CVE-2021-3907 Arbitrary filepath traversal via URI injection

What is CVE-2021-3907?

CVE-2021-3907 is a high-severity path traversal vulnerability in Debian Debian Linux, published on 11 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

OctoRPKI does not escape a URI with a filename containing "..", this allows a repository to create a file, (ex. rsync://example.org/repo/../../etc/cron.daily/evil.roa), which would then be written to disk outside the base cache folder. This could allow for remote code execution on the host machine OctoRPKI is running on.

Weakness: CWE-22, CWE-20

Which versions are affected by CVE-2021-3907?

5 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-2021-3907?

Upgrade github.com/cloudflare/cfrpki to a fixed version for your release line: 1.4.3 or 1.4.4.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2021-3907 being exploited?

There is no known exploitation of CVE-2021-3907 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-2021-3908 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
• CVE-2021-3909 Infinite open connection causes OctoRPKI to hang forever Medium 4.4

All Debian Debian Linux vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2021-3907, GHSA-8459-6rc9-8vf8, GHSA-cqh2-vc2f-q4fh, GO-2022-0248, UBUNTU-CVE-2021-3907.