F14 AMI passwords

[Pete Zaitcev]

Looking at the /etc/shadow in our official AMI ami-6e3a6a2b, I observed
that root and ec2-user have passwords. Why are they left in? I suppose
they do not hurt much, since sshd_config sets PasswordAuthentication
and PermitRootLogin to no. Still, I'm just curious what they are.

Even better, let's think in reverse: if the creator accidentially
used a real root password, can I crack any interesting servers by
cracking the root password and then applying it to bits of Fedora
infrastructure (I know it's not 3-DES anymore, but still)?

-- Pete

[Jan Pazdziora]

On Thu, Nov 18, 2010 at 10:19:51PM -0700, Pete Zaitcev wrote:
>  Looking at the /etc/shadow in our official AMI ami-6e3a6a2b, I
> observed
>  that root and ec2-user have passwords. Why are they left in? I suppose
>  they do not hurt much, since sshd_config sets PasswordAuthentication
>  and PermitRootLogin to no. Still, I'm just curious what they are.
>  
>  Even better, let's think in reverse: if the creator accidentially
>  used a real root password, can I crack any interesting servers by
>  cracking the root password and then applying it to bits of Fedora
>  infrastructure (I know it's not 3-DES anymore, but still)? 
The passwords seem to be reset in /etc/rc.local by an random string.
I was surprised to see the passwords change upon every reboot but
it the found the cause and thought that maybe the AMI authors had good
reason to set it up this way.

-- 
Jan Pazdziora
Principal Software Engineer, Satellite Engineering, Red Hat

[Mike McGrath]

On Fri, 19 Nov 2010, Jan Pazdziora wrote:

>  On Thu, Nov 18, 2010 at 10:19:51PM -0700, Pete Zaitcev wrote:
>  > Looking at the /etc/shadow in our official AMI ami-6e3a6a2b, I observed
>  > that root and ec2-user have passwords. Why are they left in? I suppose
>  > they do not hurt much, since sshd_config sets PasswordAuthentication
>  > and PermitRootLogin to no. Still, I'm just curious what they are.
>  >
>  > Even better, let's think in reverse: if the creator accidentially
>  > used a real root password, can I crack any interesting servers by
>  > cracking the root password and then applying it to bits of Fedora
>  > infrastructure (I know it's not 3-DES anymore, but still)?
>
>  The passwords seem to be reset in /etc/rc.local by an random string.
>  I was surprised to see the passwords change upon every reboot but
>  it the found the cause and thought that maybe the AMI authors had good
>  reason to set it up this way.
>  
shouldn't !! lock the password without disabling the account?  Or is that
behavior different for the root account?

	-Mike

[Jared K. Smith]

On Tue, Nov 30, 2010 at 9:42 PM, Mike McGrath <mmcgrath(a)redhat.com&gt; wrote:
>  shouldn't !! lock the password without disabling the account?  Or
> is that
>  behavior different for the root account? 
Yes, I think you're correct.  It's my understanding that it is the
same for the root account as it is for any other.

--
Jared Smith
Fedora Project Leader