full-disclosure - Re: Symlink vulnerabilities

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Message-ID: <mpro.ltgoei00caln40ks1.taviso@cmpxchg8b.com>
Date: Sat, 22 Oct 2011 11:44:43 +0200
From: Tavis Ormandy <taviso@...xchg8b.com>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: Symlink vulnerabilities

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.

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