metasploit 中 exploit模块check方法简介

左手的ㄟ右手 2021-07-29 02:19 630阅读 0赞

Exploit模块的check方法用来检测一台远程主机是否有漏洞能够被利用。

check方法默认的实施仅返回check方法不被Exploit模块支持。

当然，一个完整的代码能够从check方法返回如下表所示的信息。

![20191104220536868.jpg][]

如果在我们编写Exploit模块的时候没有编写check方法，当我们在Msfconsole中输入check时，会调用 Msf::Module 中定义好的check方法，并返回 Msf::Exploit::CheckCode::Unsupported 这个常量。

根据Ruby语法，当我们在Exploit模块中再次定义check方法时，便会覆盖继承的check方法，从而我们可以具体情况选择返回值，例如：

def check
        if ***
            return Exploit::CheckCode::Vulnerable
        end
        return Exploit::CheckCode::Safe
    end

所有的常量信息在Msf::Exploit::CheckCode模块中定义如下：

<table> 
 <tbody> 
 <tr> 
 <td style="vertical-align:top;"> Unknown = [ 'unknown', "Cannot reliably check exploitability."] </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Can't tell if the target is exploitable or not. This is recommended if the module fails to retrieve enough information from the target machine, such as due to a timeout. </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Safe = [ 'safe', "The target is not exploitable." ] </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> The target is safe and is therefore not exploitable. This is recommended after the check fails to trigger the vulnerability, or even detect the service. </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Detected = [ 'detected', "The target service is running, but could not be validated." ] </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> The target is running the service in question, but the check fails to determine whether the target is vulnerable or not. </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Appears = [ 'appears', "The target appears to be vulnerable." ] </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> The target appears to be vulnerable. This is recommended if the vulnerability is determined based on passive reconnaissance. For example: version, banner grabbing, or having the resource that's known to be vulnerable. </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Vulnerable = [ 'vulnerable', "The target is vulnerable." ] </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> The target is vulnerable. Only used if the check is able to actually take advantage of the bug, and obtain hard evidence. For example: executing a command on the target machine, and retrieve the output. </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> Unsupported = [ 'unsupported', "This exploit does not support check." ] </td> 
 </tr> 
 <tr> 
 <td style="vertical-align:top;"> The exploit does not support the check method. </td> 
 </tr> 
 </tbody> 
</table>

常量数组中的第二个元素即为check方法的返回值，例如：

![20191104220446905.jpg][]

[20191104220536868.jpg]: /images/20210728/fc5f1accec9d4fbb955f35a7dd153a5a.png
[20191104220446905.jpg]: /images/20210728/3866d0c7cdbf4b7bb53644a8b3f6297c.png