Samba Remote Code Execution Vulnerability (SambaCry)

# SPDX-FileCopyrightText: 2017 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-or-later

CPE = "cpe:/a:samba:samba";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.811055");
  script_version("2023-05-18T09:08:59+0000");
  script_xref(name:"CISA", value:"Known Exploited Vulnerability (KEV) catalog");
  script_xref(name:"URL", value:"https://www.cisa.gov/known-exploited-vulnerabilities-catalog");
  script_cve_id("CVE-2017-7494");
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_tag(name:"last_modification", value:"2023-05-18 09:08:59 +0000 (Thu, 18 May 2023)");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2022-08-16 13:02:00 +0000 (Tue, 16 Aug 2022)");
  script_tag(name:"creation_date", value:"2017-05-25 10:55:47 +0530 (Thu, 25 May 2017)");
  script_name("Samba Remote Code Execution Vulnerability (SambaCry)");

  script_tag(name:"summary", value:"Samba is prone to a remote code execution (RCE) vulnerability.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"insight", value:"The flaw exists due to an input validation error,
  which allows a malicious client to upload a shared library to a writable share.");

  script_tag(name:"impact", value:"Successfully exploiting this issue will allow
  remote attackers to execute arbitrary code as root on an affected system.");

  script_tag(name:"affected", value:"All Samba Server versions 3.5.0 onwards,

  Samba Server versions 4.4.x before 4.4.14,

  Samba Server versions 4.5.x before 4.5.10, and

  Samba Server versions 4.6.x before 4.6.4");

  script_tag(name:"solution", value:"Upgrade to Samba 4.6.4 or 4.5.10 or 4.4.14 or later.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"remote_banner_unreliable");
  script_xref(name:"URL", value:"https://www.samba.org/samba/security/CVE-2017-7494.html");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/98636");

  script_xref(name:"URL", value:"http://hackaday.com/2017/05/25/linux-sambacry/");
  script_xref(name:"URL", value:"http://thehackernews.com/2017/05/samba-rce-exploit.html");
  script_xref(name:"URL", value:"https://github.com/omri9741/cve-2017-7494");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_family("General");
  script_dependencies("smb_nativelanman.nasl", "gb_samba_detect.nasl");
  script_mandatory_keys("samba/smb_or_ssh/detected");
  exit(0);
}

include("version_func.inc");
include("host_details.inc");

if( isnull( port = get_app_port( cpe:CPE ) ) ) exit( 0 );
if( ! infos = get_app_version_and_location( cpe:CPE, port:port, exit_no_version:TRUE ) ) exit( 0 );
vers = infos['version'];
loc = infos['location'];

if(version_in_range(version:vers, test_version:"3.5.0", test_version2:"4.4.13")){
  fix = "4.4.14";
}

else if(vers =~ "^4\."){
  if(version_in_range(version:vers, test_version:"4.5.0", test_version2:"4.5.9")){
    fix = "4.5.10";
  }
  else if(version_in_range(version:vers, test_version:"4.6.0", test_version2:"4.6.3")){
    fix = "4.6.4";
  }
}

if(fix){
  report = report_fixed_ver( installed_version:vers, fixed_version:fix + " or apply patch", install_path:loc );
  security_message( data:report, port:port);
  exit(0);
}

exit(99);