CVE-2020-11108 — AI Deep Analysis Summary

🚨 **Essence**: Pi-hole Gravity updater has a code flaw allowing PHP file injection. 💥 **Consequences**: Remote Code Execution (RCE) & Privilege Escalation to Root.…

🛡️ **Root Cause**: Flaw in `gravity_DownloadBlocklistFromUrl` function. 📝 **CWE**: Not specified in data, but implies **Insecure File Write** / **Path Traversal** allowing arbitrary file creation.

📦 **Affected**: Pi-hole versions **4.4 and earlier**. 🧩 **Component**: Gravity updater plugin. 🌐 **Product**: Pi-hole (Network-level ad blocker).

💻 **Hackers Can**: Execute arbitrary code. 🗝️ **Privileges**: Start as `www-data` user, then **escalate to Root**. 📂 **Data**: Full control over the server via injected PHP files.

🔓 **Threshold**: Low. ⚠️ **Auth**: Likely requires web access to the Pi-hole interface. 📡 **Config**: Exploits the automatic update mechanism (Gravity). No complex setup needed for initial RCE.

🔥 **Public Exp**: YES. 📂 **PoC**: Available on GitHub (Frichetten). 🛠️ **Tools**: `cve-2020-11108-rce.py` (Shell as www-data) & `root-cve-2020-11108-rce.py` (Root shell). 📢 **Status**: Actively exploited/documented.

🔍 **Check**: Scan for Pi-hole v4.4 or older. 📂 **Verify**: Look for unauthorized PHP files in web directories. 📡 **Monitor**: Unusual network requests to blocklist URLs.…

🆕 **Fixed**: YES. 📅 **Date**: Published May 11, 2020. 🔄 **Action**: Update Pi-hole to version **4.5+** or latest. 🛡️ **Official Patch**: Available via standard Pi-hole update commands.

🚧 **Workaround**: If unpatched, **disable Gravity updater** temporarily. 🔒 **Restrict Access**: Block external access to Pi-hole web interface.…

🔴 **Urgency**: HIGH. 🚨 **Priority**: Critical. 💥 **Impact**: Full Server Compromise (Root). ⏳ **Time**: Exploits are public. 🛡️ **Action**: Patch IMMEDIATELY. Do not delay.