Security Update: [CSSA-2002-SCO.27] UnixWare 7.1.1 Open UNIX 8.0.0 : ppptalk root privilege vulnerability

[security () caldera com]

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                Caldera International, Inc.  Security Advisory

Subject:                UnixWare 7.1.1 Open UNIX 8.0.0 : ppptalk root privilege vulnerability
Advisory number:        CSSA-2002-SCO.27
Issue date:             2002 June 18
Cross reference:
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1. Problem Description

        If pppd is running (which it is on a default installation),
        a malicious user can use /usr/bin/ppptalk (or its link,
        /usr/bin/ppp), to gain root privileges.


2. Vulnerable Supported Versions

        System                          Binaries
        ----------------------------------------------------------------------
        UnixWare 7.1.1                  /usr/bin/ppptalk
        Open UNIX 8.0.0                 /usr/bin/ppptalk


3. Solution

        The proper solution is to install the latest packages.
        However, removing the setuid bits from the /etc/ppptalk
        binary will effectively eliminate the vulnerability.


4. UnixWare 7.1.1

        4.1 Location of Fixed Binaries

        ftp://ftp.caldera.com/pub/updates/OpenUNIX/CSSA-2002-SCO.27


        4.2 Verification

        MD5 (erg712071.pkg.Z) = 9e353b58860c1b2ab4e831410f44fa12

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


        4.3 Installing Fixed Binaries

        Upgrade the affected binaries with the following commands:

        Download erg712071.pkg.Z to the /var/spool/pkg directory

        # uncompress /var/spool/pkg/erg712071.pkg.Z
        # pkgadd -d /var/spool/pkg/erg712071.pkg


5. Open UNIX 8.0.0

        5.1 Location of Fixed Binaries

        ftp://ftp.caldera.com/pub/updates/OpenUNIX/CSSA-2002-SCO.27


        5.2 Verification

        MD5 (erg712071.pkg.Z) = 9e353b58860c1b2ab4e831410f44fa12

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


        5.3 Installing Fixed Binaries

        Upgrade the affected binaries with the following commands:

        Download erg712071.pkg.Z to the /var/spool/pkg directory

        # uncompress /var/spool/pkg/erg712071.pkg.Z
        # pkgadd -d /var/spool/pkg/erg712071.pkg


6. References

        Specific references for this advisory:
                none

        Caldera security resources:
                http://www.caldera.com/support/security/index.html

        This security fix closes Caldera incidents sr865661, fz521199
        and erg712071.


7. Disclaimer

        Caldera International, Inc. 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 Caldera products.


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