tempfile.mktemp() and symlink attacks

Aahz aahz at pythoncraft.com
Mon Nov 18 16:04:25 EST 2002


[I'm reposting this because nobody followed up to it.  I tried doing
some research because I know there have been changed for Python 2.3, but
I wasn't able to find the relevant posts on python-dev.]

In article <3ygu9.105734$La5.330766 at rwcrnsc52.ops.asp.att.net>,
Kent Hu  <kenthu at kenNOSPAMthu.net> wrote:
>Is using tempfile.mktemp() vulnerable to symlink attacks?  The reason I ask 
>is that the documentation for os.tempnam() and os.tmpnam() has warnings 
>about symlink attacks, but the documentation for tempfile.mktemp() does 
>not.  Also, running os.tempnam() and os.tmpnam() actually brings a 
>RuntimeWarning, while I tried comparing the implementations, but couldn't 
>find the source for os.tempnam() and os.tmpnam() in os.py (I'm using 
>version 2.2.1).
>
>Now, if tempfile.mktemp() is vulnerable, I think the docs should say so.  
>And if it's not vulnerable, the docs for os.tempnam() and os.tmpnam() 
>should refer readers to tempfile.mktemp() instead of os.tmpfile(), since 
>tempfile.mktemp() is more functionally similar.
>
>Kent Hu
>
>
>Relevant links:
>http://www.python.org/doc/current/lib/os-file-dir.html
>http://www.python.org/doc/current/lib/module-tempfile.html


-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

A: No.
Q: Is top-posting okay?



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