Vulnerability Description
Any CA issuer in the RPKI can trick OctoRPKI prior to 1.3.0 into emitting an invalid VRP "MaxLength" value, causing RTR sessions to terminate. An attacker can use this to disable RPKI Origin Validation in a victim network (for example AS 13335 - Cloudflare) prior to launching a BGP hijack which during normal operations would be rejected as "RPKI invalid". Additionally, in certain deployments RTR session flapping in and of itself also could cause BGP routing churn, causing availability issues.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cloudflare | Octorpki | < 1.3.0 |
| Debian | Debian Linux | 11.0 |
Related Weaknesses (CWE)
References
- https://github.com/cloudflare/cfrpki/security/advisories/GHSA-c8xp-8mf3-62h9PatchThird Party Advisory
- https://www.debian.org/security/2022/dsa-5041Third Party Advisory
- https://github.com/cloudflare/cfrpki/security/advisories/GHSA-c8xp-8mf3-62h9PatchThird Party Advisory
- https://www.debian.org/security/2022/dsa-5041Third Party Advisory
FAQ
What is CVE-2021-3761?
CVE-2021-3761 is a vulnerability with a CVSS score of 7.5 (HIGH). Any CA issuer in the RPKI can trick OctoRPKI prior to 1.3.0 into emitting an invalid VRP "MaxLength" value, causing RTR sessions to terminate. An attacker can use this to disable RPKI Origin Validatio...
How severe is CVE-2021-3761?
CVE-2021-3761 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-3761?
Check the references section above for vendor advisories and patch information. Affected products include: Cloudflare Octorpki, Debian Debian Linux.