CVE-2017-3224

NameCVE-2017-3224
DescriptionOpen 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).
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium (attack range: remote)
Debian Bugs871617

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
quagga (PTS)jessie (security), jessie0.99.23.1-1+deb8u5vulnerable
stretch (security), stretch1.1.1-3+deb9u2vulnerable
buster, sid1.2.4-2vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
quaggasource(unstable)(unfixed)low871617

Notes

[stretch] - quagga <no-dsa> (Minor issue)
[jessie] - quagga <no-dsa> (Minor issue)
[wheezy] - quagga <no-dsa> (Minor issue)
http://www.kb.cert.org/vuls/id/793496

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