Cisco Ios Improper Input Validation

high Tenable.ot Plugin ID 500317
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

A vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a Relay Reply denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of encapsulated option 82 information that it receives in DHCPOFFER messages from DHCPv4 servers. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device, which the device would then forward to a DHCPv4 server. When the affected software processes the option 82 information that is encapsulated in the response from the server, an error could occur. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvg62754.

Solution

Refer to vendor advisory for Security Updates

See Also

http://www.securityfocus.com/bid/103545

http://www.securitytracker.com/id/1040591

https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04

https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr2

https://www.tenable.com/security/research/tra-2018-06

Plugin Details

Severity: High

ID: 500317

Version: 1.0

Type: local

Family: SCADA

Published: 11/8/2019

Updated: 11/8/2019

Risk Information

CVSS Score Source: CVE-2018-0173

CVSS v2

Risk Factor: High

Base Score: 7.8

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS v3

Risk Factor: High

Base Score: 8.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Vulnerability Information

CPE: cpe:2.3:o:cisco:ios:denali-16.3.4:*:*:*:*:*:*:*, cpe:2.3:o:cisco:ios_xe:denali-16.3.4:*:*:*:*:*:*:*, cpe:2.3:h:cisco:4321_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:4331_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:4351_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:4431_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:4451-x_integrated_services_router:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:asr_1000_series_route_processor_\(rp2\):-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:asr_1000_series_route_processor_\(rp3\):-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:asr_1001-hx:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:asr_1001-x:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:asr_1002-hx:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:asr_1002-x:-:*:*:*:*:*:*:*, cpe:2.3:h:cisco:cloud_services_router_1000v:-:*:*:*:*:*:*:*, cpe:2.3:o:cisco:ios:denali-16.3.4:*:*:*:*:*:*:*, cpe:2.3:o:cisco:ios_xe:denali-16.3.4:*:*:*:*:*:*:*, cpe:2.3:h:rockwellautomation:allen-bradley_armorstratix_5700:-:*:*:*:*:*:*:*, cpe:2.3:h:rockwellautomation:allen-bradley_stratix_5400:-:*:*:*:*:*:*:*, cpe:2.3:h:rockwellautomation:allen-bradley_stratix_5410:-:*:*:*:*:*:*:*, cpe:2.3:h:rockwellautomation:allen-bradley_stratix_5700:-:*:*:*:*:*:*:*, cpe:2.3:h:rockwellautomation:allen-bradley_stratix_8000:-:*:*:*:*:*:*:*, cpe:2.3:h:rockwellautomation:allen-bradley_stratix_8300:-:*:*:*:*:*:*:*

Patch Publication Date: 3/28/2018

Vulnerability Publication Date: 3/28/2018

Reference Information

CVE: CVE-2018-0173