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

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Date: 10/21/05

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    To: security-announce@list.sco.com, bugtraq@securityfocus.com, full-disclosure@lists.grok.org.uk
    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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