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OpenServer 5.0.7 : authsh and backupsh buffer overflow
From: please_reply_to_security () sco com
Date: Thu, 20 Oct 2005 15:46:32 -0700


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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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