RHSA-2017:0494 - Security Advisory

Topic

An update for samba is now available for Red Hat Gluster Storage 3.2 for RHEL 6.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Samba is an open-source implementation of the Server Message Block (SMB) protocol and the related Common Internet File System (CIFS) protocol, which allow PC-compatible machines to share files, printers, and various information.

The following packages have been upgraded to a later upstream version: samba (4.4.6). (BZ#1382291)

Security Fix(es):

• It was found that Samba always requested forwardable tickets when using Kerberos authentication. A service to which Samba authenticated using Kerberos could subsequently use the ticket to impersonate Samba to other services or domain users. (CVE-2016-2125)
• A flaw was found in the way Samba handled PAC (Privilege Attribute Certificate) checksums. A remote, authenticated attacker could use this flaw to crash the winbindd process. (CVE-2016-2126)

Enhancement(s):

• The gluster vfs plugin now supports more than one volfile server. Samba tries to connect to the next server on the list if one of the gluster servers is not reachable. (BZ#1330081)
• This update provides stability and improvements in error handling and code maintainability in the shadow copy module. (BZ#1385663)

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing this update, the smb service will be restarted automatically.

Affected Products

• Red Hat Gluster Storage Server for On-premise 3 for RHEL 6 x86_64

Fixes

• BZ - 1292781 - (RHEL6) CTDB: SELinux: ctdb disablescript fails to execute because of SELinux avc's
• BZ - 1330081 - [RHEL6] [RFE] gluster vfs plugin should be able to make use of multiple volfile server feature of gfapi
• BZ - 1379592 - [RHEL6] Bring content into empty distgit branch
• BZ - 1382291 - [RHEL6] Rebase Samba to 4.4.6 for RHGS 3.2.0
• BZ - 1385663 - [RHEL6] Back port changes in shadow copy module for VSS support from upstream
• BZ - 1403114 - CVE-2016-2125 samba: Unconditional privilege delegation to Kerberos servers in trusted realms
• BZ - 1403115 - CVE-2016-2126 samba: Flaws in Kerberos PAC validation can trigger privilege elevation
• BZ - 1406287 - [RHEL6] [SAMBA-CTDB]IP failover with ctdb leads to smbd crash

CVEs

• CVE-2016-2125
• CVE-2016-2126

References

• https://access.redhat.com/security/updates/classification/#moderate