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Q1What is this vulnerability? (Essence + Consequences)
🚨 **Essence**: A **Code Injection** flaw in Microsoft Exchange Server. 📧 **Consequences**: Attackers can inject malicious code, potentially leading to **data breaches** or **system compromise**.…
🛡️ **Root Cause**: The provided data lists **CWE ID as null**. However, the PoC description reveals a **Cross-Site Scripting (XSS)** vulnerability in the `refurl` parameter of `frowny.asp`.…
💣 **Public Exploit**: **Yes**. A PoC is available via **Nuclei Templates** on GitHub. 🔗 Link: `projectdiscovery/nuclei-templates`. This means automated scanning tools can detect and potentially exploit this easily.
Q7How to self-check? (Features/Scanning)
🔍 **Self-Check**:
- Use **Nuclei** with the specific CVE template.
- Check for the presence of `frowny.asp` and the `refurl` parameter.
- Scan for XSS payloads in the `refurl` input field. 🕵️♂️
Q8Is it fixed officially? (Patch/Mitigation)
🩹 **Official Fix**: **Yes**. Microsoft published the advisory on **2021-05-11**. 📅 Organizations should apply the latest Cumulative Updates or security patches provided by Microsoft to resolve this.
Q9What if no patch? (Workaround)
🚧 **No Patch?**:
- **Mitigation**: Block external access to `frowny.asp` via WAF rules.
- **Filtering**: Sanitize the `refurl` parameter to prevent XSS injection.…