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Red Hat Enterprise Linux 5 RHSA-2012:0313-03 Low: Samba Issue

red hat
Calendar Grey February 21, 2012
Dist Redhat Esm H88
The latest Samba patch from Red Hat targets a minor security vulnerability alongside various bug corrections, improving overall efficiency in RHEL 5.
Updated samba packages that fix one security issue, one bug, and add one enhancement are now available for Red Hat Enterprise Linux 5

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/kb/docs/DOC-11259

Summary

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.
The default Samba server configuration enabled both the "wide links" and "unix extensions" options, allowing Samba clients with write access to a share to create symbolic links that point to any location on the file system. Clients connecting with CIFS UNIX extensions disabled could have such links resolved on the server, allowing them to access and possibly overwrite files outside of the share. With this update, "wide links" is set to "no" by default. In addition, the update ensures "wide links" is disabled for shares that have "unix extensions" enabled. (CVE-2010-0926)
Warning: This update may cause files and directories that are only linked to Samba shares using symbolic links to become inaccessible to Samba clients. In deployments where support for CIFS UNIX extensions is not needed (such as when files are exported to Microsoft Windows clients), administrators may prefer to set the "unix extensions" option to "no" to allow the use of symbolic links to access files out of the shared directories. All existing symbolic links in a share should be reviewed before re-enabling "wide links".
These updated samba packages also fix the following bug:
* The smbclient tool sometimes failed to return the proper exit status code. Consequently, using smbclient in a script caused some scripts to fail. With this update, an upstream patch has been applied and smbclient now returns the correct exit status. (BZ#768908)
In addition, these updated samba packages provide the following enhancement:
* With this update, support for Windows Server 2008 R2 domains has been added. (BZ#736124)
Users are advised to upgrade to these updated samba packages, which correct these issues and add this enhancement. After installing this update, the smb service will be restarted automatically.

Topics%20covered

Topics Covered

security advisory security issue bug fix Red Hat Enterprise low severity file sharing samba update

References

https://access.redhat.com/security/cve/CVE-2010-0926 https://access.redhat.com/security/updates/classification#low

Package List

Red Hat Enterprise Linux Desktop (v. 5 client):
Source:
i386: libsmbclient-3.0.33-3.37.el5.i386.rpm samba-3.0.33-3.37.el5.i386.rpm samba-client-3.0.33-3.37.el5.i386.rpm samba-common-3.0.33-3.37.el5.i386.rpm samba-debuginfo-3.0.33-3.37.el5.i386.rpm samba-swat-3.0.33-3.37.el5.i386.rpm
x86_64: libsmbclient-3.0.33-3.37.el5.i386.rpm libsmbclient-3.0.33-3.37.el5.x86_64.rpm samba-3.0.33-3.37.el5.x86_64.rpm samba-client-3.0.33-3.37.el5.x86_64.rpm samba-common-3.0.33-3.37.el5.i386.rpm samba-common-3.0.33-3.37.el5.x86_64.rpm samba-debuginfo-3.0.33-3.37.el5.i386.rpm samba-debuginfo-3.0.33-3.37.el5.x86_64.rpm samba-swat-3.0.33-3.37.el5.x86_64.rpm
RHEL Desktop Workstation (v. 5 client):
Source:
i386: libsmbclient-devel-3.0.33-3.37.el5.i386.rpm samba-debuginfo-3.0.33-3.37.el5.i386.rpm
x86_64: libsmbclient-devel-3.0.33-3.37.el5.i386.rpm libsmbclient-devel-3.0.33-3.37.el5.x86_64.rpm samba-debuginfo-3.0.33-3.37.el5.i386.rpm samba-debuginfo-3.0.33-3.37.el5.x86_64.rpm
Red Hat Enterprise Linux (v. 5 server):
Source:
i386: libsmbclient-3.0.33-3.37.el5.i386.rpm libsmbclient-devel-3.0.33-3.37.el5.i386.rpm samba-3.0.33-3.37.el5.i386.rpm samba-client-3.0.33-3.37.el5.i386.rpm samba-common-3.0.33-3.37.el5.i386.rpm samba-debuginfo-3.0.33-3.37.el5.i386.rpm samba-swat-3.0.33-3.37.el5.i386.rpm
ia64:

Read the Full Advisory


Severity
low
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2012:0313-03
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2012:0313.html
Issue date: 2012-02-21

Topic

Updated samba packages that fix one security issue, one bug, and add oneenhancement are now available for Red Hat Enterprise Linux 5.The Red Hat Security Response Team has rated this update as having lowsecurity impact. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available from the CVE link inthe References section.

Topics%20covered

Topics Covered

security advisory security issue bug fix Red Hat Enterprise low severity file sharing samba update

Relevant Releases Architectures

RHEL Desktop Workstation (v. 5 client) - i386, x86_64

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

Bugs Fixed

562568 - CVE-2010-0926 samba: insecure "wide links" default

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