OpenServer 5.0.6 OpenServer 5.0.7 : Xsco contains a buffer overflow that could be exploited to gain root privileges.

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Date: 07/30/04

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Date: Fri, 30 Jul 2004 13:27:28 -0700 (PDT)

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    ______________________________________________________________________________

                            SCO Security Advisory

    Subject: OpenServer 5.0.6 OpenServer 5.0.7 : Xsco contains a buffer overflow that could be exploited to gain root privileges.
    Advisory number: SCOSA-2004.3
    Issue date: 2004 July 29
    Cross reference: sr889371 fz528866 erg712547 CAN-2004-0083 CAN-2004-0084 CAN-2004-0106
    ______________________________________________________________________________

    1. Problem Description

            A buffer overflow in ReadFontAlias from dirfile.c of Xsco
            may allow local users and remote attackers to execute
            arbitrary code via a font alias file with a long token.

            The Common Vulnerabilities and Exposures project (cve.mitre.org)
            has assigned the name CAN-2004-0083 to this issue.

            Buffer overflow in the ReadFontAlias function in Xsco,
            when using the CopyISOLatin1Lowered function, may allow
            local or remote authenticated users to execute arbitrary
            code via a malformed entry in the font alias file.

            The Common Vulnerabilities and Exposures project (cve.mitre.org)
            has assigned the name CAN-2004-0084 to this issue.

            Multiple flaws in reading font files.

            The Common Vulnerabilities and Exposures project (cve.mitre.org)
            has assigned the name CAN-2004-0106 to these issues.

    2. Vulnerable Supported Versions

            System Binaries
            ----------------------------------------------------------------------
            OpenServer 5.0.6 /usr/bin/X11/Xsco
            OpenServer 5.0.7 /usr/bin/X11/Xsco

    3. Solution

            The proper solution is to install the latest packages.

    4. OpenServer 5.0.6

            4.1 Location of Fixed Binaries

            ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.3

            4.2 Verification

            MD5 (VOL.000.000) = 7341b2e45bfc55b838009d8a1c49d000

            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. OpenServer 5.0.7

            5.1 Location of Fixed Binaries

            ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.3

            The fixes are also available in SCO OpenServer Release 5.0.7
            Maintenance Pack 3 or later. See
            http://www.sco.com/support/update/download/osr507list.html.

            5.2 Verification

            MD5 (VOL.000.000) = 7341b2e45bfc55b838009d8a1c49d000

            MD5 (507mp3_vol.tar) = c927aefdd50b50aca5d29e08c1562aec

            md5 is available for download from
                    ftp://ftp.sco.com/pub/security/tools

            5.3 Installing Fixed Binaries

            Upgrade the affected binaries with the following sequence:

            1) Download the VOL* files to the /tmp directory

            2) Run the custom command, specify an install from media
            images, and specify the /tmp directory as the location of
            the images.

            Or see the Maintenance Pack 3 Release and Installation Notes at

            ftp://ftp.sco.com/pub/openserver5/507/mp/mp3/osr507mp3.txt

    6. References

            Specific references for this advisory:
                    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0083
                    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0084
                    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0106

            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 sr889371 fz528866
            erg712547.

    7. 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.

    8. Acknowledgments

            Greg MacManus (iDEFENSE Labs) is credited with the discovery
            of this vulnerability. Additionally David Dawes discovered
            further flaws in reading font files.

    ______________________________________________________________________________

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