Solaris rpcbind listens on undocumented high UDP port
| Summary |
|---|
| Description: | rcpbind for solaris, which belongs on UDP port 111, is also found on a UDP port above 32770. Thus many packet filters aren't effective. |
| Author: | Oliver Friedrichs <oliver@silence.secnet.com> (Secure Networks Inc.) |
| Compromise: | Access rcpbind, even from sites that filter it at their firwall or packet filter. |
| Vulnerable Systems: | Unpatched Solaris 2.X up to 2.5.1 |
| Date: | 4 June 1997 |
| Notes: | Apparently rpcbind also lists on high solaris *TCP* ports sometimes. I've included a a hacked rcpinfo client below the secnet advisory. |
| Details |
|---|
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/patches.html
Additional Information
Secure Networks Inc. would like to thank Chok Poh
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.
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.
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