OpenServer 5.0.6 OpenServer 5.0.7 : wu-ftp local users can bypass access restrictions

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______________________________________________________________________________

                        SCO Security Advisory

Subject:                OpenServer 5.0.6 OpenServer 5.0.7 : wu-ftp local users can bypass access restrictions
Advisory number:        SCOSA-2005.6
Issue date:             2005 January 25
Cross reference:        sr889579 fz528958 erg712568 CAN-2004-0148
______________________________________________________________________________


1. Problem Description

        wu-ftpd 2.6.2 and earlier, with the restricted-gid option
        enabled, allows local users to bypass access restrictions
        by changing the permissions to prevent access to their home
        directory, which causes wu-ftpd to use the root directory
        instead. 

        The Common Vulnerabilities and Exposures project (cve.mitre.org) 
        has assigned the name CAN-2004-0148 to this issue.


2. Vulnerable Supported Versions

        System                          Binaries
        ----------------------------------------------------------------------
        OpenServer 5.0.5                Not vulnerable
        OpenServer 5.0.6                /etc/ftpd
        OpenServer 5.0.7                /etc/ftpd

3. Solution

        The proper solution is to install the latest packages.

4. OpenServer 5.0.6

        4.1 First install oss646b or later

        4.2 Location of oss646c

        ftp://ftp.sco.com/pub/openserver5/oss646c/

        4.3 Verification of oss646c

        MD5 (VOL.000.000) = f19b6c6949f615316bfb075d249989e8
        MD5 (VOL.000.001) = 341ff8553aecd2c7b0c2beaf83030d0f
        MD5 (VOL.000.002) = 6e46708ad8029e12280d4f9ac60ab814
        MD5 (VOL.000.003) = 2868b64a6a6db742adb3b485be645d7e
        MD5 (VOL.000.004) = 1696fe1db9bb063827ee5e76e58dff84
        MD5 (VOL.000.005) = f39da342f8af72fcaccdf478dca04109
        MD5 (VOL.000.006) = 2b31611c8af7d2e7910d6e8e3cf701a6
        MD5 (VOL.000.007) = d0175c0f4e3ed29435b1eab95609f8f4
        MD5 (VOL.000.008) = aa9e8a525c341fed077f981b1dacb486
        MD5 (VOL.000.009) = 8e023af67b57507824406bdda322079a
        MD5 (VOL.000.010) = 2b46e8adba8ae0b64109f2069da978a2

        4.4 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.6

        4.5 Verification

        MD5 (VOL.000.000) = 713bab43a71937e8d9ab015de1335a26

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


        4.6 Installing Fixed Binaries

        Upgrade the affected binaries with the following sequence:

        1) Download the VOL* files to a directory

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


5. OpenServer 5.0.7

        5.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.6

        The fixes are also available in SCO OpenServer Release 5.0.7
        Maintenance Pack 3 or later.  See
        http://www.sco.com/support/update/download/osr507list.html.

        5.2 Verification

        MD5 (VOL.000.000) = 713bab43a71937e8d9ab015de1335a26

        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:

        1) Download the VOL* files to a directory

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


6. References

        Specific references for this advisory:
                http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0148

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

        SCO security advisories via email
                http://www.sco.com/support/forums/security.html

        This security fix closes SCO incidents sr889579 fz528958
        erg712568.


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. Acknowledgments

        SCO would like to thank Glenn Stewart

______________________________________________________________________________

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