Vulnerability identifier: #VU63862

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3907

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
cfrpki
Server applications / Other server solutions

Vendor: Cloudflare

Description

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to OctoRPKI does not escape a URI with a filename containing "..". A remote attacker can send a specially crafted HTTP request and execute arbitrary code on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

cfrpki: 1.0.0 - 1.3.0

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External links
http://github.com/cloudflare/cfrpki/security/advisories/GHSA-cqh2-vc2f-q4fh
http://www.debian.org/security/2021/dsa-5033
http://www.debian.org/security/2022/dsa-5041

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.