Vulnerabilities > CVE-2007-4138 - Permissions, Privileges, and Access Controls vulnerability in Samba

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(17719);
  script_version("1.6");
  script_cvs_date("Date: 2018/07/27 18:38:14");

  script_cve_id("CVE-2007-4138");
  script_bugtraq_id(25636);

  script_name(english:"Samba idmap_ad.so Winbind nss_info Extension Local Privilege Escalation");
  script_summary(english:"Checks version of Samba");

  script_set_attribute(attribute:"synopsis", value:
"The remote Samba server is affected by a local privilege escalation
vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its banner, the version of the Samba server installed on
the remote host is affected by a local privilege escalation
vulnerability. Specifically, the Winbind nss_info extension, when the
'winbind nss info' option is set to 'rfc2307' or 'sfu', grants local
users the privileges of gid 0 if the 'RFC2307' or 'Services for UNIX'
primary group attribute is not defined.");

  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2007-4138.html");
  script_set_attribute(attribute:"solution", value:"Upgrade to Samba version 3.0.26 or later.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(264);

  script_set_attribute(attribute:"vuln_publication_date", value:"2007/09/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2007/09/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/11/18");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:samba:samba");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2011-2018 Tenable Network Security, Inc.");

  script_dependencies("smb_nativelanman.nasl");
  script_require_keys("SMB/NativeLanManager", "Settings/ParanoidReport");

  exit(0);
}

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


if (report_paranoia < 2) audit(AUDIT_PARANOID);


port = get_kb_item_or_exit("SMB/transport");

lanman = get_kb_item_or_exit("SMB/NativeLanManager");
if ("Samba " >!< lanman) exit(0, "The SMB service listening on port "+port+" is not running Samba.");

version = lanman - 'Samba ';

if (ereg(pattern:"^3\.0\.25($|[^0-9a-z]|pre|rc|[a-c])[^0-9]*$", string:version, icase:TRUE))
{
  if (report_verbosity > 0)
  {
    report = '\n  Installed version  : ' + version +
             '\n  Fixed version      : 3.0.26\n';
    security_warning(port:port, extra:report);
  }
  else security_warning(port);
}
else exit(0, "The Samba "+version+" install listening on port "+port+" is not affected.");

#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2007:1016. The text 
# itself is copyright (C) Red Hat, Inc.
#

include("compat.inc");

if (description)
{
  script_id(28245);
  script_version ("1.23");
  script_cvs_date("Date: 2019/10/25 13:36:12");

  script_cve_id("CVE-2007-4138", "CVE-2007-4572", "CVE-2007-5398");
  script_bugtraq_id(26454, 26455);
  script_xref(name:"RHSA", value:"2007:1016");

  script_name(english:"RHEL 4 : samba (RHSA-2007:1016)");
  script_summary(english:"Checks the rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Red Hat host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Updated samba packages that fix several security issues are now
available for Red Hat Enterprise Linux 4.

This update has been rated as having critical security impact by the
Red Hat Security Response Team.

Samba is a suite of programs used by machines to share files,
printers, and other information.

A buffer overflow flaw was found in the way Samba creates NetBIOS
replies. If a Samba server is configured to run as a WINS server, a
remote unauthenticated user could cause the Samba server to crash or
execute arbitrary code. (CVE-2007-5398)

A heap-based buffer overflow flaw was found in the way Samba
authenticates users. A remote unauthenticated user could trigger this
flaw to cause the Samba server to crash. Careful analysis of this flaw
has determined that arbitrary code execution is not possible, and
under most circumstances will not result in a crash of the Samba
server. (CVE-2007-4572)

A flaw was found in the way Samba assigned group IDs under certain
conditions. If the 'winbind nss info' parameter in smb.conf is set to
either 'sfu' or 'rfc2307', Samba users are incorrectly assigned the
group ID of 0. (CVE-2007-4138)

Red Hat would like to thank Alin Rad Pop of Secunia Research, Rick
King, and the Samba developers for responsibly disclosing these
issues.

All Samba users are advised to upgrade to these updated packages,
which contain a backported patch to correct these issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2007-4138"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2007-4572"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2007-5398"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2007:1016"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(119, 264);

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-swat");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:4");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:4.6");

  script_set_attribute(attribute:"vuln_publication_date", value:"2007/09/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2007/11/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2007/11/16");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2007-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Red Hat Local Security Checks");

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

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("misc_func.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) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");
os_ver = os_ver[1];
if (! preg(pattern:"^4([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 4.x", "Red Hat " + os_ver);

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 ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "s390" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu);

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2007:1016";
  yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
  if (!empty_or_null(yum_report))
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : yum_report 
    );
    exit(0);
  }
  else
  {
    audit_message = "affected by Red Hat security advisory " + rhsa;
    audit(AUDIT_OS_NOT, audit_message);
  }
}
else
{
  flag = 0;
  if (rpm_check(release:"RHEL4", reference:"samba-3.0.25b-1.el4_6.2")) flag++;

  if (rpm_check(release:"RHEL4", reference:"samba-client-3.0.25b-1.el4_6.2")) flag++;

  if (rpm_check(release:"RHEL4", reference:"samba-common-3.0.25b-1.el4_6.2")) flag++;

  if (rpm_check(release:"RHEL4", reference:"samba-swat-3.0.25b-1.el4_6.2")) flag++;


  if (flag)
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get() + redhat_report_package_caveat()
    );
    exit(0);
  }
  else
  {
    tested = pkg_tests_get();
    if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
    else audit(AUDIT_PACKAGE_NOT_INSTALLED, "samba / samba-client / samba-common / samba-swat");
  }
}