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Originally Posted by arivero
Someone with a copy of 2.4 filesystem (I lost mine) could send to you, or to mobileread ftp site, a copy of the dropbear inside. You need also to replace /etc/passwd or to create a new user, and I think that the integrity of /etc/passwd (as well as the integrity of the registry) is checked now during the startup. Netcat had the adventage of not needing to know the root password nor to change it, and it was to be run in any nontrivial port, so relatively safe from scanners.
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You could compile tsh statically with the Zaurus toolchain. It will easily run on any port and the executable is tiny. I use it as a backdoor to rescue broken systems remotely.
http://freshmeat.net/projects/tsh/