Security Update: [CSSA-2001-SCO.36.2] REVISED: Open UNIX, UnixWare 7: wu-ftpd ftpglob() vulnerability

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            Caldera International, Inc. Security Advisory

Subject:                REVISED: Open UNIX, UnixWare 7: wu-ftpd ftpglob() vulnerability
Advisory number:        CSSA-2001-SCO.36.2
Issue date:             2002 February 14
Cross reference:        CSSA-2001-SCO.36, CSSA-2001-SCO.36.1
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1. Problem Description
        
        [ The CSSA-2001-SCO.36.1 version of this fix did not handle
        deep recursion of directory hierarchies well ]

        [ The CSSA-2001-SCO.36 version of this fix did not handle
        braces "{" or "}" well ]
        
        A vulnerability in the wu-ftpd ftpglob() function was found by
        the CORE ST team.  This vulnerability may be exploited to
        obtain root access on the ftp server.
   
        An nlist with a deeply recursive argument in an ftpd session
        consumes a very large amount of disk and CPU resources on the
        server, thus constituting a denial of service attack.


2. Vulnerable Versions

        Operating System        Version         Affected Files
        ------------------------------------------------------------------
        UnixWare 7              All             /usr/sbin/in.ftpd
        Open UNIX               8.0.0           /usr/sbin/in.ftpd


3. Workaround

        None.


4. UnixWare 7, Open UNIX 8

  4.1 Location of Fixed Binaries

        ftp://stage.caldera.com/pub/security/openunix/CSSA-2001-SCO.36.2/


  4.2 Verification

        md5 checksums:
        
        MD5 (erg501215b.Z) = 5dc14febd11a88e1b58dfba93f033ea8


        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:

        Download erg501215b.Z to /tmp
        
        # uncompress /tmp/erg501215b.Z
        # pkgadd -d /tmp/erg501215b


5. References

        CORE-20011001: Wu-FTP glob heap corruption vulnerability
        http://www.corest.com

        CERT Advisory CA-2001-33 Multiple Vulnerabilities in WU-FTPD
        http://www.cert.org     

        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2001-0550

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

        This advisory addresses Caldera Security internal incidents
        sr856023, fz519403, erg711908, erg501215.
        

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

        This vulnerability was originally reported by Matt Power of
        BindView on the vuln-dev mailing list.


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