RHSA-2014:0009 - Security Advisory

Topic

Updated samba packages that fix two security issues are now available for
Red Hat Storage.

The Red Hat Security Response Team has rated this update as having
important security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

Description

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

A heap-based buffer overflow flaw was found in the DCE-RPC client code in
Samba. A specially crafted DCE-RPC packet could cause various Samba
programs to crash or, possibly, execute arbitrary code when parsed.
A malicious or compromised Active Directory Domain Controller could use
this flaw to compromise the winbindd daemon running with root privileges.
(CVE-2013-4408)

A flaw was found in the way Samba performed ACL checks on alternate file
and directory data streams. An attacker able to access a CIFS share with
alternate stream support enabled could access alternate data streams
regardless of the underlying file or directory ACL permissions.
(CVE-2013-4475)

Red Hat would like to thank the Samba project for reporting CVE-2013-4408.
Upstream acknowledges Stefan Metzmacher and Michael Adam of SerNet as the
original reporters of this issue.

All users of Red Hat Storage are advised to upgrade to these updated
packages, which contain backported patches to correct these issues. After
installing this update, the smb service will be restarted automatically.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/site/articles/11258

Affected Products

• Red Hat Gluster Storage Server for On-premise 2.1 x86_64
• Red Hat Storage for Public Cloud (via RHUI) 2.1 x86_64

Fixes

• BZ - 1018032 - CVE-2013-4408 samba: Heap-based buffer overflow due to incorrect DCE-RPC fragment length field check
• BZ - 1024542 - CVE-2013-4475 samba: no access check verification on stream files

CVEs

• CVE-2013-4408
• CVE-2013-4475

References

• https://access.redhat.com/security/updates/classification/#important
• http://www.samba.org/samba/security/CVE-2013-4408
• http://www.samba.org/samba/security/CVE-2013-4475