Samba 4.9.x < 4.9.6 / 4.10.0 < 4.10.2 World-Writable Files Vulnerability (CVE-2019-3870)

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

include("compat.inc");

if (description)
{
  script_id(124087);
  script_version("1.4");
  script_cvs_date("Date: 2019/10/30 13:24:46");

  script_cve_id("CVE-2019-3870");
  script_bugtraq_id(107798);

  script_name(english:"Samba 4.9.x < 4.9.6 / 4.10.0 < 4.10.2 World-Writable Files Vulnerability (CVE-2019-3870)");
  script_summary(english:"Checks the version of Samba.");

  script_set_attribute(attribute:"synopsis", value:
"The remote Samba server is potentially affected by a world writable files vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Samba running on the remote host is 4.9.x < 4.9.6 or 
4.10.0 prior to 4.10.2. It is, therefore, potentially affected by a 
world writable files vulnerability. An
authenticated, local attacker can exploit this issue to read and 
update files in the private/ directory.

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-2019-3870.html");
  script_set_attribute(attribute:"see_also", value:"https://download.samba.org/pub/samba/rc/samba-4.10.2.WHATSNEW.txt");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Samba version 4.9.6 / 4.10.2 or later.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:N/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:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/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-2019-3870");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/04/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/04/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/04/16");

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

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

  script_copyright(english:"This script is Copyright (C) 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");
include("vcf.inc");
include("vcf_extras.inc");

if (report_paranoia < 2) audit(AUDIT_PARANOID);

app = vcf::samba::get_app_info();
vcf::check_granularity(app_info:app, sig_segments:3);

# Note: versions < 4.7 are EOL
constraints = [
  {"min_version":"4.9.0rc0", "fixed_version":"4.9.6"},
  {"min_version":"4.10.0rc0", "fixed_version":"4.10.2"}
];

vcf::check_version_and_report(app_info:app, constraints:constraints, severity:SECURITY_NOTE, strict:FALSE);