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Re: vsftpd download backdoored
From: HD Moore <hdm () digitaloffense net>
Date: Tue, 05 Jul 2011 00:05:14 -0500

On 7/5/2011 12:02 AM, Solar Designer wrote:
On Tue, Jul 05, 2011 at 08:21:12AM +0400, Solar Designer wrote:
On Mon, Jul 04, 2011 at 11:04:00PM -0500, HD Moore wrote:
This copy is backdoored and has mtime Feb-15-2011. Chris didn't reply
when I asked him for a copy from his master (old/vsftpd-2.3.4.tar.gz).

http://download.polytechnic.edu.na/pub2/vsftpd/vsftpd-2.3.4.tar.gz

This is very helpful, thank you!  How did you find it?

So, I failed to get this server to give me ctime (looked at HTTP headers
and also tried several FTP commands), and the mtime is Feb 15.  We could
ask the server admins for the ctime.

I think I got the equivalent of the ctime by listing the mtime for ".".
It is Jul 01 22:35.  Not sure what timezone, though.  Some analysis of
other timestamps on that server suggests UTC-1, but Wikipedia says UTC+1
or +2 for Namibia.

So it appears that the backdoor was introduced between June 30 14:15 UTC
and July 1 23:35 UTC (probably before 21:35, though).

Thanks Alexander! I will update references accordingly, nice call on the
o's, ill continue digging there, would love to unmask this asshat
through included env :)

-HD


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