[Full-disclosure] OpenServer 5.0.7 : authsh and backupsh buffer overflow

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                    SCO Security Advisory

Subject: OpenServer 5.0.7 : authsh and backupsh buffer overflow
Advisory number: SCOSA-2005.40
Issue date: 2005 October 20
Cross reference: sr894990 fz532992 erg712939 sr894993 fz532995 erg712941 CAN-2005-2926

1. Problem Description

    iDEFENSE has identified a Buffer Overflow vulnerability in
    SCO Openserver backupsh. The backupsh utility is a standard
    binary distributed with Openserver 5.0.7 and earlier. 
   
    Local attackers could supply a specially crafted string to 
    overflow a stack buffer and execute arbitrary code with group 
    backup privileges. Successful exploitation of this vulnerability
    will result in execution of arbitrary code with permissions
    of the running process. The binary is setgid backup by
    default and can be used by attackers with a local account
    to gain backup privileges. 
   
    The Common Vulnerabilities and Exposures project (cve.mitre.org) 
    has assigned the name CAN-2005-2926 to this issue.
   

2. Vulnerable Supported Versions

    System                          Binaries
    ----------------------------------------------------------------------
    OpenServer 5.0.7                /usr/lib/sysadm/authsh
                                    /usr/lib/sysadm/backupsh
   

3. Solution

    The proper solution is to install the latest packages.
   

4. OpenServer 5.0.7

    4.1 Location of Fixed Binaries
   
    ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.40
   
    4.2 Verification
   
    MD5 (VOL.000.000) = ebcf85edb0e7c8c0a3af4cec65a27ed7
   
    md5 is available for download from
            ftp://ftp.sco.com/pub/security/tools
   
    4.3 Installing Fixed Binaries
   
    Upgrade the affected binaries with the following sequence:
   
    1) Download the VOL* files to a directory
   
    2) Run the custom command, specify an install from media
    images, and specify the directory as the location of the
    images.
   

5. References

    Specific references for this advisory:
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2926
   
    SCO security resources:
            http://www.sco.com/support/security/index.html
   
    SCO security advisories via email
            http://www.sco.com/support/forums/security.html
   
    This security fix closes SCO incidents sr894990 fz532992
    erg712939 sr894993 fz532995 erg712941.
   

6. Disclaimer

    SCO is not responsible for the misuse of any of the information
    we provide on this website and/or through our security
    advisories. Our advisories are a service to our customers
    intended to promote secure installation and use of SCO
    products.
   

7. Acknowledgments

    SCO would like to thank iDefense for discovering and reporting
    this weakness.
   

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