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THREATINT
PUBLISHED

CVE-2021-43172

Infinite length chain of RRDP repositories



AssignerNLnet Labs
Reserved2021-11-01
Published2021-11-09
Updated2024-09-16

Description

NLnet 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.

Product status

Any version
affected

Credits

We would like to thank Koen van Hove for the discovery.

References

https://www.nlnetlabs.nl/downloads/routinator/CVE-2021-43172_CVE-2021-43173_CVE-2021-43174.txt

cve.org CVE-2021-43172

nvd.nist.gov CVE-2021-43172

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