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Old 08-16-2006, 08:23 AM   #1
Alexander Turcic
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iLiad Firmware 2.6 files ready to be disassembled

For the binary-obsessed, unquenchable Linux junky, there may be nothing more tantalizing than having access to the files of a Linux system. So are you interested in tinkering with yesterday's firmware upgrade for the iLiad? Then jump over here where you can find the userland files and the kernel image - both in virgin form before the upgrade was actually started.
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Old 08-16-2006, 08:33 AM   #2
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Wow. I mean wow! Just look at /usr/bin/do_updates!

Code:
<snip>

#
# SSH server and root password checks
#

updates_done=0
new_password='b64NybVuHUa/U'

echo -n 'Checking for patches:'

if [ -x /usr/sbin/dropbearmulti ]
then
        echo -n ' rm_sshd'
        /usr/bin/ipkg remove -force-depends dropbear
        updates_done=1
fi

if [ "`grep '^root:' /etc/passwd | cut -d: -f2`" != "${new_password}" ]
then
        echo -n ' passwd'
        sed -i "s,^\\([^:]*\\):[^:]*:0:,\\1:${new_password}:0:," /etc/passwd
        updates_done=1
fi

if [ "${updates_done}" -eq 0 ]
then
        echo -n " none"
fi
echo .
Someone really doesn't like us to have SSH access, right?
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Old 08-16-2006, 09:07 AM   #3
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So basically we need to change the script to add a password we know and maybe remove the dropbear delete code, and then - and I guess that's the harder part - find a way to get it back to the iLiad?
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Old 08-16-2006, 09:43 AM   #4
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hehe glad someone else was able to get it, my attempt failed yesterday.
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Old 08-16-2006, 10:43 AM   #5
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Quote:
Originally Posted by Alexander Turcic
For the binary-obsessed, unquenchable Linux junky, there may be nothing more tantalizing than having access to the files of a Linux system. So are you interested in tinkering with yesterday's firmware upgrade for the iLiad? Then jump over here where you can find the userland files and the kernel image - both in virgin form before the upgrade was actually started.
How did you get the files?!?
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Old 08-16-2006, 11:15 AM   #6
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Quote:
Originally Posted by Tscherno
How did you get the files?!?
From Tad through capturing the packets.
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Old 08-16-2006, 01:15 PM   #7
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Quote:
Originally Posted by deadite66
hehe glad someone else was able to get it, my attempt failed yesterday.
I am not alone anymore :-)

Serious congratulations to the author of the Man-in-the-Middle attack. While it is theoretically standard, it is not easy when you only have one try.
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Old 08-16-2006, 01:28 PM   #8
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Quote:
Originally Posted by TadW
Wow. I mean wow! Just look at /usr/bin/do_updates!
Someone really doesn't like us to have SSH access, right?
It could be claimed that it is a generic security "improvement", but it really address a honestly installed dropbear, not a hidden one from any cracking tool. Nice mine trap in any case, because do_updates was a inert script in previous version (old-root linuxrc doing the real update work) so nothing was expected to jump from it.

At least it is not a personal mine: it does not frozen the iLiad to extract 75 euros from you. On the other hand, it should not be sensible to do it, as an iLiad owner have the right to look into the internals of the firmware (except for propietary code as DisplayMgr and so).
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Old 08-16-2006, 03:06 PM   #9
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HEY, IT IS NOT AGAINST US. Obviously (but it took me one hore walking/thinking) any crack would not bother on installing a .ipkg, it is too critical. And not exacly this .ipkd in any case.

So what is it? It is a tool to remove Irex's own backdoor. It means that irex service will be able to reinstall the package, perhaps remotely, perhaps from a key combination if it is already inside. And it is a security requirement to remove the package on restart even if the engineer forgets to do it.

(The other possibility is that it is a script done as result of lack of coordination between the hierarchy of analysts and programmers at iRex, and while it is typical of a big company, it should be surprising in a small intimate one as iRex is. On the other hand, if it is happening, it could signal corporate paranoia... for instance, any engineer at iRex acting on this forum or trying to contact any member this forum would risk punitive measures and so on. I have seen it to happen in corporate entities and I hope it will not move in this direction)

Last edited by arivero; 08-16-2006 at 03:13 PM.
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Old 08-16-2006, 03:22 PM   #10
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anyone looked into ipkg.conf?

Code:
dest root /
lists_dir ext /var/lib/ipkg

src oe http://10.56.210.143/ipk
The last line is interesting I think. Could they run ipkg over the ssl-tunnel and remotely install packages?
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Old 08-16-2006, 10:03 PM   #11
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Anyone have a capture of the HTTP/HTTPS calls and/or the update/boot details?
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Old 08-17-2006, 03:37 PM   #12
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Quote:
Originally Posted by b_k
anyone looked into ipkg.conf?

Code:
dest root /
lists_dir ext /var/lib/ipkg

src oe http://10.56.210.143/ipk
The last line is interesting I think. Could they run ipkg over the ssl-tunnel and remotely install packages?
"the ssl-tunnel"?? Do you assume there is one?
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Old 08-17-2006, 03:46 PM   #13
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I think it's just a ipkg feed server in their intranet. Note this is a private LAN address.
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Old 08-17-2006, 04:06 PM   #14
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Quote:
Originally Posted by arivero
"the ssl-tunnel"?? Do you assume there is one?
i think i said it wrong.
i was thinking, since it is a private IP, could it be that they somehow involve or plan to use the ipkg package manager to do software updates over the IDS connection.

Maybe this is more clear.
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Old 08-18-2006, 04:56 AM   #15
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Quote:
Originally Posted by b_k
i think i said it wrong.
No, it was clear enough. But it would imply to install the tools for the tunnel, a excesive effort. But not impossible.
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