CVE-2018-11784 — AI Deep Analysis Summary

🚨 **Essence**: Apache Tomcat's default servlet fails to sanitize user input, allowing **Open Redirects**.…

🛡️ **Root Cause**: **Input Validation Error**. The server does not properly validate the URL provided in the request. 📌 **CWE**: Implicitly related to improper input handling (CWE-601 Open Redirect).

📦 **Affected Products**: Apache Tomcat. 📅 **Vulnerable Versions**: 9.0.0.M1 - 9.0.11, 8.5.0 - 8.5.33, 7.0.23 - 7.0.90. 🏢 **Vendor**: Apache Software Foundation.

💻 **Attacker Actions**: Redirect victims to **arbitrary web sites**. 🎣 **Impact**: Phishing attacks, credential theft, or malware delivery via deceptive links. No direct server compromise.

⚡ **Threshold**: **LOW**. No authentication required. 🌐 **Config**: Exploits the **default servlet** configuration. Any user accessing the vulnerable URL endpoint can trigger it.

🔓 **Public Exp?**: **YES**. PoC available on GitHub (Cappricio-Securities) and Nuclei templates. 🚀 **Wild Exploitation**: Easy to automate for phishing campaigns.

🔍 **Self-Check**: Scan for Tomcat versions in the vulnerable ranges. 🧪 **Test**: Send a crafted URL with a redirect parameter to the default servlet and check if it redirects to an external domain.

🩹 **Official Fix**: **YES**. Patched in Tomcat 9.0.12+, 8.5.34+, and 7.0.91+. 📥 **Action**: Upgrade to the latest stable version immediately.

🚧 **No Patch?**: Implement a **WAF rule** to block suspicious redirect parameters. 🛑 **Mitigation**: Restrict access to the default servlet or disable it if not needed.

⚠️ **Urgency**: **HIGH**. Easy to exploit for phishing. 🏃 **Priority**: Patch immediately to prevent social engineering attacks against your users.