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Category:   Application (Generic)  >   Telnet Vendors:   [Multiple Authors/Vendors]
(Netkit = .17 is Vulnerable) Re: Telnet Daemons May Give Remote Users Root Level Access Privileges
SecurityTracker Alert ID:  1002166
SecurityTracker URL:  http://securitytracker.com/id/1002166
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Aug 9 2001
Impact:   Execution of arbitrary code via network, Root access via network, User access via network
Fix Available:  Yes  Exploit Included:  Yes  
Version(s): netkit <= .17
Description:   TESO reported that many BSD-derived Telnet daemons (servers) contain a vulnerability that may allow a remote user to obtain root level access on the server.

It is reported that netkit up to and including version .17 is vulnerable. The original report had noted that versions higher than .14 were not vulnerable, but this is reportedly not the case.

The Source Message contains a patch and some demonstration exploit code. Details on the conditions required to exploit this version are included in the Source Message.

For additional details on the original vulnerability report, see the Message History.

Impact:   A remote user can execute arbitrary code on the server with the privileges of the telnet server, which is typically root level privileges.
Solution:   No solution was available at the time of this entry.
Cause:   Boundary error
Underlying OS:  Linux (Any), UNIX (Any)
Underlying OS Comments:  many Linux and Unix OSs are vulnerable, but not all - see the Alert text for more information

Message History:   This archive entry is a follow-up to the message listed below.
Jul 18 2001 Telnet Daemons May Give Remote Users Root Level Access Privileges



 Source Message Contents

Subject:  ADV/EXP: netkit <=0.17 in.telnetd remote buffer overflow


---1463783680-1194109795-997359229=:10117
Content-Type: TEXT/PLAIN; charset=US-ASCII

************************************************************************
Product:     netkit telnet protocol daemon, in.telnetd

Version:     netkit-telnet-0.17 (and previous)  /usr/sbin/in.telnetd

Severity:    High

Remote:      Yes

Allows:      Remote ROOT level access.

Workaround:  Disable telnet access.

Fix:         Check with your vendor for an updated package.

************************************************************************
<from http://www.securityfocus.com/archive/1/197804, posted by
<scut@nb.in-berlin.de>.

   To:         BugTraq
   Subject:    multiple vendor telnet daemon vulnerability
   Date:       Wed Jul 18 2001 22:15:10
...
    System                                  | vulnerable   | exploitable *
    ----------------------------------------+--------------+------------
...                                         |              |
    Linux netkit-telnetd >= 0.14            |       no     |
...                                         |              |
    The bug has been discovered by scut. (It is easy to spot, so I do not
    want to rule out discoveries by other persons)
...
    The tests and further analysis were done by smiler, lorian, zip and scut.
...

<end of message>

TESO were wrong about netkit >=0.14 not being vulnerable.

************************************************************************
Requires:  Currently running telnet daemon (often on by default)

 /usr/in.telnetd  <= netkit-telnet-0.17
 (telnet-0.17-7 is the default in.telnetd for Redhat 7.0)

 GLIBC > 2.0.6

************************************************************************
Description of problem:

The version of /usr/sbin/in.telnetd that comes as default on Redhat 7.0,
and many other distributions contains an exploitable overflow in the
handling of its output, allowing execution of arbitrary commands.

The problem is in the handling of the AYT commands, as described in the
advisory already linked.

************************************************************************
Exploit details: (the attached file zp-exp-telnetd.c)

If the user has local access to the system, it is possilble to get the
program to set arbitrary environment variables in the environment of
/bin/login.
e.g. LD_PRELOAD=/tmp/make-rootshell.so

By filling the heap, in a similar way to the teso exploit, it its possible
to set 2 or more environment variables.

If the user doesn't have local access, it is possible to overwrite the
chunk header information for a pointer used by setenv(3), and store a new
chunk in a user controllable location, so when the envrionement gets
reallocated it will change the value of arbitrary memory locations.

e.g. You could cause the pointer to set the length of the previous chunk
to the distance back from the chunk to a point in netibuf, which itself
contains a chunk to set the address of a function in the GOT to point to
shellcode, which could also be stored in the network input buffer.

Sometimes bad things happen that you have to kludge to fix. e.g.
push_clean() in the proof of concept exploit. Sometimes I got some
characters from the previous input being sent again, and when that was a
command to set an environment variable or something else that changed the
environment, it kinda messed with malloc calculations a little.

As it is, this exploit will probably not work on your machine, but
carefully modifying appropriate values should fix that.


-- zen-parse
      ____   http://mp3.com/cosv  _______
     / ___\  __     _______      / _____/     __
    / /_____/  \   /  ____ \    / /    ______/  \__________
    \______  /\ \__\  \   \ \  / /    /_gone_\__/_platinum_\
           \ \/ ______/    \ \/ /     \______/  \__________/
            \__/            \__/             \__/
-- ObPlug: Buy our CD!

-- Available: For work in the security industry. (email for details)

-------------------------------------------------------------------------
The preceding information, unless directly posted by zen-parse@gmx.net to
an open forum is confidential information and not to be distributed
(without explicit permission being given by zen-parse@gmx.net). Legal
action may be taken to enforce this. If you are mum or dad, this probably
doesn't apply to you.


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