CVE-2020-12641 — AI Deep Analysis Summary

🚨 **Essence**: A Command Injection flaw in `rcube_image.php`. 📉 **Consequences**: Attackers can execute arbitrary OS commands via shell metacharacters. 💥 **Impact**: Full system compromise if triggered.

🛡️ **Root Cause**: Lack of input sanitization in the `_im_convert_path` parameter. 🐛 **Flaw**: Unsafe handling of image conversion paths allows shell injection. 📝 **CWE**: Implicitly Command Injection (CWE-78).

📦 **Affected**: Roundcube Webmail versions **< 1.4.4**, **< 1.3.11**, and **< 1.2.10**. 🌐 **Component**: Specifically the `rcube_image.php` file. ⚠️ **Note**: Bypass exists for versions < 1.4.5/1.3.12.

💻 **Privileges**: Arbitrary code execution on the server. 📂 **Data**: Potential access to all server data/files. 🔄 **Action**: Can run any system command via image processing triggers.

🔑 **Threshold**: **High** for initial access. 🛑 **Requirement**: Attacker needs access to the **Roundcube Installer** to inject the malicious `_im_convert_path`.…

🔓 **Public Exp**: **Yes**. 📂 **PoC**: Available on GitHub (e.g., `mbadanoiu/CVE-2020-12641`). 🚀 **Automation**: Nuclei templates exist for scanning. ⚠️ **Bypass**: MAL-004 shows how to bypass initial fixes.

🔍 **Check**: Scan for Roundcube versions < 1.4.4. 📡 **Tool**: Use Nuclei templates (`CVE-2020-12641.yaml`). 🧪 **Test**: Verify if `_im_convert_path` is unsanitized in installer config.

🩹 **Fixed**: **Yes**. 📅 **Date**: April 29, 2020. 📦 **Patch**: Upgrade to **1.4.4+**, **1.3.11+**, or **1.2.10+**. 🔄 **Warning**: Initial fix was bypassable; ensure latest patch is applied.

🚧 **Workaround**: Restrict access to the Roundcube Installer. 🛑 **Mitigation**: Disable image conversion features if possible. 🔒 **Config**: Ensure `_im_convert_path` is strictly validated/sanitized.

⚡ **Urgency**: **High**. 📉 **Risk**: Remote Code Execution (RCE). 🚨 **Action**: Patch immediately if using vulnerable versions. 📢 **Note**: Public exploits and bypasses exist.