Security Update: [CSSA-2002-SCO.19] OpenServer 5.0.5 OpenServer 5.0.6 : yppasswdd remotely exploitable buffer overflow

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                Caldera International, Inc.  Security Advisory

Subject:                OpenServer 5.0.5 OpenServer 5.0.6 : yppasswdd remotely exploitable buffer overflow
Advisory number:        CSSA-2002-SCO.19
Issue date:             2002 May 20
Cross reference:
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1. Problem Description

        A buffer overflow vulnerability has been discovered in
        /etc/yppasswdd which may be exploited by a local or a remote
        attacker to gain root access on the NIS master server system.


2. Vulnerable Supported Versions

        System                          Binaries
        ----------------------------------------------------------------------
        OpenServer 5.0.5                /etc/yppasswdd
        OpenServer 5.0.6                /etc/yppasswdd


3. Solution

        The proper solution is to install the latest packages.


4. OpenServer 5.0.5

        4.1 Location of Fixed Binaries

        ftp://stage.caldera.com/pub/security/openserver/CSSA-2002-SCO.19


        4.2 Verification

        MD5 (VOL.000.000) = d683b9007da3efc51a9f6f9db7270ec2

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


        4.3 Installing Fixed Binaries

        Upgrade the affected binaries with the following commands:

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

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


5. OpenServer 5.0.6

        5.1 Location of Fixed Binaries

        ftp://stage.caldera.com/pub/security/openserver/CSSA-2002-SCO.19


        5.2 Verification

        MD5 (VOL.000.000) = d683b9007da3efc51a9f6f9db7270ec2

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


        5.3 Installing Fixed Binaries

        Upgrade the affected binaries with the following commands:

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

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


6. References

        Specific references for this advisory:
                http://www.kb.cert.org/vuls/id/327281

        Caldera UNIX security resources:
                http://stage.caldera.com/support/security/

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

        This security fix closes Caldera incidents sr854485,
        SCO-559-1316, and erg711875 .


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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