Vulnerability · Published Nov 9, 2021 · Assigned by NLnet Labs
CVE-2021-43172Infinite length chain of RRDP repositories
High 7.5
In plain English
A high-severity security flaw in Routinator from NLnet Labs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | rpki-client | 7.5-1 | DEBIAN-CVE-2021-43172 |
| Debian:13 | rpki-client | 7.5-1 | DEBIAN-CVE-2021-43172 |
| Debian:14 | rpki-client | 7.5-1 | DEBIAN-CVE-2021-43172 |
| Ubuntu:22.04:LTS | cfrpki | no fix listed | UBUNTU-CVE-2021-43172 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| NLnet Labs | Routinator | unspecified – through 0.10.1 |
Weakness: CWE-674