CVE-2021-3910 NUL character in ROA causes OctoRPKI to crash

What is CVE-2021-3910?

CVE-2021-3910 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 11 Nov 2021. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

OctoRPKI crashes when encountering a repository that returns an invalid ROA (just an encoded NUL (\0) character).

Weakness: CWE-20

Which versions are affected by CVE-2021-3910?

3 open source packages ship an affected version, including github.com/cloudflare/cfrpki. It affects 2 products.

Products include Cloudflare Octorpki, Debian Debian Linux.

How do I fix CVE-2021-3910?

Upgrade github.com/cloudflare/cfrpki to 1.4.0 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-3910 being exploited?

There is no known exploitation of CVE-2021-3910 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2021-3978 Improper Preservation of Permissions in github.com/cloudflare/cfrpki/cmd/octorpki High 7.5
• CVE-2021-3761 OctoRPKI lacks contextual out-of-bounds check when validating RPKI ROA maxLength values High 7.5
• CVE-2021-3907 Arbitrary filepath traversal via URI injection High 7.4
• CVE-2021-3908 Infinite certificate chain depth results in OctoRPKI running forever Medium 5.9
• CVE-2022-3616 OctoRPKI crash when maximum iterations number is reached Medium 5.4

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2021-3910, GHSA-5mxh-2qfv-4g7j, GO-2022-0251.