What is the vulnerability ID?

The vulnerability ID is CVE-2021-43172.

What is the severity of CVE-2021-43172?

The severity of CVE-2021-43172 is high with a CVSS score of 7.5.

What software is affected by CVE-2021-43172?

NLnet Labs Routinator prior to version 0.10.2 is affected by CVE-2021-43172.

How can the vulnerability be exploited?

The vulnerability can be exploited by causing Routinator to process a chain of RRDP repositories of infinite length, preventing a validation run from finishing.

Is there a fix available for CVE-2021-43172?

Yes, the fix for CVE-2021-43172 is to upgrade Routinator to version 0.10.2 or later.

Vulnerability/
CVE-2021-43172

high

7.5

CWE

835 674

9/11/2021

16/9/2024

CVE-2021-43172: Infinite length chain of RRDP repositories

First published: Tue Nov 09 2021(Updated: )

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.

Credit: sep@nlnetlabs.nl

Affected Software	Affected Version	How to fix
Nlnetlabs Routinator	<0.10.2

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Reference Links

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

Frequently Asked Questions

What is the vulnerability ID?
The vulnerability ID is CVE-2021-43172.
What is the severity of CVE-2021-43172?
The severity of CVE-2021-43172 is high with a CVSS score of 7.5.
What software is affected by CVE-2021-43172?
NLnet Labs Routinator prior to version 0.10.2 is affected by CVE-2021-43172.
How can the vulnerability be exploited?
The vulnerability can be exploited by causing Routinator to process a chain of RRDP repositories of infinite length, preventing a validation run from finishing.
Is there a fix available for CVE-2021-43172?
Yes, the fix for CVE-2021-43172 is to upgrade Routinator to version 0.10.2 or later.

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