Linux Distros Unpatched Vulnerability : CVE-2017-8923

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(221240);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/09/29");

  script_cve_id("CVE-2017-8923");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2017-8923");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - The zend_string_extend function in Zend/zend_string.h in PHP through 7.1.5 does not prevent changes to
    string objects that result in a negative length, which allows remote attackers to cause a denial of
    service (application crash) or possibly have unspecified other impact by leveraging a script's use of .=
    with a long string. (CVE-2017-8923)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2017-8923");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2017-8923");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-8923");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/05/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/03/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
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  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:php5");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libzip");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libzip-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libzip-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php-ffi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php-fpm");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php-gmp");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php-ldap");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php-pecl-apcu-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php-pecl-rrd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php-pecl-xdebug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php-pecl-xdebug3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php-pecl-zip");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php-pgsql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php-process");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php-recode");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php-snmp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php-soap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php-xml");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:php-xmlrpc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:apcu-panel");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libzip-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libzip-tools");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:php-bcmath");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:php-cli");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:php-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:php-dba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:php-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:php-devel");
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  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

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

  script_dependencies("set_linux_os_id.nasl", "ssh_get_info2.nasl");
  script_require_keys("Host/OS/identifier", "Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched");
  script_require_ports("Host/OS/CentOS Linux-8", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Ubuntu Linux-14.04");

  exit(0);
}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "pkgs": [
          {"reference": "libapache2-mod-php5"},
          {"reference": "libapache2-mod-php5filter"},
          {"reference": "libphp5-embed"},
          {"reference": "php-pear"},
          {"reference": "php5"},
          {"reference": "php5-cgi"},
          {"reference": "php5-cli"},
          {"reference": "php5-common"},
          {"reference": "php5-curl"},
          {"reference": "php5-dbg"},
          {"reference": "php5-dev"},
          {"reference": "php5-enchant"},
          {"reference": "php5-fpm"},
          {"reference": "php5-gd"},
          {"reference": "php5-gmp"},
          {"reference": "php5-intl"},
          {"reference": "php5-ldap"},
          {"reference": "php5-mysql"},
          {"reference": "php5-mysqlnd"},
          {"reference": "php5-odbc"},
          {"reference": "php5-pgsql"},
          {"reference": "php5-pspell"},
          {"reference": "php5-readline"},
          {"reference": "php5-recode"},
          {"reference": "php5-snmp"},
          {"reference": "php5-sqlite"},
          {"reference": "php5-sybase"},
          {"reference": "php5-tidy"},
          {"reference": "php5-xmlrpc"},
          {"reference": "php5-xsl"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "apcu-panel"},
          {"reference": "libzip"},
          {"reference": "libzip-devel"},
          {"reference": "libzip-tools"},
          {"reference": "php"},
          {"reference": "php-bcmath"},
          {"reference": "php-cli"},
          {"reference": "php-common"},
          {"reference": "php-dba"},
          {"reference": "php-dbg"},
          {"reference": "php-devel"},
          {"reference": "php-embedded"},
          {"reference": "php-enchant"},
          {"reference": "php-ffi"},
          {"reference": "php-fpm"},
          {"reference": "php-gd"},
          {"reference": "php-gmp"},
          {"reference": "php-intl"},
          {"reference": "php-json"},
          {"reference": "php-ldap"},
          {"reference": "php-mbstring"},
          {"reference": "php-mysqlnd"},
          {"reference": "php-odbc"},
          {"reference": "php-opcache"},
          {"reference": "php-pdo"},
          {"reference": "php-pear"},
          {"reference": "php-pecl-apcu"},
          {"reference": "php-pecl-apcu-devel"},
          {"reference": "php-pecl-rrd"},
          {"reference": "php-pecl-xdebug"},
          {"reference": "php-pecl-xdebug3"},
          {"reference": "php-pecl-zip"},
          {"reference": "php-pgsql"},
          {"reference": "php-process"},
          {"reference": "php-recode"},
          {"reference": "php-snmp"},
          {"reference": "php-soap"},
          {"reference": "php-xml"},
          {"reference": "php-xmlrpc"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "apcu-panel"},
          {"reference": "libzip"},
          {"reference": "libzip-devel"},
          {"reference": "libzip-tools"},
          {"reference": "php"},
          {"reference": "php-bcmath"},
          {"reference": "php-cli"},
          {"reference": "php-common"},
          {"reference": "php-dba"},
          {"reference": "php-dbg"},
          {"reference": "php-devel"},
          {"reference": "php-embedded"},
          {"reference": "php-enchant"},
          {"reference": "php-ffi"},
          {"reference": "php-fpm"},
          {"reference": "php-gd"},
          {"reference": "php-gmp"},
          {"reference": "php-intl"},
          {"reference": "php-json"},
          {"reference": "php-ldap"},
          {"reference": "php-mbstring"},
          {"reference": "php-mysqlnd"},
          {"reference": "php-odbc"},
          {"reference": "php-opcache"},
          {"reference": "php-pdo"},
          {"reference": "php-pear"},
          {"reference": "php-pecl-apcu"},
          {"reference": "php-pecl-apcu-devel"},
          {"reference": "php-pecl-rrd"},
          {"reference": "php-pecl-xdebug"},
          {"reference": "php-pecl-xdebug3"},
          {"reference": "php-pecl-zip"},
          {"reference": "php-pgsql"},
          {"reference": "php-process"},
          {"reference": "php-recode"},
          {"reference": "php-snmp"},
          {"reference": "php-soap"},
          {"reference": "php-xml"},
          {"reference": "php-xmlrpc"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');
var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}