Palo Alto Networks PAN-OS 7.1.1 Out-of-Sequence Packet Firewall Bypass

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

include("compat.inc");

if (description)
{
  script_id(91675);
  script_version("1.4");
  script_cvs_date("Date: 2018/08/08 12:52:14");


  script_name(english:"Palo Alto Networks PAN-OS 7.1.1 Out-of-Sequence Packet Firewall Bypass");
  script_summary(english:"Checks the PAN-OS version.");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by a firewall bypass vulnerability.");
  script_set_attribute(attribute:"description",value:
"The version of Palo Alto Networks PAN-OS running on the remote host is
7.1.1. It is, therefore, affected by an unspecified flaw when handling
out-of-sequence packets. An unauthenticated, remote attacker can
exploit this to bypass the firewall.");
  #https://www.paloaltonetworks.com/documentation/71/pan-os/pan-os-release-notes/pan-os-7-1-2-addressed-issues#75334
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c705875b");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Palo Alto Networks PAN-OS version 7.1.2 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/05/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/05/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/06/17");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:paloaltonetworks:pan-os");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Palo Alto Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2016-2018 Tenable Network Security, Inc.");

  script_dependencies("palo_alto_version.nbin");
  script_require_keys("Host/Palo_Alto/Firewall/Version", "Host/Palo_Alto/Firewall/Full_Version");

  exit(0);
}

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

app_name = "Palo Alto Networks PAN-OS";
version = get_kb_item_or_exit("Host/Palo_Alto/Firewall/Version");
full_version = get_kb_item_or_exit("Host/Palo_Alto/Firewall/Full_Version");
vuln = '7.1.1';
fix = '7.1.2';

# Ensure sufficient granularity.
if (version !~ "^\d+\.\d+") audit(AUDIT_VER_NOT_GRANULAR, app_name, full_version);

# Compare version to vuln and report as needed.
if (ver_compare(ver:version, fix:vuln, strict:FALSE) == 0)
{
    report =
      '\n  Installed version : ' + full_version +
      '\n  Fixed version     : ' + fix +
      '\n';
    security_report_v4(severity:SECURITY_WARNING, extra:report, port:0);
  exit(0);
}
else audit(AUDIT_INST_VER_NOT_VULN, app_name, full_version);