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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