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Category:   Application (File Transfer/Sharing)  >   Samba Vendors:   Samba.org
(Ubuntu Issues Fix) Samba Symlink Race Condition Lets Remote Authenticated Users View Non-Exported Files on the Target System
SecurityTracker Alert ID:  1038119
SecurityTracker URL:  http://securitytracker.com/id/1038119
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:   Ubuntu has issued a fix.

The Ubuntu advisory is available at:

http://www.ubuntu.com/usn/usn-3242-1

Vendor URL:  www.ubuntu.com/usn/usn-3242-1 (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  12.04 LTS, 14.04 LTS, 16.04 LTS, 16.10

Message History:   This archive entry is a follow-up to the message listed below.
Mar 23 2017 Samba Symlink Race Condition Lets Remote Authenticated Users View Non-Exported Files on the Target System



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