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            Caldera International, Inc. Security Advisory

Subject: OpenServer 5.0.5, 5.0.6: telnetd buffer overflow
Advisory number: CSSA-2001-SCO.10
Issue date: 2001 August 7
Cross reference:
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1. Problem Description
        
        The telnet daemon /etc/telnetd is subject to a buffer
        overflow problem that could be used by a malicious user to
        gain unauthorized access to a system.

2. Vulnerable Versions

        Operating System Version Affected Files
        ------------------------------------------------------------------
        OpenServer 5 All /etc/telnetd

3. Workaround

        None.

4. OpenServer

  4.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/security/openserver/sr849876/

  4.2 Verification

        md5 checksums:
        
        a3fead5326b361cc9a94f0376fdf0f10 telnetd.Z
        5e7d80c80b1ac2fcde9fc227f6793881 libresolv.so.1.Z
        a5b4e98ace9c64b2129ca53688a98650 libsocket.so.2.Z

        md5 is available for download from

                ftp://ftp.sco.com/pub/security/tools/

  4.3 Installing Fixed Binaries

        Save the erg711793a.Z compressed tar archive into /tmp, and
        install/upgrade the affected binaries with the following commands:

        # cd /tmp
        # uncompress erg711793a.Z
        # tar xvf erg711793a
        # uncompress telnetd
        # mv /etc/telnetd /etc/telnetd.old
        # cp telnetd /etc
        # chown bin:bin /etc/telnetd
        # chmod 711 /etc/telnetd

        In addition, on any pre-5.0.6 system, or on any 5.0.6 system
        without rs506a, execute the following commands:

        # uncompress libsocket.so.2
        # uncompress libresolv.so.1
        # cp libresolv.so.1 /usr/lib
        # cp libsocket.so.2 /usr/lib
        # chown bin:bin /usr/lib/libresolv.so.1
        # chown bin:bin /usr/lib/libsocket.so.2
        # chmod 555 /usr/lib/libresolv.so.1
        # chmod 555 /usr/lib/libsocket.so.2

5. References

        http://www.calderasystems.com/support/security/index.html

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 would like to thank Sebastian
        <scutnb.in-berlin.de> for his posting on bugtraq, and KF
        <dotslashsnosoft.com> for reporting the problem to us.
         
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