CVE-2021-47812 — AI Deep Analysis Summary

🚨 **Essence**: Unauthenticated Arbitrary YAML Write in GravCMS 1.10.7. <br>💥 **Consequences**: Attackers can inject malicious YAML configs, leading to **Remote Code Execution (RCE)** via the scheduler endpoint.…

🛡️ **Root Cause**: **CWE-862** (Missing Authorization). <br>🔍 **Flaw**: The system fails to validate user permissions before allowing writes to critical YAML configuration files. No access control check exists!

🏢 **Vendor**: Getgrav. <br>📦 **Product**: GravCMS. <br>📅 **Affected Version**: Specifically **1.10.7**. <br>⚠️ **Scope**: Any instance running this specific vulnerable version.

👑 **Privileges**: Full **System Control**. <br>📂 **Data**: Complete **Confidentiality, Integrity, and Availability** loss (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).…

🔓 **Auth Required**: **NONE** (Unauthenticated). <br>🌐 **Network**: Remote (Network Vector). <br>🎯 **Complexity**: **Low** (AC:L). <br>👤 **User Interaction**: **None** (UI:N). <br>📉 **Threshold**: Extremely Low!…

💣 **Public Exploit**: **YES**. <br>📜 **Source**: ExploitDB **49973**. <br>🌐 **Advisory**: VulnCheck Advisory available. <br>⚠️ **Status**: Wild exploitation is possible using public PoCs.

🔍 **Self-Check**: Scan for GravCMS instances. <br>🧪 **Test**: Attempt unauthenticated write access to YAML config files.…

🛠️ **Official Fix**: Update to a patched version of GravCMS. <br>📢 **Source**: Check **getgrav.org** for the latest secure release. <br>🔄 **Action**: Immediate upgrade is the primary mitigation strategy.

🚧 **No Patch Workaround**: <br>1. 🚫 **Block Access**: Restrict access to the scheduler endpoint via WAF or firewall. <br>2. 🔒 **Permissions**: Ensure web server user cannot write to config directories (if possible).…

🔥 **Urgency**: **CRITICAL** (CVSS High). <br>⚡ **Priority**: **IMMEDIATE ACTION REQUIRED**. <br>🚨 **Reason**: Unauthenticated RCE with public exploits. <br>📢 **Recommendation**: Patch immediately or isolate the server!