USN-3348-1: Samba vulnerability

5 July 2017

samba vulnerability

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

  • Ubuntu 17.04
  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


Samba could be made to hang if it received specially crafted network traffic.

Software Description

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


It was discovered that Samba incorrectly handled dangling symlinks. A remote attacker could possibly use this issue to cause Samba to hang, resulting in a denial of service. This issue only applied to Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2017-9461)

In addition, this update fixes a regression introduced by USN-3267-1 that caused Samba to incorrectly handle non-wide symlinks to directories.

Update instructions

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

Ubuntu 17.04
samba - 2:4.5.8+dfsg-0ubuntu0.17.04.3
Ubuntu 16.10
samba - 2:4.4.5+dfsg-2ubuntu5.7
Ubuntu 16.04 LTS
samba - 2:4.3.11+dfsg-0ubuntu0.16.04.8
Ubuntu 14.04 LTS
samba - 2:4.3.11+dfsg-0ubuntu0.14.04.9

To update your system, please follow these instructions:

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