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Wild-ass TCP tools. More goodness from Dan Kaminsky: he's gone gold on "Paketto Keiretsu 1.0," a suite of TCP hacking tools, including a wild-ass visualizer and Paratrace. Paratrace traces the path between a client and a server, much like "traceroute", but with a major twist: Rather than iterate the TTLs of UDP, ICMP, or even TCP SYN packets, paratrace attaches itself to an existing, stateful- firewall-approved TCP flow, statelessly releasing as many TCP Keepalive messages as the software estimates the remote host is hop-distant. The resultant ICMP Time Exceeded replies are analyzed, with their original hopcount "tattooed" in the IPID field copied into the returned packets by so many helpful routers. Through this process, paratrace can trace a route without modulating a single byte of TCP/Layer 4, and thus delivers fully valid (if occasionally redundant) segments at Layer 4 -- segments generated by another process entirely. Link Discuss [Boing Boing Blog] |
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© Copyright
2002
Eric Hartwell.
Last update:
12/3/2002; 9:26:00 PM.
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