OctoRPKI lacks contextual out-of-bounds check when validating RPKI ROA maxLength values
CVE-2021-3761

7.5HIGH

Key Information:

Vendor

Cloudflare

Status
Octorpki
Vendor
CVE Published:
3 September 2021

What is CVE-2021-3761?

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.

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Affected Version(s)

octorpki < 1.3.0

References

https://github.com/cloudflare/cfrpki/security/advisories/...
x_refsource_MISC
https://www.debian.org/security/2022/dsa-5041
vendor-advisoryx_refsource_DEBIAN

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Job Snijders
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