5ff2c736e55fe5001b1da5f1ac26b6e6652db0528f69a57cf7faa71

Ubuntu Security Notice USN-3242-2

Change Mirror Download

===========================================================================
Ubuntu Security Notice USN-3242-2
March 30, 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 versions:

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

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

References:
http://www.ubuntu.com/usn/usn-3242-2
http://www.ubuntu.com/usn/usn-3242-1
https://launchpad.net/bugs/1675698

Package Information:
https://launchpad.net/ubuntu/+source/samba/2:4.4.5+dfsg-2ubuntu5.5
https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.6
https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.14.04.7
https://launchpad.net/ubuntu/+source/samba/2:3.6.25-0ubuntu0.12.04.10



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