cisco-sa-20180328-dhcpr3: Cisco IOS and IOS XE Software DHCP Version 4 Relay Denial of Service Vulnerability
First published: Wed Mar 28 2018(Updated: )
A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of option 82 information that it receives in DHCP Version 4 (DHCPv4) packets from DHCP relay agents. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr3 This advisory is part of the March 28, 2018, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes 20 Cisco Security Advisories that describe 22 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: March 2018 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication.
Credit: Tenable for finding reporting this vulnerability.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS | ||
| Cisco IOS XE Software |
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Reference Links
Frequently Asked Questions
What is the severity of cisco-sa-20180328-dhcpr3?
The severity of cisco-sa-20180328-dhcpr3 is categorized as high due to its potential to cause a denial of service.
How do I fix cisco-sa-20180328-dhcpr3?
To fix cisco-sa-20180328-dhcpr3, upgrade to a version of Cisco IOS or IOS XE that includes the necessary security patches.
Who is affected by cisco-sa-20180328-dhcpr3?
Devices running affected versions of Cisco IOS Software and Cisco IOS XE Software are at risk from cisco-sa-20180328-dhcpr3.
What type of attack does cisco-sa-20180328-dhcpr3 involve?
cisco-sa-20180328-dhcpr3 involves an unauthenticated, remote attacker exploiting the DHCP option 82 encapsulation functionality.
What are the potential impacts of cisco-sa-20180328-dhcpr3?
The potential impacts of cisco-sa-20180328-dhcpr3 include device reloads and denial of service (DoS) conditions.
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