OpenServer 5.0.6 OpenServer 5.0.7 : telnet client multiple issues

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______________________________________________________________________________

                        SCO Security Advisory

Subject:                OpenServer 5.0.6 OpenServer 5.0.7 : telnet client 
multiple issues
Advisory number:        SCOSA-2005.23
Issue date:             2005 May 17
Cross reference:        sr893213 fz531456 erg712802 CAN-2005-0469 CAN-2005-0468
______________________________________________________________________________


1. Problem Description

        Buffer overflow in the slc_add_reply function in various
        BSD-based Telnet clients, when handling LINEMODE suboptions,
        allows remote attackers to execute arbitrary code via a
        reply with a large number of Set Local Character (SLC)
        commands. 

        The Common Vulnerabilities and Exposures project (cve.mitre.org) 
        has assigned the name CAN-2005-0469 to this issue. 

        Heap-based buffer overflow in the env_opt_add function in telnet.c 
        for various BSD-based Telnet clients allows remote attackers to 
        execute arbitrary code via responses that contain a large number 
        of characters that require escaping, which consumers more memory 
        than allocated.

        The Common Vulnerabilities and Exposures project (cve.mitre.org)
        has assigned the name CAN-2005-0468 to this issue.


2. Vulnerable Supported Versions

        System                          Binaries
        ----------------------------------------------------------------------
        OpenServer 5.0.6                /usr/bin/telnet
        OpenServer 5.0.7                /usr/bin/telnet


3. Solution

        The proper solution is to install the latest packages.

4. OpenServer 5.0.6

        4.1 First install oss646c 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 Installation of oss646c

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

        4.5 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.23

        4.6 Verification

        MD5 (VOL.000.000) = 026a2e0cae4a5772e7916945f369cf91

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

        4.7 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-2005.23

        5.2 Verification

        MD5 (VOL.000.000) = 026a2e0cae4a5772e7916945f369cf91

        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-2005-0469 
                http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0468 

        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 sr893213 fz531456
        erg712802.


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 Gal Delalleau and iDEFENSE

______________________________________________________________________________

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