From: Sorin Ionescu <sorin.ionescu@gmail.com>
To: Jeremy Mates <jeremy.mates@gmail.com>
Cc: zsh-workers@zsh.org
Subject: Re: default TMPPREFIX unsafe if local malicious users
Date: Wed, 29 Aug 2012 21:41:33 -0400 [thread overview]
Message-ID: <966E7D56-AC76-4B5B-88DE-B5E625048DE7@gmail.com> (raw)
In-Reply-To: <10BDFE08-7B52-4775-BD19-C5A1B7498202@gmail.com>
On Mac OS X, a temporary directory with permissions 700 is created for each user at login: /var/folders/jp/qsb33jvx5hj6vv3zv3rhcgn00000gn/T/.
$TMPPREFIX should be set to $TMPDIR/zsh, not /tmp/zsh.
Sorin
On 29 Aug 2012, at 19:13, Jeremy Mates wrote:
> The default TMPPREFIX of /tmp/zsh allows arbitrary file overwrite should a local malicious user have write access to /tmp, for example if the target user uses the Functions/Zle/edit-command-line feature after the following is performed:
>
> for i in {1..99999}; do ln -s /user/file/to/clobber /tmp/zshecl$i; done
>
> This issue could perhaps be avoided by locally setting the NOCLOBBER option for all code that uses TMPPREFIX, or by providing a mktemp(3) interface (if available)?
>
> Jeremy
prev parent reply other threads:[~2012-08-30 2:12 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-29 23:13 Jeremy Mates
2012-08-30 1:41 ` Sorin Ionescu [this message]
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