Synopsis:    Moderate: samba and cifs-utils security and bug fix update
Issue Date:  2011-08-29
CVE Numbers: CVE-2011-1678
              CVE-2011-2522
              CVE-2011-2694
              CVE-2011-2724


Samba is a suite of programs used by machines to share files, printers, 
and other information. The cifs-utils package contains utilities for 
mounting and managing CIFS (Common Internet File System) shares.

A cross-site scripting (XSS) flaw was found in the password change page 
of the Samba Web Administration Tool (SWAT). If a remote attacker could 
trick a user, who was logged into the SWAT interface, into visiting a
specially-crafted URL, it would lead to arbitrary web script execution 
in the context of the user's SWAT session. (CVE-2011-2694)

It was found that SWAT web pages did not protect against Cross-Site 
Request Forgery (CSRF) attacks. If a remote attacker could trick a user,
who was logged into the SWAT interface, into visiting a 
specially-crafted URL, the attacker could perform Samba configuration 
changes with the privileges of the logged in user. (CVE-2011-2522)

It was found that the fix for CVE-2010-0547, provided in the cifs-utils
package included in the GA release of Scientific Linux 6, was
incomplete. The mount.cifs tool did not properly handle share or 
directory names containing a newline character, allowing a local 
attacker to corrupt the mtab (mounted file systems table) file via a 
specially-crafted CIFS share mount request, if mount.cifs had the setuid 
bit set. (CVE-2011-2724)

It was found that the mount.cifs tool did not handle certain errors
correctly when updating the mtab file. If mount.cifs had the setuid bit
set, a local attacker could corrupt the mtab file by setting a small 
file size limit before running mount.cifs. (CVE-2011-1678)

Note: mount.cifs from the cifs-utils package distributed by Scientific 
Linux does not have the setuid bit set. We recommend that administrators 
do not manually set the setuid bit for mount.cifs.


This update also fixes the following bug:

* If plain text passwords were used ("encrypt passwords = no" in
"/etc/samba/smb.conf"), Samba clients running the Windows XP or Windows
Server 2003 operating system may not have been able to access Samba 
shares after installing the Microsoft Security Bulletin MS11-043. This 
update corrects this issue, allowing such clients to use plain text 
passwords to access Samba shares.

Users of samba and cifs-utils are advised to upgrade to these updated
packages, which contain backported patches to resolve these issues. 
After installing this update, the smb service will be restarted 
automatically.

SL6:
   i386
      cifs-utils-4.8.1-2.el6_1.2.i686.rpm
      samba-winbind-krb5-locator-3.5.6-86.el6_1.4.i686.rpm
      samba-winbind-devel-3.5.6-86.el6_1.4.i686.rpm
      samba-winbind-clients-3.5.6-86.el6_1.4.i686.rpm
      samba-winbind-3.5.6-86.el6_1.4.i686.rpm
      samba-swat-3.5.6-86.el6_1.4.i686.rpm
      samba-domainjoin-gui-3.5.6-86.el6_1.4.i686.rpm
      samba-doc-3.5.6-86.el6_1.4.i686.rpm
      samba-debuginfo-3.5.6-86.el6_1.4.i686.rpm
      cifs-utils-debuginfo-4.8.1-2.el6_1.2.i686.rpm
      libsmbclient-3.5.6-86.el6_1.4.i686.rpm
      libsmbclient-devel-3.5.6-86.el6_1.4.i686.rpm
      samba-3.5.6-86.el6_1.4.i686.rpm
      samba-client-3.5.6-86.el6_1.4.i686.rpm
      samba-common-3.5.6-86.el6_1.4.i686.rpm
   x86_64
      samba-debuginfo-3.5.6-86.el6_1.4.x86_64.rpm
      samba-doc-3.5.6-86.el6_1.4.x86_64.rpm
      samba-domainjoin-gui-3.5.6-86.el6_1.4.x86_64.rpm
      samba-swat-3.5.6-86.el6_1.4.x86_64.rpm
      samba-winbind-3.5.6-86.el6_1.4.x86_64.rpm
      samba-winbind-clients-3.5.6-86.el6_1.4.i686.rpm
      samba-winbind-clients-3.5.6-86.el6_1.4.x86_64.rpm
      samba-winbind-devel-3.5.6-86.el6_1.4.i686.rpm
      samba-winbind-devel-3.5.6-86.el6_1.4.x86_64.rpm
      samba-debuginfo-3.5.6-86.el6_1.4.i686.rpm
      samba-common-3.5.6-86.el6_1.4.x86_64.rpm
      cifs-utils-4.8.1-2.el6_1.2.x86_64.rpm
      cifs-utils-debuginfo-4.8.1-2.el6_1.2.x86_64.rpm
      libsmbclient-3.5.6-86.el6_1.4.i686.rpm
      libsmbclient-3.5.6-86.el6_1.4.x86_64.rpm
      libsmbclient-devel-3.5.6-86.el6_1.4.i686.rpm
      libsmbclient-devel-3.5.6-86.el6_1.4.x86_64.rpm
      samba-3.5.6-86.el6_1.4.x86_64.rpm
      samba-client-3.5.6-86.el6_1.4.x86_64.rpm
      samba-common-3.5.6-86.el6_1.4.i686.rpm
      samba-winbind-krb5-locator-3.5.6-86.el6_1.4.x86_64.rpm

- Scientific Linux Development Team