CERT Advisory 035

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CERT Advisory

 · 4 years ago

  

 
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CA-91:21                     CERT Advisory 
                            December 6, 1991 
		  SunOS NFS Jumbo and fsirand Patches 

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The Computer Emergency Response Team/Coordination Center (CERT/CC) 
has received information concerning several vulnerabilities in Sun 
Microsystems, Inc. (Sun) Network File System (NFS) and the fsirand 
program. These vulnerabilities affect SunOS versions 4.1.1, 4.1, and 
4.0.3 on all architectures. 

Sun has provided separate patches for these vulnerabilities for SunOS 
4.1.1, and has provided an initial patch for SunOS 4.1.  Sun will be 
providing complete patches for 4.1 and 4.0.3 at a later date.  On 
SunOS 4.1.1 systems, Sun states that patch 100173-07 must be installed 
before patch 100424-1.  The patches are available through your local 
Sun Answer Centers worldwide as well as through anonymous ftp from the 
ftp.uu.net (192.48.96.2) system in the /sun-dist directory. 

Fix                        PatchID        Filename            Checksum 
NFS Jumbo 4.1.1            100173-07      100173-07.tar.Z     07044   209 
NFS Jumbo 4.1              100121-08      100121-08.tar.Z     61464   287 
fsirand 4.1.1              100424-01      100424-01.tar.Z     63070    50 

Please note that Sun will occasionally update patch files.  If you 
find that the checksum is different please contact Sun or the CERT/CC 
for verification. 

Sun recommends that sites upgrade to SunOS 4.1.1 to benefit from the 
security improvements.  In addition, they recommend the installation 
of all security-related patches applicable to the version of SunOS 
that you are running. 

A general NFS security note: due to security flaws in the protocol, 
the CERT/CC recommends filtering SunRPC and NFS IP packets (sockets 
111 and 2049) between the local network and the Internet.  This will 
prevent intruders outside your local network from accessing your 
files. 

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NFS Jumbo Patch, SunOS 4.1.1 

I.   Description 

This patch fixes several SunOS NFS bugs (not all security-related). 
The patch file, 100173-07.tar.Z, contains fixes for SunOS version 
4.1.1.  The BugIDs fixed in this patch are: 

1039977 1032959 1029628 1037476 1038302 1034328 1045536 1030884 1045993 
1047557 1052330 1053679 1041409 1065361 1066287 1064433 1070654 

See the README file provided with the patch for more information. 
  
II.  Impact 

These vulnerabilities (and bugs) have multiple impacts, including 
crashing the system, allowing unauthorized system access, and causing 
a problem with file group ownership. 

III. Solution 

Obtain the patch from Sun or from ftp.uu.net and install, following 
the provided instructions, with the following exception: 

line 112 of the README file currently reads: 

    mv /sys/`arch -k`/OBJ/nfs_subr.o /sys/arch -k`/OBJ/nfs_subr.o.FCS 
                                          ^^^^^^^^ 
it should read: 

    mv /sys/`arch -k`/OBJ/nfs_subr.o /sys/`arch -k`/OBJ/nfs_subr.o.FCS 
                                          ^^^^^^^^^ 
(Note the one-character difference.) 
         
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NFS Jumbo Patch, SunOS 4.1 

I.   Description 

This patch fixes several SunOS NFS bugs (not all security-related). 
The patch file, 100121-08.tar.Z, contains fixes for SunOS version 4.1. 
The BugIDs fixed in this patch are: 

1026933 1034007 1039977 1029628 1037476 1038327 1038302 
1034328 1045536 1045993 1047557 1030884 1052330 1053679 

See the README file provided with the patch for more information. 
  
II.  Impact 

These vulnerabilities (and bugs) have multiple impacts, including 
crashing the system, allowing unauthorized system access, and causing 
a problem with file group ownership. 

III. Solution 

Obtain the patch from Sun or from ftp.uu.net and install, following 
the provided instructions. 
         
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fsirand, SunOS 4.1.1 

I.   Description 

A security vulnerability exists in SunOS NFS relating to the way in 
which it allocates file handles.  The patch file, 100424-01.tar.Z, 
contains a fix for SunOS version 4.1.1.  The BugID fixed in this patch 
is 1063470. 

II.  Impact 

The fsirand program could allow a remote system user to guess NFS file 
handles, thereby potentially allowing them to mount and access your 
NFS file systems. 

III. Solution  
         
Obtain the patch from Sun or from ftp.uu.net and install, following 
the provided instructions.  You must install PatchID 100173-07 before 
installing this patch. 

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The CERT/CC wishes to thank Bob Drzyzgula of the Federal Reserve Board, 
Leendert van Doorn of Vrije University, and Wietse Venema of Eindhoven 
University for their assistance. 
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If you believe that your system has been compromised, contact CERT/CC via 
telephone or e-mail. 

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

Computer Emergency Response Team/Coordination Center (CERT/CC) 
Software Engineering Institute 
Carnegie Mellon University 
Pittsburgh, PA 15213-3890 

Past advisories and other information related to computer security are 
available for anonymous ftp from the cert.org (192.88.209.5) 
system. 

 
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