CVE-2022-41720
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.20%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 1.20% probability · 66th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-22
- Affected
- golang/go
- Source
- security@golang.org
References
- https://go.dev/cl/455716Patch, Vendor Advisory
- https://go.dev/issue/56694Issue Tracking, Vendor Advisory
- https://groups.google.com/g/golang-announce/c/L_3rmdT0BMU/m/yZDrXjIiBQAJPatch, Release Notes, Third Party Advisory
- https://pkg.go.dev/vuln/GO-2022-1143Patch, Vendor Advisory
- https://go.dev/cl/455716Patch, Vendor Advisory
- https://go.dev/issue/56694Issue Tracking, Vendor Advisory
- https://groups.google.com/g/golang-announce/c/L_3rmdT0BMU/m/yZDrXjIiBQAJPatch, Release Notes, Third Party Advisory
- https://pkg.go.dev/vuln/GO-2022-1143Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.