From: McKenna Henage (mckennage@hotmail.com)
Date: Wed Aug 11 2004 - 20:26:40 EDT
I'm wrapping up a pen-test and I've gained access to a
NetWare-Enterprise-Web-Server/5.1 box through the ability to run Perl
commands using specially crafted URLs (e.g.,
"perl/-e%20system(%22dir%22);"). I wrote a program in Perl that crafts the
URLs to allow me to easily read any file on the server, write to any file,
or execute any command. However, without any Novell experience (I am a MS
and Linux guy), I am unable to escalate to the point of being able to attack
other systems on the client's network.
Any suggestions for ways I can use this Netware box to further exploit their
networks would be very much appreciated. In particular, I'm interested in
discovering what other devices are on their network (since I can only see
their Netware box from the Internet), performing port scans, vulnerability
scans, etc. I need to be nice to the server since it is in production, so
I'm trying not to experiment too much on their machine and risk bringing it
down (already crashed it once!).
I've already done some research on Netware, including listening to RFP's
Black Hat talk on Netware, and reading the "Novell Hacking FAQ" available on
the web. Unfortunately most resources I've found refer to Netware 2.x, 3.x,
and 4.x. Here is what I've been able to gain so far, thanks to having
partial access to files on the system using directory traversal:
-Internal IP address
-IPX servers (running the command “display ipx servers”)
-See unencrypted passwords in /system/autoexec.ncf and /etc/netinfo.cfg (and
to crack a password in /Novonyx/suitespot/admin-serv/config/ADMPW)
-Successfully ping out to a device on the Internet (unfortunately it appears
to be continuous, because I wasn’t able to stop it)
-…and pretty much anything else that is in a file, or almost any command
I have run into some limits:
-Any request I make (to read/write a file or execute a command) is limited
in character length, hampering my ability to execute an elaborate Perl
program on the box or even to read some files that are too far down the
directory tree
-Haven't found a way to send some characters such as " and ', even after
trying everything I could think of (encoding, double encoding, etc.). Wish I
could do that because then I could essentially start writing a new Perl
script to their machine and overcome the character limitation just
mentioned, and potentially find a way to upload a Perl port scanner of some
sort.
-An inability to correctly view all files. Since I'm getting the files fed
back in a web browser, I can sometimes only see the first parts of a file
(up to 500K or so), and have trouble downloading binaries.
-An inability to see the entire results of a command run on the system. I
can run a command, but then to see the results I have to open
/etc/console.log and read the last few lines (so I can't always see the
entire results, because it appears to be cut off in the log).
-I don’t even know how to download files to the Netware box. I have been
unable to determine if it has a HTTP or FTP client I can use to pull down a
trojan/backdoor program, netcat, or anything else.
-Some blockage at the firewall (?). For example, I tried loading the remote
console and then accessing it remotely, but it appears to be blocked at the
firewall since I can’t get in. If it were a Linux/Unix/Windows box then I’d
know how to download a SSH client and reverse-tunnel a connection out
through the firewall, but I’m clueless on Netware.
Thanks in advance for any suggestions you can provide in the next couple
days.
Beme Lee
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