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Message-ID: <595644e7b370f908a6969f355c2e84e7.squirrel@fbi.dhs.org> Date: Sat, 22 Oct 2011 07:54:47 -0400 (EDT) From: bugs@....dhs.org To: "Tavis Ormandy" <taviso@...xchg8b.com> Cc: full-disclosure@...ts.grok.org.uk Subject: Re: Symlink vulnerabilities I apologize as my search wasn't a complex method, just a quick grep for signs of /tmp misuse. Indeed creating a directory under /tmp is a safeway to handle tmp files. > bugs@....dhs.org wrote: >> >> bashbug: >> >> /usr/bin/bashbug:TEMPDIR=$TMPDIR/bbug.$$ >> >> Maybe I should use bashbug to report a bug in bashbug? >> > > I took a quick look, it's actually using mkdir to create a temporary > directory in /tmp, which it uses for collecting support files. > > This is actually a safe way to use /tmp, assuming you check the return > code > of mkdir (which it does). The mkdir() system call behaves very differently > to open(), and is not vulnerable to these attacks. > > Tavis. > > -- > ------------------------------------- > taviso@...xchg8b.com | pgp encrypted mail preferred > ------------------------------------------------------- > > _______________________________________________ > Full-Disclosure - We believe in it. > Charter: http://lists.grok.org.uk/full-disclosure-charter.html > Hosted and sponsored by Secunia - http://secunia.com/ > _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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