Debian Security Advisory
DSA-3548-1 samba -- security update
- Date Reported:
- 13 Apr 2016
- Affected Packages:
- Security database references:
- In Mitre's CVE dictionary: CVE-2015-5370, CVE-2016-2110, CVE-2016-2111, CVE-2016-2112, CVE-2016-2113, CVE-2016-2114, CVE-2016-2115, CVE-2016-2118.
- More information:
Several vulnerabilities have been discovered in Samba, a SMB/CIFS file, print, and login server for Unix. The Common Vulnerabilities and Exposures project identifies the following issues:
Jouni Knuutinen from Synopsys discovered flaws in the Samba DCE-RPC code which can lead to denial of service (crashes and high cpu consumption) and man-in-the-middle attacks.
Stefan Metzmacher of SerNet and the Samba Team discovered that the feature negotiation of NTLMSSP does not protect against downgrade attacks.
When Samba is configured as domain controller, it allows remote attackers to spoof the computer name of a secure channel's endpoint, and obtain sensitive session information. This flaw corresponds to the same vulnerability as CVE-2015-0005 for Windows, discovered by Alberto Solino from Core Security.
Stefan Metzmacher of SerNet and the Samba Team discovered that a man-in-the-middle attacker can downgrade LDAP connections to avoid integrity protection.
Stefan Metzmacher of SerNet and the Samba Team discovered that man-in-the-middle attacks are possible for client triggered LDAP connections and ncacn_http connections.
Stefan Metzmacher of SerNet and the Samba Team discovered that Samba does not enforce required smb signing even if explicitly configured.
Stefan Metzmacher of SerNet and the Samba Team discovered that SMB connections for IPC traffic are not integrity-protected.
Stefan Metzmacher of SerNet and the Samba Team discovered that a man-in-the-middle attacker can intercept any DCERPC traffic between a client and a server in order to impersonate the client and obtain the same privileges as the authenticated user account.
For the stable distribution (jessie), these problems have been fixed in version 2:4.2.10+dfsg-0+deb8u1. The issues were addressed by upgrading to the new upstream version 4.2.10, which includes additional changes and bugfixes. The depending libraries ldb, talloc, tdb and tevent required as well an update to new upstream versions for this update.
For the unstable distribution (sid), these problems have been fixed in version 2:4.3.7+dfsg-1.
Please refer to
for further details (in particular for new options and defaults).
We'd like to thank Andreas Schneider and Guenther Deschner (Red Hat), Stefan Metzmacher and Ralph Boehme (SerNet) and Aurelien Aptel (SUSE) for the massive backporting work required to support Samba 3.6 and Samba 4.2 and Andrew Bartlett (Catalyst), Jelmer Vernooij and Mathieu Parent for their help in preparing updates of Samba and the underlying infrastructure libraries.
We recommend that you upgrade your samba packages.