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Category:Red Hat Local Security Checks
Title:RedHat Security Advisory RHSA-2011:1221
The remote host is missing updates announced in
advisory RHSA-2011:1221.

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 Red Hat Enterprise 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 Red Hat does
not have the setuid bit set. We recommend that administrators do not
manually set the setuid bit for mount.cifs.

Red Hat would like to thank the Samba project for reporting CVE-2011-2694
and CVE-2011-2522, and Dan Rosenberg for reporting CVE-2011-1678. Upstream
acknowledges Nobuhiro Tsuji of NTT DATA Security Corporation as the
original reporter of CVE-2011-2694, and Yoshihiro Ishikawa of LAC Co., Ltd.
as the original reporter of CVE-2011-2522.

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. (BZ#728517)

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.

Please note that this update is available via
Red Hat Network. To use Red Hat Network, launch the Red
Hat Update Agent with the following command: up2date

Risk factor : High

CVSS Score:

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2011-1678
XForce ISS Database: samba-smbfs-security-bypass(66702)
Common Vulnerability Exposure (CVE) ID: CVE-2011-2522
BugTraq ID: 48899
Debian Security Information: DSA-2290 (Google Search)
HPdes Security Advisory: HPSBNS02701
HPdes Security Advisory: HPSBUX02768
HPdes Security Advisory: SSRT100598
HPdes Security Advisory: SSRT100664
XForce ISS Database: samba-swat-csrf(68843)
Common Vulnerability Exposure (CVE) ID: CVE-2011-2694
BugTraq ID: 48901
XForce ISS Database: samba-user-xss(68844)
Common Vulnerability Exposure (CVE) ID: CVE-2011-2724
Common Vulnerability Exposure (CVE) ID: CVE-2010-0547
BugTraq ID: 38326
SuSE Security Announcement: SUSE-SR:2010:008 (Google Search)
SuSE Security Announcement: SUSE-SR:2010:014 (Google Search)
CopyrightCopyright (c) 2011 E-Soft Inc.

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