Palo Alto PAN-OS Kernel Vulnerability

# SPDX-FileCopyrightText: 2017 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

CPE = "cpe:/o:paloaltonetworks:pan-os";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.106826");
  script_version("2026-04-28T06:28:06+0000");
  script_tag(name:"last_modification", value:"2026-04-28 06:28:06 +0000 (Tue, 28 Apr 2026)");
  script_tag(name:"creation_date", value:"2017-05-23 15:33:39 +0700 (Tue, 23 May 2017)");
  script_tag(name:"cvss_base", value:"5.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2018-01-05 02:31:00 +0000 (Fri, 05 Jan 2018)");

  script_cve_id("CVE-2016-5696");

  script_tag(name:"qod_type", value:"package");

  script_tag(name:"solution_type", value:"VendorFix");

  script_name("Palo Alto PAN-OS Kernel Vulnerability");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_family("Palo Alto PAN-OS Local Security Checks");
  script_dependencies("gb_paloalto_panos_consolidation.nasl");
  script_mandatory_keys("palo_alto_pan_os/version");

  script_tag(name:"summary", value:"A vulnerability exists in the kernel of PAN-OS that may result in
Information Disclosure.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"insight", value:"The challenge ACK rate limiting in the kernel's networking subsystem may
allow an off-path attacker to leak certain information about a given connection by creating congestion on the
global challenge ACK rate limit counter and then measuring the changes by probing packets.");

  script_tag(name:"affected", value:"PAN-OS 6.1, PAN-OS 7.0.15 and earlier, PAN-OS 7.1.9 and earlier.");

  script_tag(name:"solution", value:"Update to PAN-OS 7.0.16, 7.1.10 or later.");

  script_xref(name:"URL", value:"https://securityadvisories.paloaltonetworks.com/Home/Detail/85");

  exit(0);
}

include("host_details.inc");
include("version_func.inc");

if (!version = get_app_version(cpe: CPE, nofork: TRUE))
  exit(0);

model = get_kb_item("palo_alto_pan_os/model");

if (version_is_less(version: version, test_version: "7.0.16")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "7.0.16");

  if (model)
    report += '\nModel:             ' + model;

  security_message(port: 0, data: report);
  exit(0);
}

if (version =~ "^7\.1\.") {
  if (version_is_less(version: version, test_version: "7.1.10")) {
    report = report_fixed_ver(installed_version: version, fixed_version: "7.1.10");

    if (model)
      report += '\nModel:             ' + model;

    security_message(port: 0, data: report);
    exit(0);
  }
}

exit(99);