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Advisory: Stored XSS-Vulnerabilities in MyBB v. 1.8.3 Advisory ID: SROEADV-2015-15 Author: Steffen Rösemann Affected Software: MyBB v. 1.8.3 Vendor URL: http://www.mybb.com Vendor Status: patched CVE-ID: - ========================== Vulnerability Description: ========================== MyBB v. 1.8.3 suffers from multiple stored XSS-vulnerabilities in the administrative backend. ================== Technical Details: ================== The stored XSS-vulnerabilities can be found in different modules in the following locations of a common MyBB installation: ====================== Module "config-attachment_types" ====================== via form-field MIME-type: http://{TARGET}/admin/index.php?module=config-attachment_types&action=add executed in: e.g. http:// {TARGET}/admin/index.php?module=config-attachment_types =============== Module "config-mycode" =============== via form fields "title" and "short description": http://{TARGET}/admin/index.php?module=config-mycode&action=add executed in: e.g. http://{TARGET}/admin/index.php?module=config-mycode =================== Module "forum-management" =================== via form field "title": http://{TARGET}/admin/index.php?module=forum-management&action=add executed in: e.g. http://{TARGET}/admin/index.php?module=forum ============== Module "user-groups" ============== via form fields "title" and/or "short description": http://{TARGET}/admin/index.php?module=user-groups&action=add executed in: e.g. http://{TARGET}/admin/index.php?module=user-groups ================ Module "style-templates" ================ via form field "name": http://{TARGET}/admin/index.php?module=style-templates&action=add_set executed in: e.g. http://{TARGET}/admin/index.php?module=style-templates ==================================== Module "style-templates" in action "add_template_group" ==================================== via form field "title": http:// {TARGET}/admin/index.php?module=style-templates&action=add_template_group executed in: e.g. http:// {TARGET}/admin/index.php?module=style-templates&sid={TEMPLATES_NUMERIC_ID} ============= Module "tool-tasks" ============= via form field "title": http://{TARGET}/admin/index.php?module=tools-tasks&action=add executed in: e.g. http://{TARGET}/admin/index.php?module=tools-adminlog ================= Module "config-post_icons" ================= via form field "name": http://{TARGET}/admin/index.php?module=config-post_icons&action=add executed in: e.g. http://{TARGET}/admin/index.php?module=tools-adminlog ============= Module "user-titles" ============= via form field "title to assign": http://{TARGET}/admin/index.php?module=user-titles&action=add executed in: e.g. http://{TARGET}/admin/index.php?module=tools-adminlog ================ Module "config-banning" ================ via form field "username": http://{TARGET}/admin/index.php?module=config-banning&type=usernames executed in: e.g. http://{TARGET}/admin/index.php?module=tools-adminlog ========= Solution: ========= Upgrade to v. 1.8.4. ==================== Disclosure Timeline: ==================== 02/03-Feb-2015 – found the vulnerabilities 03-Feb-2015 - informed the developers according to their security issue rules (see [3]) 03-Feb-2015 – release date of this security advisory [without technical details] 03-Feb-2015 - vendor replied, issues will be patched 15-Feb-2015 - vendor released patch v. 1.8.4 (see [4]) 19-Feb-2015 - release date of this security advisory 19-Feb-2015 - send to FullDisclosure ======== Credits: ======== Vulnerability found and advisory written by Steffen Rösemann. =========== References: =========== [1] http://www.mybb.com [2] http://sroesemann.blogspot.de/2015/02/sroeadv-2015-15.html [3] http://www.mybb.com/get-involved/security/ [4] http://blog.mybb.com/2015/02/15/mybb-1-8-4-released-feature-update-security-maintenance-release/ Source