Security Update: [CSSA-2001-SCO.23] Open Unix, UnixWare 7: dtsession environment buffer overflow

[sco-security () caldera com]

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            Caldera International, Inc. Security Advisory

Subject:                Open Unix, UnixWare 7: dtsession environment buffer overflow
Advisory number:        CSSA-2001-SCO.23
Issue date:             2001 October 1
Cross reference:
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1. Problem Description
        
        Very long environment variables will cause the dtsession
        command to overflow a buffer.  This could be used by an
        unauthorized user to gain privilege.


2. Vulnerable Versions

        Operating System        Version         Affected Files
        ------------------------------------------------------------------
        UnixWare 7              All             /usr/dt/bin/dtsession
        Open Unix               8.0.0           /usr/dt/bin/dtsession


3. Workaround

        None.


4. UnixWare 7

  4.1 Location of Fixed Binaries

        ftp://stage.caldera.com/pub/security/openunix/CSSA-2001-SCO.23/


  4.2 Verification

        md5 checksums:

        2883e2ccdb705dcbe7d57420c59c6391        dtsession.Z


        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:

        # mv /usr/dt/bin/dtsession /usr/dt/bin/dtsession-
        # uncompress /tmp/dtsession.Z
        # cp dtsession /usr/dt/bin
        # cd /usr/dt/bin
        # chown root dtsession
        # chgrp bin dtsession
        # chmod 4555 dtsession


5. References

        This and other advisories are located at
                http://stage.caldera.com/support/security

        This advisory addresses Caldera Security internal incident
        sr850738.

6. Disclaimer

        Caldera International, Inc. is not responsible for the misuse
        of any of the information we provide on our website and/or
        through our security advisories. Our advisories are a service
        to our customers intended to promote secure installation and
        use of Caldera International products.


7. Acknowledgements

        Caldera International wishes to thank KF <dotslash () snosoft com>
        for discovering and reporting this problem.

         
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