[Full-disclosure] SCOSA-2006.7 OpenServer 5.0.7 OpenServer 6.0.0 : Lynx Multiple Vulnerabilities

[security@xxxxxxx]

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                        SCO Security Advisory

Subject:                OpenServer 5.0.7 OpenServer 6.0.0 : Lynx Multiple 
Vulnerabilities
Advisory number:        SCOSA-2006.7
Issue date:             2006 January 10
Cross reference:        fz533159 fz533314
                        CVE-2005-2929 CVE-2005-3120
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1. Problem Description

        Lynx NNTP Buffer Overflow Vulnerability:

        Ulf Harnhammar has reported a vulnerability in Lynx, which can
        be exploited by malicious people to compromise a user's system.

        The vulnerability is caused due to a boundary error in the
        "HTrjis()" function in the handling of article headers sent from
        NNTP (Network News Transfer Protocol) servers. This can be
        exploited to cause a stack-based buffer overflow by e.g.
        tricking a user into visiting a malicious web site which
        redirects to a malicious NNTP server via the "nntp:"; URI
        handler.

        Successful exploitation allows execution of arbitrary code.

        The Common Vulnerabilities and Exposures project (cve.mitre.org)
        has assigned the name CVE-2005-3120 to this issue.

        Lynx Command Injection Vulnerability:

        Remote exploitation of a command injection vulnerability  could
        allow attackers to execute arbitrary commands with the
        privileges of the underlying user.

        The problem specifically exists within the feature to execute
        local cgi-bin programs via the "lynxcgi:" URI handler. The
        handler is generally intended to be restricted to a specific
        directory or program(s). However, due to a configuration error
        on multiple platforms, the default settings allow for arbitrary
        websites to specify commands to run as the user running Lynx.

        The Common Vulnerabilities and Exposures project (cve.mitre.org)
        has assigned the name CVE-2005-2929 to this issue.


2. Vulnerable Supported Versions

        System                          Binaries
        ----------------------------------------------------------------------
        OpenServer 5.0.7                /usr/bin/lynx
        OpenServer 6.0.0                /usr/bin/lynx


3. Solution

        The proper solution is to install the latest packages.


4. OpenServer 5.0.7

        4.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.7


    4.2 Verification

        MD5 (p533159.507_vol.tar) = f86e8cb4941d567eedfd0ce761f890b3

        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:

        1) Download p533159.507_vol.tar file to a directory.

        2) Extract VOL* files.

           # tar xvf p533159.507_vol.tar

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


5. OpenServer 6.0.0

        5.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.7


    5.2 Verification

        MD5 (p533159.600_vol.tar) = 8819b849a7463563a50e9575beb15755

        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 p533159.600_vol.tar file to a directory.

        2) Extract VOL* files.

           # tar xvf p533159.600_vol.tar

        3) 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=CVE-2005-2929
                http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3120
                
http://lists.grok.org.uk/pipermail/full-disclosure/2005-October/038019.html
                http://secunia.com/advisories/17216
                http://securitytracker.com/id?1015065
                http://securitytracker.com/id?1015195
                
http://www.idefense.com/application/poi/display?id=338&type=vulnerabilities
                http://www.securityfocus.com/bid/15395

        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 fz533159 fz533314.


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 Ulf Harnhammar for reporting the NNTP
        buffer overflow vulnerability.

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