Question 1

What is this vulnerability? (Essence + Consequences)

Accepted Answer

🚨 **Essence**: A critical flaw in the `res_http_websocket.so` module of Asterisk.
💥 **Consequences**: Sending a crafted HTTP request causes the Asterisk system to **crash** (Denial of Service).…

Question 2

Root Cause? (CWE/Flaw)

Accepted Answer

🛠️ **Root Cause**: The vulnerability lies within the **HTTP WebSocket upgrade** handling logic in the `res_http_websocket.so` module.…

Question 3

Who is affected? (Versions/Components)

Accepted Answer

🏢 **Vendor**: Digium (Asterisk & Certified Asterisk).
📦 **Affected Versions**:
• Asterisk **13.23.0** and earlier.
• Asterisk **14.7.x** up to **14.7.7**.…

Question 4

What can hackers do? (Privileges/Data)

Accepted Answer

🎯 **Attacker Action**: Remote crash via crafted HTTP request.
🔓 **Privileges**: **None required** for the crash itself.
📊 **Data Impact**: **Denial of Service** (Service unavailable).…

Question 5

Is exploitation threshold high? (Auth/Config)

Accepted Answer

🔓 **Threshold**: **LOW**.
🌐 **Auth**: Likely **Remote** and **Unauthenticated** (HTTP request based).
⚙️ **Config**: Requires the WebSocket module to be enabled/accessible.

Question 6

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

Accepted Answer

📢 **Public Exp?**: Yes.
📜 **Evidence**: References include **Full Disclosure mailing list** (20180920) and **Debian LTS** security updates. This indicates public awareness and potential PoC availability.

Question 7

How to self-check? (Features/Scanning)

Accepted Answer

🔍 **Self-Check**:
1. Check Asterisk version (`asterisk -rv`).
2. Verify if version is ≤ 13.23.0 or ≤ 14.7.7.
3. Scan for open WebSocket ports (usually 80/443/8088) and test HTTP upgrade headers.

Question 8

Is it fixed officially? (Patch/Mitigation)

Accepted Answer

🛡️ **Fixed?**: **YES**.
📥 **Patch**: Updates are available via **Debian DSA-4320** and **Asterisk JIRA ASTERISK-28013**. Upgrade to patched versions immediately.

Question 9

What if no patch? (Workaround)

Accepted Answer

🚧 **No Patch Workaround**:
1. **Block** external access to WebSocket ports (firewall rules).
2. **Disable** the `res_http_websocket.so` module if not needed.
3. Restrict HTTP access to trusted IPs only.

Question 10

Is it urgent? (Priority Suggestion)

Accepted Answer

🔥 **Urgency**: **HIGH**.
⚡ **Reason**: Remote crash capability with low exploitation threshold. Critical for PBX systems handling voice calls. Patch immediately to prevent service disruption.

Goal Reached Thanks to every supporter — we hit 100%!

CVE-2018-17281 — 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)

Continue exploring