RSI.0004.06-17-98.BSDI.RLOGIND

[advise () enigma repsec com (RSI Advise)]

RSI.0004.06-17-98.BSDI.RLOGIND


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                   Repent Security Incorporated, RSI
                       [ http://www.repsec.com ]


                       *** RSI ALERT ADVISORY ***


--- [CREDIT] --------------------------------------------------------------

Mark Zielinski: Research and development, author of advisory.


--- [SUMMARY] -------------------------------------------------------------

Announced:     June 17, 1998
Report code:   RSI.0004.06-17-98.BSDI.RLOGIND
Report title:  BSDI rlogind
Vulnerability: A buffer overflow exists in rlogind that could allow remote
               root access on any server running BSDI with rlogind enabled
Vendor status: Has been contacted on 6-17-98
Patch status:  No patch currently available
Platforms:     BSDI 2.0, 2.1, 3.0, 3.1
Not affected:  FreeBSD-Current
               NetBSD-Current
               OpenBSD 2.3
Reference:     http://www.repsec.com/advisories.html
Impact:        If exploited, an attacker could potentially compromise
               root access on your server


--- [DETAILS] -------------------------------------------------------------

Problem:       A vulnerability exists in all current versions of BSDI
               that has the potential to allow an attacker to gain
               remote root access on any server running BSDI with
               rlogind enabled.

               Due to insufficient bounds checking, a buffer
               overflow can result when rlogind attempts to copy the
               connecting hostname into a buffer with a predefined size.

               While overwriting the buffer, the attacker can manipulate
               the stack and execute their own commands, possibly gaining
               root access on the server.

               For more information on this type of attack, point your
               web browsers to: http://www.repsec.com/bofs.html.


--- [FIX] -----------------------------------------------------------------

Solution:      Disable rlogind until Berkeley Software Design Inc.
               can provide a patch.

               1. su to the root account
               2. kill -9 `ps -aux | grep rlogind | awk '{print $2}'`
               3. edit /etc/inetd.conf with your favorite editor
               4. place a # in front of any lines beginning with "login"


--- [PATCH] ---------------------------------------------------------------

Solution:      Wait for Berkeley Software Deisgn Inc. to release an
               official patch.


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Repent Security Incorporated (RSI)
13610 N. Scottsdale Rd.
Suite #10-326
Scottsdale, AZ 85254

E-mail: advise () repsec com
WWW: http://www.repsec.com
FTP: ftp://ftp.repsec.com

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