CERT Advisory 055

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CERT Advisory

 · 4 years ago

  

 
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CA-93:01                         CERT Advisory 
                               January 13, 1993 
                Revised Hewlett-Packard NIS ypbind Vulnerability 

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                   *** THIS IS A REVISED CERT ADVISORY *** 
   *** IT CONTAINS NEW INFORMATION REGARDING AVAILABILITY OF IMAGE KITS *** 
                  *** SUPERSEDES CERT ADVISORY CA-92:17 *** 

The CERT Coordination Center has received information concerning a 
vulnerability in the NIS ypbind module for the Hewlett-Packard (HP) 
HP/UX Operating System for series 300, 700, and 800 computers.  

HP has provided revised patches for all of the HP/UX level 8 releases 
(8.0, 8.02, 8.06, and 8.07).  This problem is fixed in HP/UX 9.0. 
The following patches have been superseded: 

              Patch ID        Replaced by Patch ID 
              PHNE_1359       PHNE_1706 
              PHNE_1360       PHNE_1707 
              PHNE_1361       PHNE_1708 

All HP NIS clients and servers running ypbind should obtain and  
install the patch appropriate for their machine's architecture 
as described below. 

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I.   Description 

     A vulnerability in HP NIS allows unauthorized access to NIS data. 

II.  Impact 

     Root on a remote host running any vendor's implementation of NIS 
     can gain root access on any local host running HP's NIS ypbind.  
     Local users of a host running HP's NIS ypbind can also gain root access. 

III. Solution 
         
     1) All HP NIS clients and servers running ypbind should obtain and  
        install the patch appropriate for their machine's architecture. 

        These patches contain a version of ypbind that only accepts ypset 
        requests from a superuser port on the local host.  This prevents 
        a non-superuser program from sending rogue ypset requests to ypbind. 
        They also include the mod from the superseded patches which prevented 
        a superuser on a remote system from issuing a ypset -h command 
        to the local system and binding the system to a rogue ypserver. 

        These patches may be obtained from HP via FTP (this is NOT 
        anonymous FTP) or the HP SupportLine.  To obtain HP security 
        patches, you must first register with the HP SupportLine. 
        The registration instructions are available via 
	anonymous FTP at cert.org (192.88.209.5) in the file 
	"pub/vendors/hp/supportline_and_patch_retrieval". 
        The new patch files are: 

     Architecture Patch ID   Filename                               Checksum 
     ------------ --------   --------                               -------- 
     Series 300   PHNE_1706  /hp-ux_patches/s300_400/8.X/PHNE_1706  38955 212 
     Series 700   PHNE_1707  /hp-ux_patches/s700/8.X/PHNE_1707        815 311 
     Series 800   PHNE_1708  /hp-ux_patches/s800/8.X/PHNE_1708      56971 299 

     2) The instructions for installing the patch are provided in the 
        PHNE_xxxx.text file (this file is created after the patch has 
        been unpacked). 

        The checksums listed above are for the patch archive files from HP. 
        Once unpacked, each shell archive contains additional checksum  
        information in the file "patchfilename.text".  This checksum is 
        applicable to the binary patch file "patchfilename.updt". 

 
If you have any questions about obtaining or installing the patches, 
contact the USA HP SupportLine at 415-691-3888, or your local HP 
SupportLine number.  Please note that the telephone numbers in this 
advisory are appropriate for the USA and Canada.  

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The CERT Coordination Center wishes to thank Brian Kelley of Ford Motor 
Company for bringing this vulnerability to our attention.  We would also 
like to thank Hewlett-Packard for their response to this problem.  
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If you believe that your system has been compromised, contact the CERT 
Coordination Center or your representative in FIRST (Forum of Incident 
Response and Security Teams). 

Internet E-mail: cert@cert.org 
Telephone: 412-268-7090 (24-hour hotline) 
           CERT personnel answer 7:30 a.m.-6:00 p.m. EST(GMT-5)/EDT(GMT-4), 
           on call for emergencies during other hours. 

CERT Coordination Center 
Software Engineering Institute 
Carnegie Mellon University 
Pittsburgh, PA 15213-3890 

Past advisories, information about FIRST representatives, and other 
information related to computer security are available for anonymous FTP 
from cert.org (192.88.209.5). 

 
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