PHP 5.5.x < 5.5.27 Multiple Vulnerabilities (BACKRONYM)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(84672);
  script_version("1.23");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/05/26");

  script_cve_id(
    "CVE-2015-3152",
    "CVE-2015-5589",
    "CVE-2015-5590",
    "CVE-2015-8838"
  );
  script_bugtraq_id(
    74398,
    75970,
    75974,
    88763
  );

  script_name(english:"PHP 5.5.x < 5.5.27 Multiple Vulnerabilities (BACKRONYM)");

  script_set_attribute(attribute:"synopsis", value:
"The remote web server uses a version of PHP that is affected by
multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its banner, the version of PHP 5.5.x running on the
remote web server is prior to 5.5.27. It is, therefore, affected by
multiple vulnerabilities :

  - A security feature bypass vulnerability, known as
    'BACKRONYM', exists due to a failure to properly enforce
    the requirement of an SSL/TLS connection when the --ssl
    client option is used. A man-in-the-middle attacker can
    exploit this flaw to coerce the client to downgrade to
    an unencrypted connection, allowing the attacker to
    disclose data from the database or manipulate database
    queries. (CVE-2015-3152)

  - A flaw in the phar_convert_to_other function in
    ext/phar/phar_object.c could allow a remote attacker
    to cause a denial of service. (CVE-2015-5589)

  - A Stack-based buffer overflow in the phar_fix_filepath
    function in ext/phar/phar.c could allow a remote attacker
    to cause a denial of service. (CVE-2015-5590)

  - A flaw exists in the PHP Connector/C component due to a
    failure to properly enforce the requirement of an
    SSL/TLS connection when the --ssl client option is used.
    A man-in-the-middle attacker can exploit this to
    downgrade the connection to plain HTTP when HTTPS is
    expected. (CVE-2015-8838)

  - An unspecified flaw exists in the
    phar_convert_to_other() function in phar_object.c during
    the conversion of invalid TAR files. An attacker can
    exploit this flaw to crash a PHP application, resulting
    in a denial of service condition.

  - The '!' character is not treated as a special character
    when delayed variable substitution is enabled. The
    functions escapeshellcmd() and escapeshellarg() are
    unable to properly sanitize arguments containing '!'.
    An attacker can exploit this to execute arbitrary
    commands.

  - A double-free flaw exists in zend_vm_execute.h due to
    improper handling of certain code. An attacker can
    exploit this flaw to crash a PHP application, resulting
    in a denial of service condition.

  - A flaw exists in the parse_ini_file() and
    parse_ini_string() functions due to improper handling of
    strings that contain a line feed followed by an escape
    character. An attacker can exploit this to crash a PHP
    application, resulting in a denial of service condition.

Note that Nessus has not tested for these issues but has instead
relied only on the application's self-reported version number.");
  script_set_attribute(attribute:"see_also", value:"http://php.net/ChangeLog-5.php#5.5.27");
  script_set_attribute(attribute:"see_also", value:"http://backronym.fail/");
  script_set_attribute(attribute:"solution", value:
"Upgrade to PHP version 5.5.27 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  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-2015-5589");

  script_set_attribute(attribute:"exploitability_ease", value:"No exploit is required");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"in_the_news", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2013/12/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/07/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/07/10");

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

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2015-2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("php_version.nasl");
  script_require_keys("www/PHP");
  script_require_ports("Services/www", 80);

  exit(0);
}

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

port = get_http_port(default:80, php:TRUE);

php = get_php_from_kb(
  port : port,
  exit_on_fail : TRUE
);

version = php["ver"];
source = php["src"];

backported = get_kb_item('www/php/'+port+'/'+version+'/backported');

if (report_paranoia < 2 && backported) audit(AUDIT_BACKPORT_SERVICE, port, "PHP "+version+" install");

# Check that it is the correct version of PHP
if (version =~ "^5(\.5)?$") audit(AUDIT_VER_NOT_GRANULAR, "PHP", port, version);
if (version !~ "^5\.5\.") audit(AUDIT_NOT_DETECT, "PHP version 5.5.x", port);

if (version =~ "^5\.5\.([0-9]|1[0-9]|2[0-6])($|[^0-9])")
{
  if (report_verbosity > 0)
  {
    report =
      '\n  Version source    : ' + source +
      '\n  Installed version : ' + version +
      '\n  Fixed version     : 5.5.27' +
      '\n';
    security_hole(port:port, extra:report);
  }
  else security_hole(port);
  exit(0);
}
else audit(AUDIT_LISTEN_NOT_VULN, "PHP", port, version);