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Command hijack-fd

gef can be used to modify file descriptors of the debugged process. The new file descriptor can point to a file, a pipe, a socket, a device etc.

To use it, simply run

gef➤ hijack-fd FDNUM NEWFILE

For instance,

gef➤ hijack-fd 1 /dev/null

Will modify the current process file descriptors to redirect STDOUT to /dev/null.

This command also supports connecting to an ip:port if it is provided as an argument. For example

gef➤ hijack-fd 0 localhost:8888

Will redirect STDIN to localhost:8888

Check out the tutorial on GEF's YouTube channel: