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Secure Networks Inc.
Security Advisory
June 4, 1997
Solaris rpcbind weaknesses
This advisory addresses a vulnerability in Solaris rpcbind implementations.
This vulnerability can aid an attacker in gaining unauthorized access to
hosts running vulnerable versions of the aforementioned software. This
vulnerability allows an attacker to obtain remote RPC program information
even if the standard rpcbind port (port 111) is being filtered.
Problem Description:
~~~~~~~~~~~~~~~~~~~~
The use of an undocumented port under Solaris 2.X for rpcbind.
Solaris 2.x versions of rpcbind listen on an undocumented port in addition
to port 111.
Technical Details:
~~~~~~~~~~~~~~~~~~
On Solaris 2.x operating systems, rpcbind listens not only on TCP port
111, and UDP port 111, but also on a port greater than 32770. This results
in a large number of packet filters, which intend to block access to
rpcbind/portmapper, being ineffective. Instead of sending requests
to TCP or UDP port 111, the attacker simply sends them to a UDP port
greater than 32770 on which rpcbind is listening.
Vulnerable Operating Systems and Software
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The standard rpcbind shipped with Solaris 2.x systems displays this
behaviour. Older SunOS implementations are NOT vulnerable.
Wietse Venema's replacement rpcbind for Solaris 2.x systems does not
exhibit this behaviour.
Fix Information
~~~~~~~~~~~~~~~
The following patches have been made availible at
ftp://sunsolve1.sun.com/pub/patches.
SunOS 5.5.1 104331-02 (Solaris 2.5.1)
SunOS 5.5.1_x86 104332-02 (Solaris 2.5.1 x86)
SunOS 5.5 104357-02 (Solaris 2.5)
SunOS 5.5_x86 104358-02 (Solaris 2.5 x86)
SunOS 5.4 102070-03 (Solaris 2.4)
SunOS 5.4_x86 102071-03 (Solaris 2.4 x86)
SunOS 5.3 102034-02 (Solaris 2.3)
Additional Information
~~~~~~~~~~~~~~~~~~~~~~
Secure Networks Inc. would like to thank Chok Poh <chok@eng.sun.com>
for a quick and professional response to this problem.
You can contact Secure Networks Inc. at <sni@secnet.com> using
the following PGP key:
Type Bits/KeyID Date User ID
pub 1024/9E55000D 1997/01/13 Secure Networks Inc. <sni@secnet.com>
Secure Networks <security@secnet.com>
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Copyright Notice
~~~~~~~~~~~~~~~~
The contents of this advisory are Copyright (C) 1997 Secure Networks
Inc, and may be distributed freely provided that no fee is charged
for distribution, and that proper credit is given.
SunRPC is a trademark of Sun Microsystems.
You can find Secure Networks' advisories at
http://www.secnet.com/advisories.
You can browse our web site at http://www.secnet.com
You can subscribe to our security advisory mailing list by sending
mail to majordomo@secnet.com with the line "subscribe sni-advisories"
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