Question 1

What is this vulnerability? (Essence + Consequences)

Accepted Answer

🚨 **Essence**: A critical OS Command Injection flaw in Zeroshell.
💥 **Consequences**: Attackers can execute arbitrary system commands remotely.…

Question 2

Root Cause? (CWE/Flaw)

Accepted Answer

🛡️ **Root Cause**: Improper input validation in the `cgi-bin/kerbynet` module.…

Question 3

Who is affected? (Versions/Components)

Accepted Answer

📦 **Affected**: Zeroshell Linux distribution.
📌 **Version**: Specifically **3.9.3**.
🌐 **Context**: Used in servers and embedded systems (often routers).

Question 4

What can hackers do? (Privileges/Data)

Accepted Answer

💀 **Privileges**: **Unauthenticated** access. No login required.
📂 **Data**: Full system command execution.…

Question 5

Is exploitation threshold high? (Auth/Config)

Accepted Answer

⚡ **Threshold**: **LOW**.
🔓 **Auth**: None needed.
⚙️ **Config**: Exploitable via standard HTTP requests to the CGI endpoint. Highly accessible.

Question 6

Is there a public Exp? (PoC/Wild Exploitation)

Accepted Answer

🔓 **Public Exp?**: **YES**.
📜 **PoC**: Available via Nuclei templates (ProjectDiscovery).
🌍 **Wild Exp**: High risk due to simplicity and lack of auth.

Question 7

How to self-check? (Features/Scanning)

Accepted Answer

🔍 **Self-Check**: Scan for `/cgi-bin/kerbynet` endpoint.
🧪 **Test**: Send payload with shell metacharacters (`;`, `|`) and `%0a` in `StartSessionSubmit`. Check for command output in response.

Question 8

Is it fixed officially? (Patch/Mitigation)

Accepted Answer

🩹 **Fix**: Update Zeroshell to a patched version (if available from vendor).
📝 **Note**: Vendor info marked 'n/a' in data, so check official Zeroshell channels for specific patch releases post-2020-11-30.

Question 9

What if no patch? (Workaround)

Accepted Answer

🚧 **Workaround**:
1. **Block Access**: Restrict access to `/cgi-bin/kerbynet` via firewall/WAF.
2.…

Question 10

Is it urgent? (Priority Suggestion)

Accepted Answer

🔥 **Urgency**: **CRITICAL**.
⏱️ **Priority**: Immediate action required. Unauthenticated RCE is a top-tier threat. Patch or isolate affected devices NOW.

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CVE-2020-29390 — AI Deep Analysis Summary

Q1What is this vulnerability? (Essence + Consequences)

Q2Root Cause? (CWE/Flaw)

Q3Who is affected? (Versions/Components)

Q4What can hackers do? (Privileges/Data)

Q5Is exploitation threshold high? (Auth/Config)

Q6Is there a public Exp? (PoC/Wild Exploitation)

Q7How to self-check? (Features/Scanning)

Q8Is it fixed officially? (Patch/Mitigation)

Q9What if no patch? (Workaround)

Q10Is it urgent? (Priority Suggestion)

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