CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
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
77.8%
A vulnerability in the implementation of the DHCPv4 relay agent
in Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of
service (DoS) condition on an affected device.
# Copyright (C) 2016 Greenbone Networks GmbH
# 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-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
CPE = "cpe:/o:cisco:nx-os";
if (description)
{
script_oid("1.3.6.1.4.1.25623.1.0.106332");
script_version("2022-12-26T10:12:01+0000");
script_tag(name:"last_modification", value:"2022-12-26 10:12:01 +0000 (Mon, 26 Dec 2022)");
script_tag(name:"creation_date", value:"2016-10-06 10:44:47 +0700 (Thu, 06 Oct 2016)");
script_tag(name:"cvss_base", value:"7.8");
script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:C");
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:"2017-07-30 01:29:00 +0000 (Sun, 30 Jul 2017)");
script_cve_id("CVE-2015-6393");
script_tag(name:"qod_type", value:"remote_banner");
script_tag(name:"solution_type", value:"VendorFix");
script_name("Cisco NX-OS Software Malformed DHCPv4 Packet Denial of Service Vulnerability (cisco-sa-20161005-dhcp2)");
script_category(ACT_GATHER_INFO);
script_copyright("Copyright (C) 2016 Greenbone Networks GmbH");
script_family("CISCO");
script_dependencies("gb_cisco_nx_os_consolidation.nasl");
script_mandatory_keys("cisco/nx_os/detected", "cisco/nx_os/device", "cisco/nx_os/model");
script_tag(name:"summary", value:"A vulnerability in the implementation of the DHCPv4 relay agent
in Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of
service (DoS) condition on an affected device.");
script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");
script_tag(name:"insight", value:"The vulnerability is due to improper validation of malformed
DHCPv4 packets. An attacker could exploit this vulnerability by sending malformed DHCPv4 packets
to an affected device.");
script_tag(name:"impact", value:"An exploit could allow the attacker to cause the DHCP process or
device to crash.");
script_tag(name:"solution", value:"See the referenced vendor advisory for a solution.");
script_xref(name:"URL", value:"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161005-dhcp2");
exit(0);
}
include("host_details.inc");
include("version_func.inc");
if( ! device = get_kb_item( "cisco/nx_os/device" ) )
exit( 0 );
if( "Nexus" >!< device )
exit( 0 );
if ( ! nx_model = get_kb_item( "cisco/nx_os/model" ) )
exit( 0 );
if( ! version = get_app_version( cpe:CPE, nofork:TRUE ) )
exit( 0 );
if( nx_model =~ "^C?5[0-9]+" ) {
affected = make_list(
"4.2(1)N1(1)",
"4.2(1)N2(1)",
"4.2(1)N2(1a)",
"5.0(2)N1(1)",
"5.0(2)N2(1)",
"5.0(2)N2(1a)",
"5.0(3)N1(1c)",
"5.0(3)N2(1)",
"5.0(3)N2(2)",
"5.0(3)N2(2a)",
"5.0(3)N2(2b)",
"5.1(3)N1(1)",
"5.1(3)N1(1a)",
"5.1(3)N2(1)",
"5.1(3)N2(1a)",
"5.1(3)N2(1b)",
"5.1(3)N2(1c)",
"5.2(1)N1(1)",
"5.2(1)N1(1a)",
"5.2(1)N1(1b)",
"5.2(1)N1(2)",
"5.2(1)N1(2a)",
"5.2(1)N1(3)",
"5.2(1)N1(4)",
"5.2(1)N1(5)",
"5.2(1)N1(6)",
"5.2(1)N1(7)",
"5.2(1)N1(8)",
"5.2(1)N1(8a)"
);
}
if( nx_model =~ "^C?6[0-9]+" ) {
affected = make_list(
"6.0(2)N1(2)",
"6.0(2)N1(2a)",
"6.0(2)N2(1)",
"6.0(2)N2(1b)",
"6.0(2)N2(2)",
"6.0(2)N2(3)",
"6.0(2)N2(4)",
"6.0(2)N2(5)",
"6.0(2)N2(5a)",
"6.0(2)N2(6)",
"7.0(0)N1(1)",
"7.0(1)N1(1)",
"7.0(2)N1(1)",
"7.0(3)N1(1)",
"7.0(4)N1(1)",
"7.0(5)N1(1)",
"7.0(5)N1(1a)",
"7.1(0)N1(1a)",
"7.1(0)N1(1b)"
);
}
if( nx_model =~ "^C?7[0-9]+" ) {
affected = make_list(
"4.1.(2)",
"4.1.(3)",
"4.1.(4)",
"4.1.(5)",
"4.2(3)",
"4.2(4)",
"4.2(6)",
"4.2(8)",
"4.2.(2a)",
"5.0(2a)",
"5.0(3)",
"5.0(5)",
"5.1(1)",
"5.1(1a)",
"5.1(3)",
"5.1(4)",
"5.1(5)",
"5.1(6)",
"5.2(1)",
"5.2(3a)",
"5.2(4)",
"5.2(5)",
"5.2(7)",
"5.2(9)",
"6.0(1)",
"6.0(2)",
"6.0(3)",
"6.0(4)",
"6.1(1)",
"6.1(2)",
"6.1(3)",
"6.1(4)",
"6.1(4a)",
"6.1(5)",
"6.2(10)",
"6.2(12)",
"6.2(14)S1",
"6.2(2)",
"6.2(2a)",
"6.2(6)",
"6.2(6b)",
"6.2(8)",
"6.2(8a)",
"6.2(8b)",
"7.2(0)N1(0.1)"
);
}
if( nx_model =~ "^C?9[0-9]{3}" ) {
affected = make_list(
"6.1(2)I2(1)",
"6.1(2)I2(2)",
"6.1(2)I2(2a)",
"6.1(2)I2(2b)",
"6.1(2)I2(3)",
"6.1(2)I3(1)",
"6.1(2)I3(2)",
"6.1(2)I3(3)",
"6.1(2)I3(3.78)",
"6.1(2)I3(4)",
"7.0(3)"
);
}
foreach af ( affected ) {
if( version == af ) {
report = report_fixed_ver( installed_version:version, fixed_version:"See advisory" );
security_message( port:0, data:report );
exit( 0 );
}
}
exit( 99 );
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
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
77.8%