CVE-2021-34429 — AI Deep Analysis Summary

🚨 **Essence**: Eclipse Jetty allows attackers to bypass security constraints using encoded URIs. 📉 **Consequences**: Sensitive files in the `WEB-INF` directory can be disclosed, leading to information leakage.

🛡️ **Root Cause**: CWE-200 (Information Exposure). The flaw lies in improper authorization handling where encoded characters trick the server into revealing protected content.

📦 **Affected Versions**: - Jetty 9.4.37 - 9.4.42 - Jetty 10.0.1 - 10.0.5 - Jetty 11.0.1 - 11.0.5 🏢 **Vendor**: The Eclipse Foundation.

💀 **Attacker Capabilities**: - Access `WEB-INF` contents (usually restricted). - Bypass security constraints. - Obtain sensitive configuration/data. - Potential for unauthorized admin operations.

⚡ **Exploitation Threshold**: LOW. - **Auth**: None required (PR:N). - **Network**: Remote (AV:N). - **Complexity**: Low (AC:L). No user interaction needed (UI:N).

🔓 **Public Exploits**: YES. Multiple PoCs exist on GitHub (e.g., ColdFusionX, Nuclei templates). Wild exploitation is highly feasible due to simple URI encoding tricks.

🔍 **Self-Check**: - Scan for Jetty versions listed above. - Use Nuclei templates for CVE-2021-34429. - Test if encoded URIs access `/WEB-INF/` paths. - Check for similar patterns to CVE-2021-28164.

✅ **Official Fix**: YES. The vendor released patches.…

🛠️ **No Patch Workaround**: - Implement WAF rules to block encoded URI patterns targeting `WEB-INF`. - Restrict direct access to `WEB-INF` at the reverse proxy level (Nginx/Apache). - Disable unnecessary Jetty features.

🔥 **Urgency**: HIGH. CVSS Score indicates easy remote exploitation with data leakage impact. Immediate patching or WAF mitigation is recommended for all affected instances.