Date: Fri, 29 Jan 1999 08:41:35 -0500 From: Steve Bellovin <smb@RESEARCH.ATT.COM> Subject: Re: UNIX shell modem access vulnerabilities To: BUGTRAQ@NETSPACE.ORG Problems with tty access not being revoked are not new -- they've occurred for at least 20 years. Circa 1988, I devised a strong solution; however, I was unable to get it into System V in that form. Today, with the advent of several different free UNIX-like systems, it may be worth revisiting the question. See http://www.research.att.com/~smb/papers/sessext.ps (or .pdf) for a description of my work. (Btw -- while I can't guarantee that there are no patent claims lurking around, I did not file anything, and I don't know of anyone else who might claim something.)