- The configuration token method is vulnerable to interception, and
- The delayed authentication mechanism is vulnerable to DDoS floods.
For example, DHCP_Gobbler is a proof of concept tool that attacks RFC 3118 by grabbing all available DHCP addresses, preventing allocation to legitimate new machines.
To learn more about DHCP improvements related to security and more, visit the IETF's DHC working group page -- for example, see Internet Drafts regarding DHCP authentication with IPv6 and DHCP Relay.
Note that DHCP can be used by any kind of IP network, including wireless LANs. Wireless LANs are inherently more vulnerable to interception and flooding than privately-operated Ethernet LANs. Link encryption (WPA/WPA2) can be used to prevent DHCP request interception on a wireless LAN. Preventing flooding is trickier, since you can't really prevent wireless stations from transmitting. However, you CAN stop transmitted packets from reaching your DHCP server -- for example, by using 802.1X port access control.
Dig Deeper on Wireless LAN (WLAN)
Related Q&A from Lisa Phifer
Learn the differences between site-to-site VPNs vs. remote-access VPNs and find out about the protocols, benefits and the data security methods used ... Continue Reading
Understanding the functions of a wireless access point vs. wireless router will help you deploy the right device for the right circumstance. Continue Reading
Need to send an email, check your flight's status or get ready for a presentation? You can do it all on your smartwatch, thanks to a slew of Apple ... Continue Reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.