CVE-2017-3224 Denial of service in Protocol
Attackers can craft OSPF LSAs to corrupt routing tables, causing denial of service or traffic rerouting in Quagga and downstream implementations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2017-3224?
CVE-2017-3224 is a high-severity denial of service vulnerability in Suse Suse Linux, published on 24 Jul 2018. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Open Shortest Path First (OSPF) protocol implementations may improperly determine Link State Advertisement (LSA) recency for LSAs with MaxSequenceNumber. According to RFC 2328 section 13.1, for two instances of the same LSA, recency is determined by first comparing sequence numbers, then checksums, and finally MaxAge. In a case where the sequence numbers are the same, the LSA with the larger checksum is considered more recent, and will not be flushed from the Link State Database (LSDB). Since the RFC does not explicitly state that the values of links carried by a LSA must be the same when prematurely aging a self-originating LSA with MaxSequenceNumber, it is possible in vulnerable OSPF implementations for an attacker to craft a LSA with MaxSequenceNumber and invalid links that will result in a larger checksum and thus a 'newer' LSA that will not be flushed from the LSDB. Propagation of the crafted LSA can result in the erasure or alteration of the routing tables of routers within the routing domain, creating a denial of service condition or the re-routing of traffic on the network. CVE-2017-3224 has been reserved for Quagga and downstream implementations (SUSE, openSUSE, and Red Hat packages).
Which versions are affected by CVE-2017-3224?
It affects 4 products.
Products include Quagga Quagga, Redhat Package Manager, Suse Opensuse, Suse Suse Linux.
How do I fix CVE-2017-3224?
No fix has been published for CVE-2017-3224 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2017-3224 being exploited?
There is no known exploitation of CVE-2017-3224 in the wild and no public exploit code.
Other vulnerabilities in Suse Suse Linux
Sources
Also known as GHSA-63cp-f7wp-c79r, UBUNTU-CVE-2017-3224.