CVE-2021-43173: Hanging RRDP request
First published: Tue Nov 09 2021(Updated: )
In 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.
Credit: sep@nlnetlabs.nl
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Nlnetlabs Routinator | <0.10.2 | |
| Debian Debian Linux | =11.0 | |
| debian/cfrpki | 1.4.2-1~deb11u1 1.4.4-1 1.5.10-2 | |
| debian/fort-validator | 1.5.3-1~deb11u1 1.5.4-1 1.6.1-1 | |
| debian/rpki-client | <=6.8p1-2 | 8.2-2 8.7-1 |
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Reference Links
- https://www.debian.org/security/2021/dsa-5033
- https://www.debian.org/security/2022/dsa-5041
- 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
- https://security-tracker.debian.org/tracker/CVE-2021-43173
Frequently Asked Questions
What is the vulnerability ID for this vulnerability?
The vulnerability ID for this vulnerability is CVE-2021-43173.
What is the severity rating of CVE-2021-43173?
CVE-2021-43173 has a severity rating of 7.5, which is considered high.
How can I exploit CVE-2021-43173?
To exploit CVE-2021-43173, an attacker can delay a validation run by slowly drip-feeding bytes to keep the connection alive, effectively stalling the validation.
Which software versions are affected by CVE-2021-43173?
The affected software versions include Routinator prior to 0.10.2 and Debian Debian Linux 11.0.
Where can I find more information about CVE-2021-43173?
You can find more information about CVE-2021-43173 on the Debian Security Advisory DSA-5033 and DSA-5041, as well as the NLnet Labs Routinator downloads page.
- collector/nvd-index
- collector/security-tracker-debian
- agent/weakness
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/references
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- vendor/nlnetlabs
- canonical/nlnetlabs routinator
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- version/debian debian linux/11.0
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