Asterisk RTP/RTCP Information Leak Vulnerability (AST-2017-008)

# 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:/a:digium:asterisk";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.140380");
  script_version("2023-12-19T05:05:25+0000");
  script_tag(name:"last_modification", value:"2023-12-19 05:05:25 +0000 (Tue, 19 Dec 2023)");
  script_tag(name:"creation_date", value:"2017-09-20 14:43:21 +0700 (Wed, 20 Sep 2017)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:N/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2017-11-04 01:29:00 +0000 (Sat, 04 Nov 2017)");

  script_cve_id("CVE-2017-14099", "CVE-2017-14603");

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

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

  script_name("Asterisk RTP/RTCP Information Leak Vulnerability (AST-2017-008)");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_family("General");
  script_dependencies("gb_digium_asterisk_sip_detect.nasl");
  script_mandatory_keys("digium/asterisk/detected");

  script_tag(name:"summary", value:"Asterisk is prone to an information leak in RTP/RTCP.");

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

  script_tag(name:"insight", value:"Insufficient RTCP packet validation could allow reading stale
  buffer contents and when combined with the 'nat' and 'symmetric_rtp' options allow redirecting where
  Asterisk sends the next RTCP report.

  The RTP stream qualification to learn the source address of media always accepted the first RTP
  packet as the new source and allowed what AST-2017-005 was mitigating. The intent was to qualify a
  series of packets before accepting the new source address.");

  script_tag(name:"impact", value:"An unauthenticated remote attacker may hijack the media stream.");

  script_tag(name:"affected", value:"Asterisk Open Source versions 11.x, 13.x, 14.x and Certified
  Asterisk versions 11.6 and 13.13.");

  script_tag(name:"solution", value:"Update to version 11.25.3, 13.17.2, 14.6.2, 11.6-cert18,
  13.13-cert6 or later.");

  script_xref(name:"URL", value:"http://downloads.asterisk.org/pub/security/AST-2017-008.html");

  exit(0);
}

include("host_details.inc");
include("revisions-lib.inc");
include("version_func.inc");

if (!port = get_app_port(cpe: CPE))
  exit(0);

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

if (version =~ "^11\.") {
  if (version =~ "^11\.6cert") {
    if (revcomp(a: version, b: "11.6cert18") < 0) {
      report = report_fixed_ver(installed_version: version, fixed_version: "11.6-cert18");
      security_message(port: port, data: report, proto: "udp");
      exit(0);
    }
  }
  else {
    if (version_is_less(version: version, test_version: "11.25.3")) {
      report = report_fixed_ver(installed_version: version, fixed_version: "11.25.3");
      security_message(port: port, data: report, proto: "udp");
      exit(0);
    }
  }
}

if (version =~ "^13\.") {
  if (version =~ "^13\.13cert") {
    if (revcomp(a: version, b: "13.13cert6") < 0) {
      report = report_fixed_ver(installed_version: version, fixed_version: "13.13-cert6");
      security_message(port: port, data: report, proto: "udp");
      exit(0);
    }
  }
  else {
    if (version_is_less(version: version, test_version: "13.17.2")) {
      report = report_fixed_ver(installed_version: version, fixed_version: "13.17.2");
      security_message(port: port, data: report, proto: "udp");
      exit(0);
    }
  }
}

if (version =~ "^14\.") {
  if (version_is_less(version: version, test_version: "14.6.2")) {
    report = report_fixed_ver(installed_version: version, fixed_version: "14.6.2");
    security_message(port: port, data: report, proto: "udp");
    exit(0);
  }
}

exit(0);