USN-3348-1: Samba vulnerability

Ubuntu Security Notice USN-3348-1

5th 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

Summary

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

Details

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 version:

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: https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2017-9461