Date: Tue, 7 Oct 2014 08:45:52 -0700 From: Michal Zalewski <lcamtuf@...edump.cx> To: oss-security <oss-security@...ts.openwall.com> Subject: Re: Thoughts on Shellshock and beyond >> What class of bug is Shellshock? "Weird feature invented in >> pre-Internet era"? How do you conquer this class of bugs? > > There are two bugs: Calling “eval” on untrusted input (a relatively common > issue), and the fact that this particular code path should never have been > exposed to the network at all. The second part is not strictly a bash bug, > even if we addressed that with a change in bash. If this issue had been > discovered when the first CGI-enabled web server was implemented, maybe it > would not have been called a bash bug, but a bug in how CGI used environment > variables. Possibly, but it probably wouldn't have stayed that way for long. Even though the bug was introduced long before the arrival of Apache, I would guess that it had affected Sendmail from day one. In practice, it's usually counterproductive to try to precisely pin the blame; bash is the place where we can fix it more easily and produce more intuitive behavior with one less things for other developers to worry about it. /mz
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