Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Golang | Go | < 1.18.9 |
| Microsoft | Windows | - |
Related Weaknesses (CWE)
References
- https://go.dev/cl/455716PatchVendor Advisory
- https://go.dev/issue/56694Issue TrackingVendor Advisory
- https://groups.google.com/g/golang-announce/c/L_3rmdT0BMU/m/yZDrXjIiBQAJPatchRelease NotesThird Party Advisory
- https://pkg.go.dev/vuln/GO-2022-1143PatchVendor Advisory
- https://go.dev/cl/455716PatchVendor Advisory
- https://go.dev/issue/56694Issue TrackingVendor Advisory
- https://groups.google.com/g/golang-announce/c/L_3rmdT0BMU/m/yZDrXjIiBQAJPatchRelease NotesThird Party Advisory
- https://pkg.go.dev/vuln/GO-2022-1143PatchVendor Advisory
FAQ
What is CVE-2022-41720?
CVE-2022-41720 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ac...
How severe is CVE-2022-41720?
CVE-2022-41720 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-41720?
Check the references section above for vendor advisories and patch information. Affected products include: Golang Go, Microsoft Windows.