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Category:   Application (Generic)  >   Telnet Vendors:   [Multiple Authors/Vendors]
(MacOS Also Vulnerable) Re: Telnet Daemons May Give Remote Users Root Level Access Privileges
SecurityTracker Alert ID:  1002107
SecurityTracker URL:
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jul 29 2001
Impact:   Execution of arbitrary code via network, Root access via network, User access via network

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.

A user reports that the telnet server on Mac OS X is also vulnerable. For details about the vulnerability, 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:  Apple (Legacy "classic" Mac)
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:  Mac OS X & Darwin/BSD vulnerable to telnetd overflow

[titanium:~/desktop] chrome% ./SPtelnetAYT localhost
Telnetd AYT overflow scanner, by Security Point(R)
Host: localhost
Connected to remote host...
Sending telnet options... stand by...
Telnetd on localhost vulnerable
[titanium:~/desktop] chrome% telnet localhost
Connected to
Escape character is '^]'.

Darwin/BSD (titanium) (ttyp5)

login: ^]
telnet> close
Connection closed.

Note that by default telnet is disabled in /etc/inetd.conf (as are 
most things, except for portmapper/NFS, ugh) so the impact should be 
minimal. If you're not using the OpenSSH included with OS X, you're 

This was tested successfully on Mac OS X 10.0.4 from both the local 
machine, and from a remote Sparc Solaris 2.7 host.

I'd notify Apply, only I have no idea what address to use, and it's 
6am and I've not slept yet (catching up to bugtraq from a 2 week 
holiday, wow, that Code Red thing was bad, glad I wasn't around when 
THAT baby hit, ho ho ho)


"The computer can't tell you the emotional story.
  It can give you the exact mathematical design, but
  what's missing is the eyebrows." - Frank Zappa


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