Common Attack Pattern Enumeration and Classification
A Community Resource for Identifying and Understanding Attacks
An attacker sends an ICMP Type 17 Address Mask Request to gather information about a target's networking configuration. ICMP Address Mask Requests are defined by RFC-950, "Internet Standard Subnetting Procedure." An Address Mask Request is an ICMP type 17 message that triggers a remote system to respond with a list of its related subnets, as well as its default gateway and broadcast address via an ICMP type 18 Address Mask Reply datagram. Gathering this type of information helps an attacker plan router-based attacks as well as denial-of-service attacks against the broadcast address. Many modern operating systems will not respond to ICMP type 17 messages for security reasons. Determining whether a system or router will respond to an ICMP Address Mask Request helps the attacker determine operating system or firmware version. Additionally, because these types of messages are rare they are easily spotted by intrusion detection systems. Many ICMP scanning tools support IP spoofing to help conceal the origin of the actual request among a storm of similar ICMP messages. It is a common practice for border firewalls and gateways to be configured to block ingress ICMP type 17 and egress ICMP type 18 messages.
Target Attack Surface Description
Targeted OSI Layers: Network Layer
Target Attack Surface Localities
Target Attack Surface Types: Network Host
The ability to send custom ICMP queries. This can be accomplished via the use of various scanners or utilities. The following tools allow a user to craft custom ICMP messages when performing reconnaissance:
[R.294.1] [REF-20] Stuart McClure, Joel Scambray and George Kurtz. "Hacking Exposed: Network Security Secrets & Solutions". Chapter 2: Scanning, pp. 53-54. 6th Edition. McGraw Hill. 2009.
[R.294.2] J. Mogul and J. Postel. "RFC950 - Internet Standard Subnetting Procedure". August 1985. <http://www.faqs.org/rfcs/rfc950.html>.
[R.294.3] [REF-23] J. Postel. "RFC792 - Internet Control Messaging Protocol". Defense Advanced Research Projects Agency (DARPA). September 1981. <http://www.faqs.org/rfcs/rfc792.html>.
[R.294.4] [REF-28] Mark Wolfgang. "Host Discovery with Nmap". November 2002. <http://nmap.org/docs/discovery.pdf>.
[R.294.5] [REF-22] Gordon "Fyodor" Lyon. "Nmap Network Scanning: The Official Nmap Project Guide to Network Discovery and Security Scanning". Section 3.7.2 ICMP Probe Selection, pg. 70. 3rd "Zero Day" Edition,. Insecure.com LLC, ISBN: 978-0-9799587-1-7. 2008.
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