Date: Wed, 23 Jan 2013 08:47:35 +0100 From: Sebastian Krahmer <krahmer@...e.de> To: oss-security@...ts.openwall.com Subject: Re: CVE Request coreutils On Tue, Jan 22, 2013 at 08:47:46AM -0700, Vincent Danen wrote: > * [2013-01-22 08:25:23 +0100] Sebastian Krahmer wrote: > >> Generally, I see your point. However sometimes services running as >> root 'sort' or 'uniq' user input e.g. via grepping logfiles etc, >> so there is indeed a real chance to indirectly trigger a privilege >> escalation. The past shows that segfaults can be turned into a >> code exec often. Its a stack overflow after all. > > Do you believe this would be the case with modern GCC/Glibc hardening > though? Wouldn't this just be rendered a crash? Are you serious? And since when will CVE's not be assigned because some mitigation could possibly prevent a stack overflow being turned into code exec? > > But even then, if we're talking about logfiles (which is a reasonable > case) you'd have to be allowing user-controlled input to your logs, > which would mean you'd have another problem. You mean like 'logger -t sshd failed login attempt' ? > > I'm also assuming, based on the comments in the first bug, that you need > a really large line (not just an entire file, but one line). How likely > is it that you would be grepping a log file with ~10MB of data on one > line? Not very common indeed, but I think its not the point (logfiles were just _one_ example). Nevertheless, you seem to shift your arguments. For each reason/attack vector I answer, you bring up two new reasons why this not an issue. At the end, I did not spot the bug; if the majority thinks its not worth a CVE, I can live with it. It would just have made tracking easier. regards, Sebastian PS: Reminds me to the one-year dbus discussion where everyone told me that this can never be a problem. -- ~ perl self.pl ~ $_='print"\$_=\47$_\47;eval"';eval ~ krahmer@...e.de - SuSE Security Team
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