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CVE-2022-41720

7.5 · HIGH

On Windows, restricted files can be accessed via os.DirFS and http.Dir.

Published Dec 7, 2022CWE-22EPSS 1.28%

Overview

CVE-2022-41720 is a high-severity vulnerability. It was published on December 7, 2022 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

On Windows, restricted files can be accessed via os.DirFS and http.Dir. The os.DirFS function and http.Dir type provide access to a tree of files rooted at a given directory. These functions permit access to Windows device files under that root. For example, os.DirFS("C:/tmp").Open("COM1") opens the COM1 device. Both os.DirFS and http.Dir only provide read-only filesystem access. In addition, on Windows, an os.DirFS for the directory (the root of the current drive) can permit a maliciously crafted path to escape from the drive and access any path on the system. With fix applied, the behavior of os.DirFS("") has changed. Previously, an empty root was treated equivalently to "/", so os.DirFS("").Open("tmp") would open the path "/tmp". This now returns an error.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgo.dev/cl/455716Refgo.dev/issue/56694Refgroups.google.com/g/golang-announce/c/L_3rmdT0BMU/m/yZDrXjIiBQAJRefpkg.go.dev/vuln/GO-2022-1143Refgo.dev/cl/455716Refgo.dev/issue/56694Refgroups.google.com/g/golang-announce/c/L_3rmdT0BMU/m/yZDrXjIiBQAJRefpkg.go.dev/vuln/GO-2022-1143

How CyberStrike helps

Frequently asked questions

What is CVE-2022-41720?

CVE-2022-41720 is a high-severity vulnerability. It was published on December 7, 2022 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2022-41720?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2022-41720?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-41720?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-41720 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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