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Date: Wed, 6 Jul 2011 22:48:17 -0700
From: Chris Evans <>
To: HD Moore <>
Cc: Solar Designer <>,
Subject: Re: vsftpd download backdoored

On Mon, Jul 4, 2011 at 9:04 PM, HD Moore <> wrote:
> On 7/4/2011 10:58 PM, Solar Designer wrote:
>> What mirror?  As far as I'm aware, from the announcement by Chris, only
>> the official distribution site for vsftpd was compromised.
> [ snip ]
>> Maybe.  Do you have a copy of the backdoored tarball?  I don't, and no
>> one on forums where I saw this discussed appears to have it (which
>> confirms that it existed for a very short period of time only).
> 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).

Yeah, on vacation at the moment but looks like you found a good alternative?
FWIW, https://docs.

Seems strange to me that the attacker would remember to update mtime
on the replacement tarball, but leave .o files kicking around (thus
also changing tarball size radically).


>> Are you trying to say that Debian got the backdoored copy?  This is news
>> to me.
> No, I am saying that for this to become as widespread as the mtime in
> the mirror above indicates, it would be incredible for distros like
> Debian to not notice it, as they verify the hash of the tarball. This
> indicates that the mtime in the mirror above was forged (since the hash
> is indeed wrong), but the real question is how this mirror obtained the
> copy.
> Was the mirror compromised? Was a rsync job used against the real
> server, in which case the mtime was preserved? I couldn't find any
> public copies with the backdoored checksum, but one of the metasploit
> contributors pointed me to the link above.
> I would like to believe the exposure was limited to 1-3 days, but the
> mirror above casts doubt on this.
> -HD

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