CVE-2020-9015 — AI Deep Analysis Summary

🚨 **Essence**: A shell escape flaw in Arista EOS. Attackers use the `|` character to bypass TACACS+ restrictions. 📉 **Consequences**: Privilege escalation from restricted shell to full system access.

🛡️ **Root Cause**: Improper input validation in the restricted shell implementation. It fails to sanitize the pipe character (`|`), allowing command injection.…

📦 **Affected Products**: Arista Networks switches. 📅 **Versions**: DCS-7050QX-32S-R (v4.20.9M), DCS-7050CX3-32S-R (v4.20.11M), DCS-7280SRAM-48C6-R (v4.22.0.1F).

💀 **Attacker Action**: Bypasses TACACS+ shell limits. 🗝️ **Privileges**: Escalates from restricted user to **full administrative/root privileges**. 📂 **Data**: Full access to network device configuration and commands.

🔐 **Threshold**: Medium. Requires access to the restricted shell interface. ⚙️ **Config**: Depends on TACACS+ configuration. If restricted shell is enabled, this bypass is possible.

🌐 **Public Exp?**: Yes. References link to PacketStorm and SecurityBytes. 📝 **PoC**: Available online demonstrating the `|` character bypass technique.

🔍 **Self-Check**: Scan for Arista EOS versions listed above. 🧪 **Test**: Check if TACACS+ restricted shell is active. Attempt to inject `|` in shell commands (only in authorized test envs!).

🩹 **Official Fix**: Arista published a statement (eos.arista.com) regarding vulnerability status. ⚠️ **Note**: Check vendor site for specific patch versions, as the CVE page links to a denial/statement.

🚧 **No Patch?**: Disable TACACS+ restricted shell if possible. 🛑 **Mitigation**: Restrict network access to management interfaces. Monitor for unauthorized command execution.

🔥 **Urgency**: HIGH. 🔑 **Priority**: Critical for network admins. This allows easy privilege escalation. Patch immediately or apply strict access controls.