Subject: [ASA-201705-22] samba: arbitrary code execution

Arch Linux Security Advisory ASA-201705-22
==========================================

Severity: High
Date    : 2017-05-30
CVE-ID  : CVE-2017-7494
Package : samba
Type    : arbitrary code execution
Remote  : Yes
Link    : https://security.archlinux.org/AVG-279

Summary
=======

The package samba before version 4.5.10-1 is vulnerable to arbitrary
code execution.

Resolution
==========

Upgrade to 4.5.10-1.

# pacman -Syu "samba>=4.5.10-1"

The problem has been fixed upstream in version 4.5.10.

Workaround
==========

Add the parameter:

nt pipe support = no

to the [global] section of your smb.conf and restart smbd. This
prevents clients from accessing any named pipe endpoints. Note that
this can disable some expected functionality for Windows clients.

Description
===========

All versions of Samba from 3.5.0 onwards are vulnerable to a remote
code execution vulnerability, allowing a malicious client to upload a
shared library to a writable share, and then cause the server to load
and execute it.

Impact
======

A malicious authenticated client can execute arbitrary code on the
affected host by uploading a shared library to a writable share.

References
==========

https://www.samba.org/samba/security/CVE-2017-7494.html
https://security.archlinux.org/CVE-2017-7494