CVE-2023-46565

What it actually does

A remote attacker can trigger a buffer overflow in the handlingError function by sending specially crafted input, resulting in a denial of service.

Why it matters to the business

Disrupts BGP routing services, potentially causing network instability and downtime for organizations relying on this software.

How an attack unfolds

An attacker sends malicious network packets to the gobgp server, exploiting the buffer overflow in the FSM error handling logic to crash the process.

How to fix it

Update to a patched version of gobgp that addresses the buffer overflow in pkg/server/fsm.go.

How to confirm the fix worked

Verify the software version and test the handlingError function with known inputs or monitor for crashes.

Typical attack path

1. Identify exposed gobgp instance
2. Craft and send malicious BGP messages
3. Trigger handlingError function
4. Cause buffer overflow leading to crash

How to detect it

Look for crashes or error logs in gobgp related to handlingError, unusual network connections to the BGP port.

What your security team should do

• Apply available patches promptly
• Monitor network traffic for anomalous BGP packets
• Implement network segmentation to limit exposure