Mac OS X Multiple Vulnerabilities (Security Update 2017-001

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

include("compat.inc");

if (description)
{
  script_id(99135);
  script_version("1.7");
  script_cvs_date("Date: 2019/06/19 15:17:43");

  script_cve_id(
    "CVE-2016-4688",
    "CVE-2016-7056",
    "CVE-2017-2432",
    "CVE-2017-2477",
    "CVE-2017-5029"
  );
  script_bugtraq_id(
    94572,
    95375,
    96767,
    97137,
    97303
  );
  script_xref(name:"APPLE-SA", value:"APPLE-SA-2017-03-27-3");

  script_name(english:"Mac OS X Multiple Vulnerabilities (Security Update 2017-001");
  script_summary(english:"Checks for the presence of Security Update 2017-001.");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is missing a Mac OS X update that fixes multiple
security vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The remote host is running a version of Mac OS X 10.10.5 or 10.11.6
that is missing a security update. It is therefore, affected by
multiple vulnerabilities :

  - An information disclosure vulnerability exists in the
    LibreSSL component due to a flaw in the ECDSA
    implementation that is triggered when not properly
    setting a flag in ECDSA signing nonces to indicate that
    only constant-time code paths should be followed. An
    unauthenticated, remote attacker can exploit this to
    conduct side-channel cache-timing attacks, allowing the
    attacker to recover the  modular inversion state
    sequences and the ECDSA private keys. Note that this
    vulnerability does not affect Mac OS X 10.10.5.
    (CVE-2016-7056)

  - An integer overflow condition exists in the ImageIO
    component due to improper validation of user-supplied
    input. An unauthenticated, remote attacker can exploit
    this, by convincing a user to open a specially crafted
    JPEG file, to cause a denial of service condition or the
    execution of arbitrary code. (CVE-2017-2432)

  - Multiple memory corruption issues exist in the libxslt
    component that allow an unauthenticated, remote attacker
    to cause a denial of service condition or the execution
    of arbitrary code. (CVE-2017-2477)

  - An integer overflow condition exists in the libxslt
    component in the xsltAddTextString() function in
    transform.c. An unauthenticated, remote attacker can
    exploit this, by convincing a user to open a specially
    crafted file, to cause an out-of-bounds write,
    potentially allowing the execution of arbitrary code.
    (CVE-2017-5029)");
  script_set_attribute(attribute:"see_also", value:"https://support.apple.com/en-us/HT207615");
  # https://lists.apple.com/archives/security-announce/2017/Mar/msg00004.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ddb4db4a");
  script_set_attribute(attribute:"solution", value:
"Install Security Update 2017-001 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/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:N/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-2017-2477");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/12/31");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/03/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/03/31");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:apple:mac_os_x");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"MacOS X Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/MacOSX/Version", "Host/MacOSX/packages/boms");

  exit(0);
}

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

# Compare 2 patch numbers to determine if patch requirements are satisfied.
# Return true if this patch or a later patch is applied
# Return false otherwise
function check_patch(year, number)
{
  local_var p_split = split(patch, sep:"-");
  local_var p_year  = int( p_split[0]);
  local_var p_num   = int( p_split[1]);

  if (year >  p_year) return TRUE;
  else if (year <  p_year) return FALSE;
  else if (number >=  p_num) return TRUE;
  else return FALSE;
}

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

os = get_kb_item("Host/MacOSX/Version");
if (!os) audit(AUDIT_OS_NOT, "Mac OS X");
if (!ereg(pattern:"Mac OS X 10\.(10\.5|11\.6)([^0-9]|$)", string:os)) audit(AUDIT_OS_NOT, "Mac OS X 10.10.5 or Mac OS X 10.11.6");

if ( "10.10.5" >< os) patch = "2017-001";
else if ( "10.11.6" >< os ) patch = "2017-001";

packages = get_kb_item_or_exit("Host/MacOSX/packages/boms", exit_code:1);
sec_boms_report = egrep(pattern:"^com\.apple\.pkg\.update\.(security\.|os\.SecUpd).*bom$", string:packages);
sec_boms = split(sec_boms_report, sep:'\n');

foreach package (sec_boms)
{
  # Grab patch year and number
  match = eregmatch(pattern:"[^0-9](20[0-9][0-9])[-.]([0-9]{3})[^0-9]", string:package);
  if (empty_or_null(match[1]) || empty_or_null(match[2]))
    continue;

  patch_found = check_patch(year:int(match[1]), number:int(match[2]));
  if (patch_found) exit(0, "The host has Security Update " + patch + " or later installed and is therefore not affected.");
}

report =  '\n  Missing security update : ' + patch;
report += '\n  Installed security BOMs : ';
if (sec_boms_report) report += str_replace(find:'\n', replace:'\n                            ', string:sec_boms_report);
else report += 'n/a';
report += '\n';

security_report_v4(port:0, severity:SECURITY_HOLE, extra:report);