CVE-2022-41720
Restricted file access on Windows in os and net/http
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.
How to fix CVE-2022-41720
To remediate CVE-2022-41720, upgrade the affected package to a fixed version below.
- —upgrade to 1.18.9 or later
- —no fix listed
- —upgrade to 1.19.4-1 or later
- —upgrade to 1.18.9 or later
Is CVE-2022-41720 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 1.18.9, >= 1.19.0, < 1.19.4
- from 0
- from 0, < 1.19.4-1
- from 0, < 1.18.9, >= 1.19.0-0, < 1.19.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |