LT 'syreal' Jones
Download the disk image and use mmls on it to find the size of the Linux partition. Connect to the remote checker service to check your answer and get the flag. Note: if you are using the webshell, download and extract the disk image into /tmp not your home directory.
- Download disk image
- Access checker program:
nc saturn.picoctf.net 52279
A gzip file is compressed data, it's similar to a zip file. There's smomething inside the gzip so we can take a look. Open the gizp using 7zip then extract the file (there are other methods using terminal but 7zip is easy to do).
Extract disk.img. We can read the hint and do literally that.
$ mmls disk.img
DOS Partition Table
Offset Sector: 0
Units are in 512-byte sectors
Slot Start End Length Description
000: Meta 0000000000 0000000000 0000000001 Primary Table (#0)
001: ------- 0000000000 0000002047 0000002048 Unallocated
002: 000:000 0000002048 0000204799 0000202752 Linux (0x83)
Great! Now we know the size of the Linux partition is 202752 (length of the 2nd partition) we can connect to the shell and get our flag.
$ nc saturn.picoctf.net 52279
What is the size of the Linux partition in the given disk image?
Length in sectors: 202752
202752
Great work!
picoCTF{mm15_f7w!}
picoCTF{mm15_f7w!}