CVE-2021-3761

NameCVE-2021-3761
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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium
Debian Bugs994572

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
cfrpki (PTS)bookworm, bullseye1.2.2-1vulnerable
sid1.3.0-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
cfrpkisource(unstable)1.3.0-1994572

Notes

https://github.com/cloudflare/cfrpki/security/advisories/GHSA-c8xp-8mf3-62h9
https://github.com/cloudflare/cfrpki/commit/a8db4e009ef217484598ba1fd1c595b54e0f6422

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