RHSA-2013:1543 - Security Advisory

Topic

Updated samba4 packages that fix one security issue and two bugs are now
available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having
moderate 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.

An integer overflow flaw was found in the way Samba handled an Extended
Attribute (EA) list provided by a client. A malicious client could send a
specially crafted EA list that triggered an overflow, causing the server to
loop and reprocess the list using an excessive amount of memory.
(CVE-2013-4124)

Note: This issue did not affect the default configuration of the
Samba server.

This update fixes the following bugs:

• When Samba was installed in the build root directory, the RPM target

might not have existed. Consequently, the find-debuginfo.sh script did not
create symbolic links for the libwbclient.so.debug module associated with
the target. With this update, the paths to the symbolic links are relative
so that the symbolic links are now created correctly. (BZ#882338)

• Previously, the samba4 packages were missing a dependency for the

libreplace.so module which could lead to installation failures. With this
update, the missing dependency has been added to the dependency list of the
samba4 packages and installation now proceeds as expected. (BZ#911264)

All samba4 users are advised to upgrade to these updated packages, which
contain a backported patch to correct these issues.

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 Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x

Fixes

• BZ - 911264 - libreplace.so => not found
• BZ - 984401 - CVE-2013-4124 samba: DoS via integer overflow when reading an EA list

CVEs

• CVE-2013-4124

References

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