full-disclosure - Re: one of my servers has been compromized

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Message-ID: <11536.1323193036@turing-police.cc.vt.edu>
Date: Tue, 06 Dec 2011 12:37:16 -0500
From: Valdis.Kletnieks@...edu
To: Lucio Crusca <lucio@...web.org>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: one of my servers has been compromized

On Mon, 05 Dec 2011 19:04:02 +0100, Lucio Crusca said:

> Using dd on /dev/mem and piping results through netcat it's not that 
> difficult, and a bit of google explains how to do it the right way, but in 
> my case there are two other problems:

Note that the effectiveness and safety of doing a dd on /dev/mem is highly
dependent on kernel configuration and release.  See CONFIG_STRICT_DEVMEM
and CONFIG_DEVKMEM for details.  Also, some I/O hardware behaves strangely
or badly when you accidentally read from memory-mapped control registers (which
was one of the reasons for STRICT_DEVMEM being added).

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