CERT Advisory 071

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CERT Advisory

 · 4 years ago

  

 
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CA-93:18                         CERT Advisory 
                               December 15, 1993 
                SunOS/Solbourne loadmodule and modload Vulnerability 
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            *** This advisory supersedes CA-91.22. *** 

The CERT Coordination Center has received information concerning a  
vulnerability in /usr/etc/modload and $OPENWINHOME/bin/loadmodule in Sun 
Microsystems, Inc. SunOS 4.1.1, 4.1.2, 4.1.3, and 4.1.3c and OpenWindows 3.0 
on all sun4 and Solbourne Computer, Inc. architectures.  The problem does not 
exist in Solaris 2.x, Solaris x86, and sun3 architectures (OpenWindows 3.0 
was not released for the sun3 architecture). 

Sun has produced a patch for these vulnerabilities for sun4 architectures. 
It is available through your local Sun Answer Center as well as through 
anonymous FTP from the ftp.uu.net system in the /systems/sun/sun-dist 
directory or from the ftp.eu.net system in the /sun/fixes directory. 

Solbourne has announced a workaround that is included below. 

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I.   Description 

     loadmodule(8) and modload(8) can be exploited to execute a user's  
     program using the effective UID of root. 

II.  Impact 

     This vulnerability allows a local user to gain root access. 

III. Solution 

     A. SunOS Solution 

     Obtain and install the appropriate patches according to the  
     instructions included with the patches. 

     Module           Patch ID        Filename 
     ----------       ---------       --------------- 
     loadmodule       100448-02       100448-02.tar.Z 

                  BSD Checksum = 19410 5 
                  MD5 Checksum = 0215910cf65e055ed3042070bd961a22 

     modload          101200-02       101200-02.tar.Z 

                  BSD Checksum = 41677 28 
                  MD5 Checksum = 626ab2917204eb6e6eb5f165cca3e908 

 
     B. Solbourne Solution 

     Solbourne systems do not support the "loadmodule" functionality. 
     This vulnerability can be fixed on Solbourne systems by removing 
     the setuid bit: 

        chmod 0755 /usr/openwin/bin/loadmodule 

     The modload program does not need to replaced or changed. 

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The CERT Coordination Center wishes to thank Sun Microsystems, Inc. 
and Solbourne Computers, Inc. for their support in responding 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 Forum of Incident 
Response and Security Teams (FIRST). 

Internet E-mail: cert@cert.org 
Telephone: 412-268-7090 (24-hour hotline) 
           CERT personnel answer 8:30 a.m.-5:00 p.m. EST(GMT-5)/EDT(GMT-4), 
           and are 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 info.cert.org. 

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