![]() ![]() NIT was a network interface that Sun used, but has been replaced in later releases of SunOS/Solaris with DLPI. LLI was a network interface that SCO used, which has been augmented with DLPI support as of SCO OpenServer Release V. To packet sniff, obtain or code a packet sniffer that is capable of working with the type of network interface that the operating system supports: The most common criterion for an interesting packet is one that contains words like “login” or “password.” When the software sees a packet that fits certain criteria, it logs it to a file. However, attacks performed by installing software on switches (e.g., using default passwords) generally cannot be detected this way, and most smaller organizations don't deploy intrusion detection systems today.Packet sniffing is listening (with software) to the raw network device for interesting packets. Intrusion detection systems may be able to detect log records resulting from some techniques of getting the traffic to the attacker's system. However, it is impossible to control all switches and routers on long-distance connections. Such configurations may make this attack difficult. Some enterprises hard-code MAC addresses for each network port in switches and update and set passwords on switches. However, it is often possible to fool switches to send traffic to any host, or perform the attack on the switch itself. Today, networks use switches and star-like topologies, which make this more difficult. Thus, it was enough to put a network interface into promiscuous mode to see all traffic. In the 1990s, thick ethernet was common, and every host typically saw all traffic in the network. However, encryption is the only reliable solution, and due to man-in-the-middle attack risks, the encryption must include proper authentication of communicating parties. Here are just some examples:īuild an FTP Password Sniffer with Scapy and Pythonīesides adding encryption, various other developments have made wide-scale password sniffing somewhat more difficult. There are many implementations of password sniffers, many dating back to 1990s. Furthermore, traffic naturally goes through switches and routers, so no extra network packets need to be sent to fool switches into sending traffic of interest to the listening node. They don't run anti-virus and aren't easy to audit. It is common nowadays for attackers to install presence on such devices. The attack can also be performed in switches, routers, and printers. ![]() It took me three hours to have a program that processed the data from each TCP/IP stream separately and extracted information from them. I (Tatu Ylönen) once tried to implement such an attack as an experiment. (A similar approach can be applied to other credentials.) The password sniffer is a small program that listens to all traffic in the attached network(s), builds data streams out of TCP/IP packets, and extracts user names and passwords from those streams that contain protocols that send cleartext passwords. The typical implementation of a password sniffing attack involves gaining access to a computer connected to a local area network and installing a password sniffer on it. Contents Typical Password Sniffing Implementation Existing Implementations Modern Complications Videos on Password Sniffing Typical Password Sniffing Implementation
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