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Category:   Application (Database)  >   IBM DB2 Vendors:   IBM
(IBM Issues Fix for IBM DB2) Samba Lets Remote Users Downgrade SMB Signing Security Protections on the Target System
SecurityTracker Alert ID:  1037477
SecurityTracker URL:  http://securitytracker.com/id/1037477
CVE Reference:   CVE-2016-2119   (Links to External Site)
Date:  Dec 15 2016
Impact:   Disclosure of system information, Disclosure of user information, Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 10.5, 11.1
Description:   A vulnerability was reported in Samba. A remote user can downgrade client signing security controls on the target system. IBM DB2 is affected.

A remote user that can conduct a man-in-the-middle attack can inject the SMB2_SESSION_FLAG_IS_GUEST or SMB2_SESSION_FLAG_IS_NULL flags to downgrade the client's configuration-required signing protections for SMB2 or SMB3 client connections and impersonate the target server.

Clients that are configured to use SMB signing are affected.

Management tools (e.g., net, samba-tool, rpcclient) that use DCERPC over SMB2/3 connections are also affected.

Stefan Metzmacher of SerNet (https://samba.plus) and the Samba Team (https://www.samba.org) reported this vulnerability.

Impact:   A remote user that can conduct a man-in-the-middle attack can downgrade client signing security controls on the target system.
Solution:   IBM has issued a fix for IBM DB2 (11.1.1 FP1).

The IBM advisory is available at:

http://www-01.ibm.com/support/docview.wss?uid=swg21994093

Vendor URL:  www-01.ibm.com/support/docview.wss?uid=swg21994093 (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any), UNIX (AIX), UNIX (HP/UX), UNIX (Solaris - SunOS)

Message History:   This archive entry is a follow-up to the message listed below.
Jul 7 2016 Samba Lets Remote Users Downgrade SMB Signing Security Protections on the Target System



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