FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

go -- multiple vulnerabilities

Affected packages
go118 < 1.18.9
go119 < 1.19.4


VuXML ID 6f5192f5-75a7-11ed-83c0-411d43ce7fe4
Discovery 2022-10-20
Entry 2022-12-06

The Go project reports:

os, net/http: avoid escapes from os.DirFS and http.Dir on Windows

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.

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.

net/http: limit canonical header cache by bytes, not entries

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.


CVE Name CVE-2022-41717
CVE Name CVE-2022-41720