CVE-2021-3761

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Summary

CVECVE-2021-3761
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-09-09 14:15:00 UTC
Updated2022-04-04 13:41:00 UTC
DescriptionAny 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.

Risk And Classification

Problem Types: CWE-787

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Cloudflare Octorpki All All All All
Operating System Debian Debian Linux 11.0 All All All

References

ReferenceSourceLinkTags
Debian -- Security Information -- DSA-5041-1 cfrpki DEBIAN www.debian.org
OctoRPKI lacks contextual out-of-bounds check when validating RPKI ROA maxLength values · Advisory · cloudflare/cfrpki · GitHub CONFIRM github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

LEGACY: Job Snijders

Legacy QID Mappings

  • 178993 Debian Security Update for cfrpki (DSA 5041-1)
  • 183149 Debian Security Update for cfrpki (CVE-2021-3761)
  • 980654 Go (go) Security Update for github.com/cloudflare/cfrpki (GHSA-c8xp-8mf3-62h9)
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