GO-2022-1143

Source
https://pkg.go.dev/vuln/GO-2022-1143
Import Source
https://vuln.go.dev/ID/GO-2022-1143.json
Aliases
Published
2022-12-07T16:08:45Z
Modified
2023-12-06T01:02:37.037677Z
Details

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.

References

Affected packages

Go / stdlib

Package

Name
stdlib

Affected ranges

Type
SEMVER
Events
Introduced
0The exact introduced commit is unknown
Fixed
1.18.9
Introduced
1.19.0-0
Fixed
1.19.4

Ecosystem specific

{
    "imports": [
        {
            "path": "os",
            "symbols": [
                "DirFS",
                "dirFS.Open",
                "dirFS.Stat"
            ],
            "goos": [
                "windows"
            ]
        },
        {
            "path": "net/http",
            "symbols": [
                "Dir.Open",
                "ServeFile",
                "fileHandler.ServeHTTP",
                "fileTransport.RoundTrip"
            ],
            "goos": [
                "windows"
            ]
        }
    ]
}