CVE-2021-3909: Infinite open connection causes OctoRPKI to hang forever
First published: Mon Nov 01 2021(Updated: )
OctoRPKI (github.com/cloudflare/cfrpki/cmd/octorpki) does not limit the length of a connection, allowing for a slowloris DOS attack to take place which makes OctoRPKI wait forever. Specifically, the repository that OctoRPKI sends HTTP requests to will keep the connection open for a day before a response is returned, but does keep drip feeding new bytes to keep the connection alive. ## Patches ## For more information If you have any questions or comments about this advisory email us at security@cloudflare.com
Credit: cna@cloudflare.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| go/github.com/cloudflare/cfrpki | <1.4.0 | 1.4.0 |
| Cloudflare Octorpki | <1.3.0 | |
| 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 |
Remedy
Upgrade to 1.4
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Reference Links
- https://github.com/cloudflare/cfrpki/security/advisories/GHSA-8cvr-4rrf-f244
- https://nvd.nist.gov/vuln/detail/CVE-2021-3909
- https://github.com/cloudflare/cfrpki/releases/tag/v1.4.0
- https://www.debian.org/security/2021/dsa-5033
- https://www.debian.org/security/2022/dsa-5041
- https://github.com/advisories/GHSA-8cvr-4rrf-f244 (Advisory)
- https://security-tracker.debian.org/tracker/CVE-2021-3909
Frequently Asked Questions
What is CVE-2021-3909?
CVE-2021-3909 is a vulnerability in OctoRPKI that allows for a slowloris DOS attack.
How does CVE-2021-3909 impact OctoRPKI?
CVE-2021-3909 allows an attacker to perform a slowloris DOS attack on OctoRPKI, causing it to wait forever.
What is the severity of CVE-2021-3909?
CVE-2021-3909 has a severity rating of high (7.5).
Which software versions are affected by CVE-2021-3909?
The affected software versions include OctoRPKI 1.3.0 up to, but not including, 1.4.0, cfrpki 1.4.0, 1.4.2-1~deb11u1, 1.4.4-1, 1.5.10-2, fort-validator 1.5.3-1~deb11u1, 1.5.4-1, and rpki-client 8.2-2, 8.6-1.
How can CVE-2021-3909 be fixed?
To fix CVE-2021-3909, update OctoRPKI to version 1.4.0 or later, cfrpki to version 1.4.0, 1.4.2-1~deb11u1, 1.4.4-1, or 1.5.10-2, fort-validator to version 1.5.3-1~deb11u1 or 1.5.4-1, and rpki-client to version 8.2-2 or 8.6-1.
- collector/github-advisory-latest
- alias/GHSA-8cvr-4rrf-f244
- alias/CVE-2021-3909
- collector/github-advisory
- collector/nvd-index
- collector/security-tracker-debian
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- agent/tags
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/event
- agent/trending
- package-manager/go
- vendor/cloudflare
- canonical/cloudflare octorpki
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/11.0
- package-manager/debian