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CVE-2017-3224

Published: 24 July 2018

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).

Priority

Low

CVSS 3 base score: 8.2

Status

Package Release Status
quagga
Launchpad, Ubuntu, Debian
artful Ignored
(reached end-of-life)
bionic Needed

cosmic Ignored
(reached end-of-life)
disco Ignored
(reached end-of-life)
eoan Ignored
(reached end-of-life)
focal Needed

groovy Ignored
(reached end-of-life)
hirsute Ignored
(reached end-of-life)
impish Needed

jammy Does not exist

precise Does not exist

trusty Does not exist
(trusty was deferred [2018-02-19])
upstream Needed

xenial Needed

zesty Ignored
(reached end-of-life)
Patches:
other: https://github.com/FRRouting/frr/commit/7791d3deab8f4bbee2ccdd98ea596617536bc681

Notes

AuthorNote
mdeslaur
no upstream fix as of 2018-02-19
while upstream do not have a fix as of 2021-11-22, we can
possibly use the fix from frr

References