CVE-2017-3224

A vulnerability was discovered in several OSPF implementations, including Quagga. A malicious OSPF peer, or an attacker able to spoof messages from an OSPF peer, could send a crafted message that would result in erasure or alteration of the routing table, resulting in denial of service or incorrect routing of traffic.

For an attacker to exploit this vulnerability, they would either need to control an OSPF peer or spoof a message into the routing domain that appears to come from an OSPF peer. The OSPF trust model is not considered robust against malicious or compromised peers influencing the routing table. Message spoofing is effectively prevented by requiring authentication.

Red Hat Product Security has rated this issue as having Moderate security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

It is strongly recommended to configure Quagga to require authentication from OSPF peers (eg ip ospf authentication message-digest ). Message digest authentication effectively prevents even a man-in-the-middle attacker from exploiting this vulnerability or otherwise interfering with the routing table, as any message without a proper cryptographic signature will be rejected.