Re: [Asrg] Countering Botnets to Reduce Spam

Chris Lewis <clewis+ietf@mustelids.ca> Sat, 15 December 2012 17:33 UTC

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Date: Sat, 15 Dec 2012 12:33:07 -0500
From: Chris Lewis <clewis+ietf@mustelids.ca>
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Subject: Re: [Asrg] Countering Botnets to Reduce Spam
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On 12-12-15 11:38 AM, Barry Shein wrote:
> 
> On December 14, 2012 at 10:08 clewis+ietf@mustelids.ca (Chris Lewis) wrote:

>  > Compromised Linux machines (mostly servers) are now responsible for ~40%
>  > of all spam.

> Any information on how they are being compromised?

- Wordpress and Joomla seem to be subject to a never-ending blizzard of
various file-upload compromises.  While ensuring that the customers
using them are using the very latest patches seems to help a _lot_,
that's apparently something that not all hosters attempt to enforce, and
tomorrow there'll be another compromise discovered.

- Some multi-host platforms are inherently leaky.  IIUC, Cpanel has anon
ftp turned on by default.

- Files uploaded via compromised customer userid/password are extremely
common, and have been for quite a while.  Small-medium environments are
under surprisingly high phishing pressure.  Even my teensy regional ISP
is subject to a never ending wave of phishes.