CERT Advisory 067

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CERT Advisory

 · 4 years ago

  

 
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CA-93:13                         CERT Advisory 
                               September 17, 1993 
                        SCO Home Directory Vulnerability 
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The CERT Coordination Center has received information indicating that SCO 
Operating Systems may be vulnerable to a potential compromise of system 
security.  This vulnerability allows unauthorized access to the "dos" and 
"asg" accounts, and, as a result of this access, unauthorized access to  
the "root" account may also occur. 

The following releases of SCO products are affected by this vulnerability: 

     SCO UNIX System V/386 Release 3.2 Operating System 
     SCO UNIX System V/386 Release 3.2 Operating System Version 2.0 
     SCO UNIX System V/386 Release 3.2 Operating System version 4.x 
     SCO UNIX System V/386 Release 3.2 Operating System Version 4.0 with 
         Maintenance Supplement Version 4.1 and/or Version 4.2 
     SCO Network Bundle Release 4.x 
     SCO Open Desktop Release 1.x 
     SCO Open Desktop Release 2.0 
     SCO Open Desktop Lite Release 3.0 
     SCO Open Desktop Release 3.0 
     SCO Open Server Network System Release 3.0 
     SCO Open Server Enterprise System Release 3.0 

CERT and The Santa Cruz Operation recommend that all sites using these SCO 
products take action to eliminate the source of vulnerability from their 
systems.  This problem will be corrected in upcoming releases of SCO 
operating systems.  

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I.   Description 

     The home directories of the users "dos" and "asg" are /tmp and 
     /usr/tmp respectively. These directories are designed to have  
     global write permission.  

II.  Impact 

     This vulnerability may allow unauthorized users to gain access to  
     these accounts. This vulnerability may also corrupt certain binaries  
     in the system and thus prevent regular users from running them, as well  
     as introduce a potential for unauthorized root access. 

III. Solution 

     All affected sites should follow these instructions: 

     1. Log onto the system as "root" 
     2. Choose the following sequence of menu selections from 
        the System Administration Shell, which is invoked by 
        typing "sysadmsh" 

        a. Accounts-->User-->Examine--> 
           [select the "dos" account] -->Identity 
           -->Home directory-->Create-->Path--> 
           [change it to /usr/dos instead of /tmp]--> confirm 

        b. Accounts-->User-->Examine--> 
           [select the "asg" account] -->Identity 
           -->Home directory-->Create-->Path--> 
           [change it to /usr/asg instead of /usr/tmp]--> confirm 

     3. If DOS binaries have been modified, or sites are unable to  
        determine if modification has occurred, we strongly recommend  
        removing and reinstalling the DOS package of the Operating System  
        Extended Utilities.  This can be done using custom(ADM). 

        Sites may also want to check their systems for signs of further 
        compromise. This can be facilitated through the use of programs 
        such as COPS. Other security advice and suggestions can be found 
        in CERT's security checklist. This checklist may be obtained  
        through anonymous FTP from cert.org in pub/tech_tips/security_info. 

        Note: COPS may be obtained from many sites, including via  
        anonymous FTP from cert.org in the pub/tools directory. 

If you have further questions about this issue, please contact SCO Support  
and ask for more information concerning this CERT advisory, CA-93:13, "SCO  
Home Directory Vulnerability." 

        Electronic mail: support@sco.COM 

        USA/Canada: 6am-5pm Pacific Daylight Time (PDT) 
        ----------- 
        1-800-347-4381  (voice) 
        1-408-427-5443  (fax) 

        Pacific Rim, Asia, and Latin American customers: 6am-5pm Pacific 
        ------------------------------------------------ Daylight Time  
                                                         (PDT) 
        1-408-425-4726  (voice) 
        1-408-427-5443  (fax) 

        Europe, Middle East, Africa: 9am-5:30pm British Standard Time (BST) 
        ---------------------------- 
        +44 (0)923 816344 (voice) 
        +44 (0)923 817781 (fax) 

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The CERT Coordination Center wishes to thank Christopher Durham of the Santa 
Cruz Operation for reporting this problem and his assistance 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 cert.org (192.88.209.5). 

 
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