Samba < 3.0.37 / 3.2.15 / 3.3.8 / 3.4.2 Multiple Vulnerabilities

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

include("compat.inc");

if (description)
{
  script_id(41970);
  script_version("1.16");
  script_cvs_date("Date: 2018/11/15 20:50:23");

  script_cve_id("CVE-2009-2813", "CVE-2009-2906", "CVE-2009-2948");
  script_bugtraq_id(36572, 36573);

  script_name(english:"Samba < 3.0.37 / 3.2.15 / 3.3.8 / 3.4.2 Multiple Vulnerabilities");
  script_summary(english:"Checks version of Samba");

  script_set_attribute(attribute:"synopsis", value:"The remote Samba server may be affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its banner, the version of Samba server on the remote
host is earlier than 3.0.37 / 3.2.15 / 3.3.8 / 3.4.2. Such versions
are potentially affected by multiple issues :

  - If a user in '/etc/passwd' is misconfigured to have an
    empty home directory, then connecting to the home share
    of this user will use the root of the file system as the
    home directory. (CVE-2009-2813)

  - Specially crafted SMB requests on authenticated
    SMB connections can send smbd into a 100% loop, causing
    a denial of service. (CVE-2009-2906)

  - When 'mount.cifs' is installed as a setuid program, a
    user can pass it a credential or password path to which
    he or she does not have access and then use the
    '--verbose' option to view the first line of that file.
    (CVE-2009-2948)");

  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2009-2906.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2009-2948.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2009-2813.html");

  script_set_attribute(attribute:"solution", value:"Upgrade to Samba 3.0.37 / 3.2.15 / 3.3.8 / 3.4.2 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:P/I:P/A:P");
  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:"2009/10/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2009/10/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2009/10/02");

  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) 2009-2018 Tenable Network Security, Inc.");

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

  exit(0);
}

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

if (report_paranoia < 2) audit(AUDIT_PARANOID);

lanman = get_kb_item("SMB/NativeLanManager");
if (isnull(lanman)) exit(1, "The 'SMB/NativeLanManager' KB item is missing.");
if ("Samba " >!< lanman) exit(0, "The host is not using Samba.");

if (
  lanman =~ "Samba 3\.0\.([0-9]|[0-2][0-9]|3[0-6])([^0-9]|$)" ||
  lanman =~ "Samba 3\.2\.([0-9]|1[0-4])([^0-9]|$)" ||
  lanman =~ "Samba 3\.3\.[0-7]([^0-9]|$)" ||
  lanman =~ "Samba 3\.4\.[01]([^0-9]|$)"
)
{
  if (report_verbosity > 0)
  {
    report = string(
      "\n",
      "The remote Samba server appears to be :\n",
      "\n",
      "  ", lanman, "\n"
    );
    security_warning(port:get_kb_item("SMB/transport"), extra:report);
  }
  else security_warning(get_kb_item("SMB/transport"));
}
exit(0, "The host is not affected because " + lanman + " is installed.");