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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2021-3761)

The remote Debian 11 host has a package installed that is affected by multiple vulnerabilities as referenced in the dsa-5041 advisory.

    Multiple vulnerabilities were discovered in Cloudflare's RPKI validator, which could result in denial of     service or path traversal. For the stable distribution (bullseye), these problems have been fixed in     version 1.4.2-1~deb11u1. We recommend that you upgrade your cfrpki packages. For the detailed security     status of cfrpki please refer to its security tracker page at: https://security-     tracker.debian.org/tracker/cfrpki

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
413785	SCA: security update for github.com/cloudflare/cfrpki (GHSA-c8xp-8mf3-62h9)	Tenable Cloud Security	SCA Checks	high
413785	SCA: security update for github.com/cloudflare/cfrpki (GHSA-c8xp-8mf3-62h9)	Tenable Self-Hosted Container Security	SCA Checks	high
156636	Debian DSA-5041-1 : cfrpki - security update	Nessus	Debian Local Security Checks	critical

Detections

Analytics

CVE-2021-3761

high

Tenable Plugins

high

high

critical