Samba 4.5.x < 4.5.16 / 4.6.x < 4.6.14 / 4.7.x < 4.7.6 Multiple Vulnerabilities

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

include("compat.inc");

if (description)
{
  script_id(108378);
  script_version("1.4");
  script_cvs_date("Date: 2019/11/08");

  script_cve_id("CVE-2018-1050", "CVE-2018-1057");
  script_bugtraq_id(103382, 103387);

  script_name(english:"Samba 4.5.x < 4.5.16 / 4.6.x < 4.6.14 / 4.7.x < 4.7.6 Multiple Vulnerabilities");
  script_summary(english:"Checks the version of Samba.");

  script_set_attribute(attribute:"synopsis", value:
"The remote Samba server is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Samba running on the remote host is 4.5.x prior to
4.5.16, or 4.6.x prior to 4.6.14, or 4.7.x prior to 4.7.6. It is,
therefore, affected by a remote DoS and a remote password manipulation
vulnerability.

Note: Refer to the advisories for possible workarounds.

Note that Nessus has not tested for this issue but has instead relied
only on the application's self-reported version number.");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2018-1050.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/security/CVE-2018-1057.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/history/samba-4.5.16.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/history/samba-4.6.14.html");
  script_set_attribute(attribute:"see_also", value:"https://www.samba.org/samba/history/samba-4.7.6.html");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Samba version 4.5.16 / 4.6.14 / 4.7.6 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-1057");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/03/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/03/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/03/15");

  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) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("smb_nativelanman.nasl");
  script_require_keys("SMB/NativeLanManager", "SMB/samba", "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("SMB/transport");
if (!port) port = 445;

lanman = get_kb_item_or_exit("SMB/NativeLanManager");

if ("Samba " >!< lanman) audit(AUDIT_NOT_LISTEN, "Samba", port);

version = lanman - 'Samba ';

if (version =~ "^4(\.[5-9])?$")
  audit(AUDIT_VER_NOT_GRANULAR, "Samba", port, version);

fix = NULL;

regexes = make_array(-2, "a(\d+)", -1, "rc(\d+)");

# Affected :
# Note versions prior to 4.6 are EoL
# https://wiki.samba.org/index.php/Samba_Release_Planning
#
# We are including a 4.5.x check because they did release 4.5.16
# 4.5.x < 4.5.16
# 4.6.x < 4.6.14
# 4.7.x < 4.7.6
if (version =~ "^4\.5\.")
  fix = '4.5.16';
else if (version =~ "^4\.6\.")
  fix = '4.6.14';
else if (version =~ "^4\.7\.")
  fix = '4.7.6';

if ( !isnull(fix) &&
     (ver_compare(ver:version, fix:fix, regexes:regexes) < 0) &&
     (ver_compare(ver:version, fix:'4.0.0', regexes:regexes) >= 0) )
{
  report = '\n  Installed version : ' + version +
           '\n  Fixed version     : ' + fix +
           '\n';
  security_report_v4(port:port, severity:SECURITY_WARNING, extra:report);
}
else audit(AUDIT_LISTEN_NOT_VULN, "Samba", port, version);