CVE-2022-0563

A flaw was found in the util-linux chfn and chsh utilities when compiled with Readline support. The Readline library uses an "INPUTRC" environment variable to get a path to the library config file. When the library cannot parse the specified file, it prints an error message containing data from the file. This flaw allows an unprivileged user to read root-owned files, potentially leading to privilege escalation. This flaw affects util-linux versions prior to 2.37.4.

• util-linux (unimportant) https://bugzilla.redhat.com/show_bug.cgi?id=2053151 https://lore.kernel.org/util-linux/20220214110609.msiwlm457ngoic6w@ws.net.home/T/#u https://github.com/util-linux/util-linux/commit/faa5a3a83ad0cb5e2c303edbfd8cd823c9d94c17 util-linux in Debian does build with readline support but chfn and chsh are provided by src:shadow and util-linux is configured with --disable-chfn-chsh