FreeRADIUS Tunnel-Password Denial Of Service Vulnerability

# SPDX-FileCopyrightText: 2009 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

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.900856");
  script_version("2025-03-05T05:38:52+0000");
  script_tag(name:"last_modification", value:"2025-03-05 05:38:52 +0000 (Wed, 05 Mar 2025)");
  script_tag(name:"creation_date", value:"2009-09-23 08:37:26 +0200 (Wed, 23 Sep 2009)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_cve_id("CVE-2009-3111");
  script_name("FreeRADIUS Tunnel-Password Denial Of Service Vulnerability");

  script_xref(name:"URL", value:"http://secunia.com/advisories/36509");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/36263");
  script_xref(name:"URL", value:"http://www.intevydis.com/blog/?p=66");
  script_xref(name:"URL", value:"http://www.openwall.com/lists/oss-security/2009/09/09/1");
  script_xref(name:"URL", value:"http://www.braindeadprojects.com/blog/what/freeradius-packet-of-death/");
  script_xref(name:"URL", value:"https://lists.freeradius.org/pipermail/freeradius-users/2009-September/msg00242.html");

  script_category(ACT_GATHER_INFO);
  script_tag(name:"qod_type", value:"executable_version");
  script_copyright("Copyright (C) 2009 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("secpod_freeradius_detect.nasl");
  script_mandatory_keys("FreeRADIUS/Ver");
  script_tag(name:"impact", value:"Successful exploitation will allow an attacker to crash the service.");
  script_tag(name:"affected", value:"FreeRADIUS version prior to 1.1.8.");
  script_tag(name:"insight", value:"The flaws are due to:

  - An error in the 'rad_decode()' function in 'src/lib/radius.c' which can
    be exploited via zero-length Tunnel-Password attributes.

  - An unspecified error that can be exploited to crash the 'radiusd' daemon.");
  script_tag(name:"summary", value:"FreeRADIUS is prone to a Denial of Service vulnerability.");
  script_tag(name:"solution", value:"Upgrade to version 1.1.8.");

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

  script_xref(name:"URL", value:"http://github.com/alandekok/freeradius-server/commit/860cad9e02ba344edb0038419e415fe05a9a01f4");
  exit(0);
}

include("version_func.inc");

foreach radius_port (make_list(1812, 1813, 1814))
{
  if(get_udp_port_state(radius_port))
  {
    freeradiusVer = get_kb_item("FreeRADIUS/Ver");
    if(freeradiusVer)
    {
      if(version_is_less(version:freeradiusVer, test_version:"1.1.8")){
        report = report_fixed_ver(installed_version:freeradiusVer, fixed_version:"1.1.8");
        security_message(port: radius_port, data: report);
        exit(0);
      }
    }
  }
}

exit(99);