First published: Wed Dec 07 2022(Updated: )
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.
Credit: security@golang.org
Affected Software | Affected Version | How to fix |
---|---|---|
Golang Go | <1.18.9 | |
Golang Go | >=1.19.0<1.19.4 | |
Microsoft Windows |
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The vulnerability ID is CVE-2022-41720.
The severity of CVE-2022-41720 is high with a CVSS score of 7.5.
CVE-2022-41720 impacts Golang Go versions 1.18.9 up to, but excluding, 1.19.4.
CVE-2022-41720 does not directly impact Microsoft Windows.
To mitigate CVE-2022-41720, it is recommended to upgrade Golang Go to a version above 1.19.4.