This is a summary of the AI-generated 10-question deep analysis. The full version (longer answers, follow-up Q&A, related CVEs) requires login. Read the full analysis β
Q1What is this vulnerability? (Essence + Consequences)
π¨ **Essence**: VyOS devices use **identical Dropbear SSH private keys** across different installations.β¦
π‘οΈ **CWE**: CWE-321 (Use of Hard-coded Cryptographic Key). <br>π **Flaw**: The system fails to generate unique cryptographic keys per device.β¦
π¦ **Vendor**: VyOS. <br>π **Affected Versions**: **1.3** through **1.5**. <br>β οΈ **Scope**: Any enterprise router running these specific streams is vulnerable.
Q4What can hackers do? (Privileges/Data)
π» **Privileges**: Full SSH access impersonation. <br>π **Data**: Attackers can **eavesdrop** on sensitive network configurations and commands.β¦
π« **Public Exploit**: **None available** (POCs: []). <br>π **Status**: Theoretical risk. No wild exploitation observed yet, but the flaw is fundamental and easy to understand for attackers.
Q7How to self-check? (Features/Scanning)
π **Self-Check**: Scan for **Dropbear SSH** services. <br>π **Verification**: Check if the SSH host key fingerprint matches the **known default VyOS fingerprint**.β¦
β **Fixed**: **Yes**. <br>π₯ **Patch**: Update to **Stream 1.5-2025-Q1** or later. <br>π **Ref**: See [vyos.net/get/stream/#1.5-2025-Q1](https://vyos.net/get/stream/#1.5-2025-Q1) for the fixed build.
Q9What if no patch? (Workaround)
π‘οΈ **Workaround**: If you cannot patch immediately: <br>1. **Regenerate** unique SSH host keys manually on each device. <br>2. Restrict SSH access via **Firewall Rules** to trusted IPs only. <br>3.β¦
π₯ **Priority**: **HIGH**. <br>π¨ **Reason**: CVSS Score is high (C:H, I:H, A:H). Since it affects core infrastructure (routers) and allows MitM, immediate patching to the latest Q1 2025 stream is strongly recommended.