Go 1.19.4 のリリース【セキュリティ・アップデート】

The os.DirFS function and http.Dir type provide access to a tree of files rooted at a given directory. These functions permitted access to Windows device files under that root. For example, os.DirFS("C:/tmp").Open("COM1") would open 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.

An attacker can cause excessive memory growth in a Go server accepting HTTP/2 requests.

HTTP/2 server connections contain a cache of HTTP header keys sent by the client. While the total number of entries in this cache is capped, an attacker sending very large keys can cause the server to allocate approximately 64 MiB per open connection.

This issue is also fixed in golang.org/x/net/http2 vX.Y.Z, for users manually configuring HTTP/2.

The os.DirFS function and http.Dir type provide access to a tree of files rooted at a given directory. These functions permitted access to Windows device files under that root. For example, os.DirFS("C:/tmp").Open("COM1") would open 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.