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Category:   Application (File Transfer/Sharing)  >   Red Hat Gluster Storage Vendors:   Red Hat
(Red Hat Issues Fix for Red Hat Storage) Samba VFS Alternate Data Stream File Access Control Flaw Lets Remote Users Bypass Access Controls
SecurityTracker Alert ID:  1029553
SecurityTracker URL:
CVE Reference:   CVE-2013-4475   (Links to External Site)
Date:  Jan 6 2014
Impact:   Disclosure of user information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.1
Description:   A vulnerability was reported in Samba. A remote user can bypass access controls. Red Hat Storage is affected.

On systems with vfs_streams_depot or vfs_streams_xattr enabled, the underlying file or directory ACL is not enforced when opening an alternate data stream. A remote user can exploit this to bypass access controls.

Hemanth Thummala reported this vulnerability.

Impact:   A remote user can bypass access controls.
Solution:   Red Hat has issued a fix for Red Hat Storage.

The Red Hat advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)

Message History:   This archive entry is a follow-up to the message listed below.
Nov 13 2013 Samba VFS Alternate Data Stream File Access Control Flaw Lets Remote Users Bypass Access Controls

 Source Message Contents

Subject:  [RHSA-2014:0009-01] Important: samba security update

Hash: SHA1

                   Red Hat Security Advisory

Synopsis:          Important: samba security update
Advisory ID:       RHSA-2014:0009-01
Product:           Red Hat Storage
Advisory URL:
Issue date:        2014-01-06
CVE Names:         CVE-2013-4408 CVE-2013-4475 

1. Summary:

Updated samba packages that fix two security issues are now available for
Red Hat Storage.

The Red Hat Security Response Team has rated this update as having
important security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

2. Relevant releases/architectures:

Red Hat Storage Server 2.1 - x86_64

3. Description:

Samba is an open-source implementation of the Server Message Block (SMB) or
Common Internet File System (CIFS) protocol, which allows PC-compatible
machines to share files, printers, and other information.

A heap-based buffer overflow flaw was found in the DCE-RPC client code in
Samba. A specially crafted DCE-RPC packet could cause various Samba
programs to crash or, possibly, execute arbitrary code when parsed.
A malicious or compromised Active Directory Domain Controller could use
this flaw to compromise the winbindd daemon running with root privileges.

A flaw was found in the way Samba performed ACL checks on alternate file
and directory data streams. An attacker able to access a CIFS share with
alternate stream support enabled could access alternate data streams
regardless of the underlying file or directory ACL permissions.

Red Hat would like to thank the Samba project for reporting CVE-2013-4408.
Upstream acknowledges Stefan Metzmacher and Michael Adam of SerNet as the
original reporters of this issue.

All users of Red Hat Storage are advised to upgrade to these updated
packages, which contain backported patches to correct these issues. After
installing this update, the smb service will be restarted automatically.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at

5. Bugs fixed (

1018032 - CVE-2013-4408 samba: Heap-based buffer overflow due to incorrect DCE-RPC fragment length field check
1024542 - CVE-2013-4475 samba: no access check verification on stream files

6. Package List:

Red Hat Storage Server 2.1:



These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from

7. References:

8. Contact:

The Red Hat security contact is <>.  More contact
details at

Copyright 2014 Red Hat, Inc.
Version: GnuPG v1.4.4 (GNU/Linux)


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