Emacs 20 does not properly set permissions for a slave PTY device when starting a new subprocess, which allows local users to read or modify communications between Emacs and the subprocess.
read-passwd and other Lisp functions in Emacs 20 do not properly clear the history of recently typed keys, which allows an attacker to read unencrypted passwords.
GNU fingerd 1.37 does not properly drop privileges before accessing user information, which could allow local users to (1) gain root privileges via a malicious program in the .fingerrc file, or (2) read arbitrary files via symbolic links from .plan, .forward, or .project files.