CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
86.3%
Asterisk is prone to a SDP offer denial of service (DoS)
vulnerability.
# SPDX-FileCopyrightText: 2016 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("1.3.6.1.4.1.25623.1.0.106461");
script_version("2023-12-20T12:22:41+0000");
script_cve_id("CVE-2016-9937");
script_tag(name:"last_modification", value:"2023-12-20 12:22:41 +0000 (Wed, 20 Dec 2023)");
script_tag(name:"creation_date", value:"2016-12-09 14:10:48 +0700 (Fri, 09 Dec 2016)");
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_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
script_tag(name:"severity_origin", value:"NVD");
script_tag(name:"severity_date", value:"2017-07-27 01:29:00 +0000 (Thu, 27 Jul 2017)");
script_tag(name:"qod_type", value:"remote_banner_unreliable");
script_tag(name:"solution_type", value:"VendorFix");
script_name("Asterisk SDP Offer DoS Vulnerability (AST-2016-008)");
script_category(ACT_GATHER_INFO);
script_copyright("Copyright (C) 2016 Greenbone AG");
script_family("Denial of Service");
script_dependencies("gb_digium_asterisk_sip_detect.nasl");
script_mandatory_keys("digium/asterisk/detected");
script_tag(name:"summary", value:"Asterisk is prone to a SDP offer denial of service (DoS)
vulnerability.");
script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");
script_tag(name:"insight", value:"If an SDP offer or answer is received with the Opus codec and
with the format parameters separated using a space the code responsible for parsing will recursively
call itself until it crashes. This occurs as the code does not properly handle spaces separating the
parameters. This does NOT require the endpoint to have Opus configured in Asterisk. This also does
not require the endpoint to be authenticated. If guest is enabled for chan_sip or anonymous in
chan_pjsip an SDP offer or answer is still processed and the crash occurs.");
script_tag(name:"impact", value:"An unauthenticated remote attacker may cause a denial of service
condition.");
script_tag(name:"affected", value:"Asterisk Open Source 13.12.0 prior to 13.13.1 and 14.x prior
to 14.2.1.");
script_tag(name:"solution", value:"Update to version 13.13.1, 14.2.1 or later.");
script_xref(name:"URL", value:"http://downloads.asterisk.org/pub/security/AST-2016-008.html");
script_xref(name:"URL", value:"http://www.securityfocus.com/bid/94792");
exit(0);
}
include("host_details.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 =~ "^13\.") {
if ( version_in_range(version: version, test_version: "13.12.0", test_version2: "13.13.0")) {
report = report_fixed_ver(installed_version: version, fixed_version: "13.13.1");
security_message(port: port, data: report, proto: "udp");
exit(0);
}
}
if (version =~ "^14\.") {
if (version_is_less(version: version, test_version: "14.2.1")) {
report = report_fixed_ver(installed_version: version, fixed_version: "14.2.1");
security_message(port: port, data: report, proto: "udp");
exit(0);
}
}
exit(0);
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
86.3%