CVE-2021-43173

NameCVE-2021-43173
DescriptionIn NLnet Labs Routinator prior to 0.10.2, a validation run can be delayed significantly by an RRDP repository by not answering but slowly drip-feeding bytes to keep the connection alive. This can be used to effectively stall validation. While Routinator has a configurable time-out value for RRDP connections, this time-out was only applied to individual read or write operations rather than the complete request. Thus, if an RRDP repository sends a little bit of data before that time-out expired, it can continuously extend the time it takes for the request to finish. Since validation will only continue once the update of an RRDP repository has concluded, this delay will cause validation to stall, leading to Routinator continuing to serve the old data set or, if in the initial validation run directly after starting, never serve any data at all.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
ReferencesDSA-5033-1, DSA-5041-1
Debian Bugs929024

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
cfrpki (PTS)bullseye (security), bullseye1.4.2-1~deb11u1fixed
bookworm, sid1.4.4-1fixed
fort-validator (PTS)bullseye (security), bullseye1.5.3-1~deb11u1fixed
bookworm, sid1.5.3-1fixed
rpki-client (PTS)bullseye6.8p1-2vulnerable
bookworm, sid8.0-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
cfrpkisourcebullseye1.4.2-1~deb11u1DSA-5041-1
cfrpkisource(unstable)1.4.0-1
fort-validatorsourcebullseye1.5.3-1~deb11u1DSA-5033-1
fort-validatorsource(unstable)1.5.3-1
routinatorITP929024
rpki-clientsource(unstable)7.5-1

Notes

[bullseye] - rpki-client <ignored> (Fixed versions need more recent libretls)
https://www.nlnetlabs.nl/downloads/routinator/CVE-2021-43172_CVE-2021-43173_CVE-2021-43174.txt
https://github.com/NLnetLabs/routinator/pull/666
https://github.com/NLnetLabs/routinator/pull/612

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