Pikachu之SSRF解题

男娘i 2023-10-06 18:12 46阅读 0赞

#### 目录 ####

*   *  SSRF(curl)
     *  SSRF(file\_get\_content)

**SSRF(Server-Side Request Forgery:服务器端请求伪造)**  
其形成的原因大都是由于服务端提供了从其他服务器应用获取数据的功能,但又没有对目标地址做严格过滤与限制

导致攻击者可以传入任意的地址来让后端服务器对其发起请求,并返回对该目标地址请求的数据

数据流:攻击者----->服务器---->目标地址

根据后台使用的函数的不同,对应的影响和利用方法又有不一样

PHP中下面函数的使用不当会导致SSRF:
    file_get_contents()
    fsockopen()
    curl_exec()

如果一定要通过后台服务器远程去对用户指定(“或者预埋在前端的请求”)的地址进行资源请求,则请做好目标地址的过滤。

### SSRF(curl) ###

登录靶场，找到SSRF(curl)，并根据提示点击  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1bzE1ODkwMDI1MDE5_size_16_color_FFFFFF_t_70]  
bp抓取请求包  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1bzE1ODkwMDI1MDE5_size_16_color_FFFFFF_t_70 1]  
可以看出，在url中又请求了一个url。我们在内网环境搭建一个网站，然后将url中的内容替换一下  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1bzE1ODkwMDI1MDE5_size_16_color_FFFFFF_t_70 2]  
发送请求，访问内网网站成功  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1bzE1ODkwMDI1MDE5_size_16_color_FFFFFF_t_70 3]

### SSRF(file\_get\_content) ###

找到SSRF(file\_get\_content)，根据提示点击  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1bzE1ODkwMDI1MDE5_size_16_color_FFFFFF_t_70 4]  
bp抓取请求包  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1bzE1ODkwMDI1MDE5_size_16_color_FFFFFF_t_70 5]  
可以看到，url中可以读取文件（file\_get\_content 可以对本地和远程的文件进行读取）。  
比如读取本地文件  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1bzE1ODkwMDI1MDE5_size_16_color_FFFFFF_t_70 6]

成功读取  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1bzE1ODkwMDI1MDE5_size_16_color_FFFFFF_t_70 7]  
或者如下构造  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1bzE1ODkwMDI1MDE5_size_16_color_FFFFFF_t_70 8]

正确读取文件内容  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1bzE1ODkwMDI1MDE5_size_16_color_FFFFFF_t_70 9]

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