Scientific Linux Security Update : samba and cifs-utils on SL6.x i386/x86_64

2012-08-01T00:00:00
ID SL_20110829_SAMBA_AND_CIFS_UTILS_ON_SL6_X.NASL
Type nessus
Reporter Tenable
Modified 2014-08-16T00:00:00

Description

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.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text is (C) Scientific Linux.
#

include("compat.inc");

if (description)
{
  script_id(61122);
  script_version("$Revision: 1.2 $");
  script_cvs_date("$Date: 2014/08/16 19:47:27 $");

  script_cve_id("CVE-2011-1678", "CVE-2011-2522", "CVE-2011-2694", "CVE-2011-2724");

  script_name(english:"Scientific Linux Security Update : samba and cifs-utils on SL6.x i386/x86_64");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Scientific Linux host is missing one or more security
updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"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."
  );
  # http://listserv.fnal.gov/scripts/wa.exe?A2=ind1108&L=scientific-linux-errata&T=0&P=3436
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?fe1a06e2"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/o:fermilab:scientific_linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2011/08/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2012/08/01");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2012-2014 Tenable Network Security, Inc.");
  script_family(english:"Scientific Linux Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/RedHat/release", "Host/RedHat/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Scientific Linux " >!< release) audit(AUDIT_HOST_NOT, "running Scientific Linux");
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu >!< "x86_64" && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Scientific Linux", cpu);


flag = 0;
if (rpm_check(release:"SL6", reference:"cifs-utils-4.8.1-2.el6_1.2")) flag++;
if (rpm_check(release:"SL6", reference:"cifs-utils-debuginfo-4.8.1-2.el6_1.2")) flag++;
if (rpm_check(release:"SL6", reference:"libsmbclient-3.5.6-86.el6_1.4")) flag++;
if (rpm_check(release:"SL6", reference:"libsmbclient-devel-3.5.6-86.el6_1.4")) flag++;
if (rpm_check(release:"SL6", reference:"samba-3.5.6-86.el6_1.4")) flag++;
if (rpm_check(release:"SL6", reference:"samba-client-3.5.6-86.el6_1.4")) flag++;
if (rpm_check(release:"SL6", reference:"samba-common-3.5.6-86.el6_1.4")) flag++;
if (rpm_check(release:"SL6", reference:"samba-debuginfo-3.5.6-86.el6_1.4")) flag++;
if (rpm_check(release:"SL6", reference:"samba-doc-3.5.6-86.el6_1.4")) flag++;
if (rpm_check(release:"SL6", reference:"samba-domainjoin-gui-3.5.6-86.el6_1.4")) flag++;
if (rpm_check(release:"SL6", reference:"samba-swat-3.5.6-86.el6_1.4")) flag++;
if (rpm_check(release:"SL6", reference:"samba-winbind-3.5.6-86.el6_1.4")) flag++;
if (rpm_check(release:"SL6", reference:"samba-winbind-clients-3.5.6-86.el6_1.4")) flag++;
if (rpm_check(release:"SL6", reference:"samba-winbind-devel-3.5.6-86.el6_1.4")) flag++;
if (rpm_check(release:"SL6", reference:"samba-winbind-krb5-locator-3.5.6-86.el6_1.4")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");