Public Date:
1351955: CVE-2016-2119 samba: Client side SMB2/3 required signing can be downgraded
A flaw was found in the way Samba initiated signed DCE/RPC connections. A man-in-the-middle attacker could use this flaw to downgrade the connection to not use signing and therefore impersonate the server.

Find out more about CVE-2016-2119 from the MITRE CVE dictionary dictionary and NIST NVD.

CVSS v2 metrics

Base Score 5.4
Base Metrics AV:A/AC:M/Au:N/C:P/I:P/A:P
Access Vector Adjacent Network
Access Complexity Medium
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial

CVSS v3 metrics

CVSS3 Base Score 7.5
CVSS3 Base Metrics CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Adjacent Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity Impact High
Availability Impact High

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 7 (samba) RHSA-2016:1486 2016-07-26
Red Hat Gluster 3 Samba on RHEL-6 (samba) RHSA-2016:1494 2016-07-26
Red Hat Gluster 3 Samba on RHEL-7 (samba) RHSA-2016:1494 2016-07-26
Red Hat Enterprise Linux 6 (samba4) RHSA-2016:1487 2016-07-26

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 6 samba Not affected
Red Hat Enterprise Linux 5 samba Not affected


Red Hat would like to thank the Samba project for reporting this issue. Upstream acknowledges Stefan Metzmacher as the original reporter.
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