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Category:   Application (File Transfer/Sharing)  >   Samba Vendors:   Samba.org
Samba Symlink Race Condition Lets Remote Authenticated Users View Non-Exported Files on the Target System
SecurityTracker Alert ID:  1038117
SecurityTracker URL:  http://securitytracker.com/id/1038117
CVE Reference:   CVE-2017-2619   (Links to External Site)
Date:  Mar 23 2017
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to versions 4.4.12, 4.5.7, 4.6.1
Description:   A vulnerability was reported in Samba. A remote authenticated user can obtain files on the target system.

A remote authenticated user with write access to the exported portions of the file system on the target server via SMB1 unix extensions or NFS can rename a file on the target share and then create a symbolic link (symlink) to an arbitrary location on the target file system to potentially access the target file.

[Editor's note: The vendor indicates that the race condition is difficult to win but is theoretically possible.]

Jann Horn of Google reported this vulnerability.

Impact:   A remote authenticated user with write privileges on the target share can obtain files from non-exported directories on the target system.
Solution:   The vendor has issued a fix (4.4.12, 4.5.7, 4.6.1).

The vendor advisory is available at:

https://www.samba.org/samba/security/CVE-2017-2619.html

Vendor URL:  www.samba.org/samba/security/CVE-2017-2619.html (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Mar 23 2017 (Ubuntu Issues Fix) Samba Symlink Race Condition Lets Remote Authenticated Users View Non-Exported Files on the Target System
Ubuntu has issued a fix for Ubuntu Linux 12.04 LTS, 14.04 LTS, 16.04 LTS, and 16.10.
Apr 25 2017 (Ubuntu Issues Fix) Samba Symlink Race Condition Lets Remote Authenticated Users View Non-Exported Files on the Target System
Ubuntu has issued a fix for Ubuntu Linux 17.04.
May 22 2017 (Red Hat Issues Fix) Samba Symlink Race Condition Lets Remote Authenticated Users View Non-Exported Files on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Jun 9 2017 (HPE Issues Fix for HPE NonStop Server) Samba Symlink Race Condition Lets Remote Authenticated Users View Non-Exported Files on the Target System
HPE has issued a fix for HPE NonStop Server.
Aug 1 2017 (Red Hat Issues Fix for Red Hat Gluster Storage) Samba Symlink Race Condition Lets Remote Authenticated Users View Non-Exported Files on the Target System
Red Hat has issued a fix for Red Hat Gluster Storage for Red Hat Enterprise Linux 7.
Sep 21 2017 (Red Hat Issues Fix for Red Hat Gluster Storage) Samba Symlink Race Condition Lets Remote Authenticated Users View Non-Exported Files on the Target System
Red Hat has issued a fix for Red Hat Gluster Storage.
Sep 21 2017 (Red Hat Issues Fix) Samba Symlink Race Condition Lets Remote Authenticated Users View Non-Exported Files on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 6.
Sep 22 2017 (CentOS Issues Fix) Samba Symlink Race Condition Lets Remote Authenticated Users View Non-Exported Files on the Target System
CentOS has issued a fix for CentOS 6.
Sep 28 2017 (Oracle Issues Fix for Oracle Linux) Samba Symlink Race Condition Lets Remote Authenticated Users View Non-Exported Files on the Target System
Oracle has issued a fix for Oracle Linux 6.



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