CVE-2016-1245

What it actually does

Stack-based buffer overflow in the zebra daemon when handling IPv6 Neighbor Discovery messages caused by assuming BUFSIZ matches message size, enabling memory corruption.

Why it matters to the business

Attackers could crash routing services or execute code to disrupt network operations, with urgency for any unpatched Quagga deployments given the flaw's age and remote reach.

How an attack unfolds

An unauthenticated remote attacker sends a crafted IPv6 Neighbor Discovery message exceeding expected size; the daemon copies data into a fixed stack buffer sized by BUFSIZ, corrupting memory and allowing control-flow hijacking or denial of service.

How to fix it

Upgrade Quagga to version containing commit cfb1fae25f8c092e0d17073eaf7bd428ce1cd546 or later release 1.0.20161017; apply equivalent fixed packages for any dependent products such as kubernetes-dashboard-metrics-scraper-fips at 1.0.9-r2.

How to confirm the fix worked

Verify installed Quagga version against fixed commit or release; perform packet fuzzing with oversized IPv6 ND messages in a lab environment to confirm absence of overflow.

Typical attack path

1. Locate exposed Quagga zebra daemon accepting IPv6 traffic
2. Craft oversized IPv6 Neighbor Discovery message
3. Send packet to trigger stack overflow
4. Achieve code execution or service crash

How to detect it

Review zebra daemon logs and system crash dumps for buffer overflow indicators; inspect network captures for unusually large or malformed IPv6 Neighbor Discovery packets targeting routing ports.

What your security team should do

• Apply the listed fixed versions immediately on all affected systems
• Restrict IPv6 access to zebra daemon to trusted sources only
• Monitor network traffic for anomalous IPv6 Neighbor Discovery patterns