AUSCERT External Security Bulletin Redistribution

                  ESB-97.071 -- Sun Security Bulletin #00142
	  	           Vulnerability in rpcbind
                                  5 June 1997


Sun Microsystems, Inc. has released the following advisory concerning a
vulnerability in rpcbind.  This vulnerability can aid an attacker in
gaining unauthorized access to hosts running vulnerable versions of the

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 		   Sun Microsystems, Inc. Security Bulletin
Bulletin Number:	#00142
Date: 			June 4 1997
Title:			Vulnerability in rpcbind

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Permission is granted for the redistribution of this Bulletin, so long as 
the Bulletin is not edited and is attributed to Sun Microsystems. Portions 
may also be excerpted for re-use in other security advisories so long as 
proper attribution is included.

Any other use of this information without the express written consent of 
Sun Microsystems is prohibited. Sun Microsystems expressly disclaims all 
liability for any misuse of this information by any third party.
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1.  Bulletins Topics

    Sun announces the release of patches for Solaris 2.5.1, 2.5, 2.4, and 2.3
    (SunOS 5.5.1, 5.5, 5.4, and 5.3), that relate to a vulnerability in the
    rpcbind program, which can aid an attacker to gain unauthorized access if
    Sun strongly recommends that you install the patches listed in section 4 
    immediately on every affected system.
2.  Who is Affected
       Vulnerable:	SunOS versions 5.5.1, 5.5.1_x86, 5.5, 5.5_x86, 
                                       5.4, 5.4_x86, and 5.3.
       Not vulnerable:	All other supported versions of SunOS
       This vulnerability is fixed in the upcoming release of Solaris.
3.  Understanding the Vulnerability

    The rpcbind program is a server that converts RPC program numbers into
    universal addresses. When an RPC service is started, it tells rpcbind the 
    address at which it is listening, and the RPC program numbers it is 
    prepared to serve. When a client wishes to make an RPC call to a given 
    program number, it first contacts rpcbind on the server machine to 
    determine the address where RPC requests should be sent.
    Under Solaris 2.x, rpcbind listens not only on TCP port 111 and UDP port
    111, but also on a UDP port number greater than 32770. The exact number 
    depends on the OS release and architecture. 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 the other UDP port. This vulnerability allows 
    an attacker to obtain remote RPC program information even if TCP or UDP 
    port 111 is being filtered. It can also aid an attacker to gain 
    unauthorized access to hosts running vulnerable versions of the software.
4.  List of Patches

    The vulnerability relating to rpcbind is fixed by the following patches:

	OS version		Patch ID
	----------		--------
	SunOS 5.5.1		104331-02
	SunOS 5.5.1_x86         104332-02
     	SunOS 5.5		104357-02
     	SunOS 5.5_x86           104358-02
     	SunOS 5.4               102070-03	
	SunOS 5.4_x86           102071-03	
     	SunOS 5.3               102034-02	

5.  Checksum Table

    The checksum table below shows the BSD checksums (SunOS 5.x: /usr/ucb/sum),
    SVR4 checksums (SunOS 5.x: /usr/bin/sum), and the MD5 digital signatures 
    for the above-mentioned patches that are available from:
    These checksums may not apply if you obtain patches from your answer

File Name	  BSD	      SVR4	   MD5
- ---------------   ---------   ---------    --------------------------------
104331-02.tar.Z   64512 111   17253 222    29C2D5649C56A3D64E1F1DFCE3783842
104332-02.tar.Z   56808 111   23404 221    4B5D28F4A686166C4C147BE4E9563B8C
104357-02.tar.Z   27488 111   31772 222    316B03F737FC61DC09877C2BB822E7EE
104358-02.tar.Z   22598 110   46888 220    1665E8724D0A3DB401A00BE812630A37
102070-03.tar.Z   32763 100   14089 200    31FB11BC9D89A6D540F87624D4A2CFAE
102071-03.tar.Z   21217 100   18859 199    76DDAF2CAE25535A9AE932F3B0C98E3A
102034-02.tar.Z   23648 100   49973 199    243CD25673D87D0277F5CFE06E327347

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Sun acknowledges with thanks Secure Networks, Inc. for their assistance in the 
preparation of this bulletin.
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