Security Update: [CSSA-2002-SCO.42] UnixWare 7.1.1 Open UNIX 8.0.0 : in.talkd format string vulnerabilities

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                        SCO Security Advisory

Subject:                UnixWare 7.1.1 Open UNIX 8.0.0 : in.talkd format string vulnerabilities
Advisory number:        CSSA-2002-SCO.42
Issue date:             2002 November 12
Cross reference:
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1. Problem Description

         The in.talkd program is vulnerable to a format string bug
         which can be exploited remotely. An attacker can request
         a talk session with a crafted luser field and be able to
         write memory and gain control of the flow of the in.talkd.
         This vulnerability can also be exploited with the clt_addr
         field and its resolved name (in conjuction with a DNS).


2. Vulnerable Supported Versions

        System                          Binaries
        ----------------------------------------------------------------------
        UnixWare 7.1.1                  /usr/sbin/in.otalkd
                                        /usr/sbin/in.talkd
        Open UNIX 8.0.0                 /usr/sbin/in.otalkd
                                        /usr/sbin/in.talkd

3. Solution

        The proper solution is to install the latest packages.


4. UnixWare 7.1.1

        4.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2002-SCO.42


        4.2 Verification

        MD5 (erg712055.pkg.Z) = 5cd91b194857bb3149efee8bf6e3e804

        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:

        Download erg712055.pkg.Z to the /var/spool/pkg directory

        # uncompress /var/spool/pkg/erg712055.pkg.Z
        # pkgadd -d /var/spool/pkg/erg712055.pkg


5. Open UNIX 8.0.0

        5.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2002-SCO.42


        5.2 Verification

        MD5 (erg712055.pkg.Z) = 5cd91b194857bb3149efee8bf6e3e804

        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:

        Download erg712055.pkg.Z to the /var/spool/pkg directory

        # uncompress /var/spool/pkg/erg712055.pkg.Z
        # pkgadd -d /var/spool/pkg/erg712055.pkg


6. References

        Specific references for this advisory:
                http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2000-1010
                http://www.ngsec.com/docs/advisories/NGSEC-2002-3.txt

        SCO security resources:
                http://www.sco.com/support/security/index.html

        This security fix closes SCO incidents sr864879, fz521053,
        erg712055.


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. Acknowledgements

        It is difficult to say who actually discovered this
        vulnerability. There are many candidates.

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