CVE-2021-43172

NameCVE-2021-43172
DescriptionNLnet Labs Routinator prior to 0.10.2 happily processes a chain of RRDP repositories of infinite length causing it to never finish a validation run. In RPKI, a CA can choose the RRDP repository it wishes to publish its data in. By continuously generating a new child CA that only consists of another CA using a different RRDP repository, a malicious CA can create a chain of CAs of de-facto infinite length. Routinator prior to version 0.10.2 did not contain a limit on the length of such a chain and will therefore continue to process this chain forever. As a result, the validation run will never finish, leading to Routinator continuing to serve the old data set or, if in the initial validation run directly after starting, never serve any data at all.
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)
Debian Bugs929024

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
cfrpki (PTS)bullseye (security), bullseye1.4.2-1~deb11u1vulnerable
bookworm, sid1.4.3-1vulnerable
fort-validator (PTS)bullseye (security), bullseye1.5.3-1~deb11u1vulnerable
bookworm, sid1.5.3-1vulnerable
rpki-client (PTS)bullseye6.8p1-2vulnerable
bookworm, sid7.8-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
cfrpkisource(unstable)(unfixed)
fort-validatorsource(unstable)(unfixed)
routinatorITP929024
rpki-clientsource(unstable)7.5-1

Notes

[bullseye] - fort-validator <postponed> (Minor issue, revisit when fixed upstream)
[bullseye] - cfrpki <postponed> (Minor issue, revisit when fixed upstream)
https://www.nlnetlabs.nl/downloads/routinator/CVE-2021-43172_CVE-2021-43173_CVE-2021-43174.txt
https://github.com/NLnetLabs/routinator/pull/665

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