{"id":247,"date":"2021-05-16T13:10:33","date_gmt":"2021-05-16T07:40:33","guid":{"rendered":"https:\/\/www.pethuraj.com\/blog\/?p=247"},"modified":"2021-05-25T19:36:30","modified_gmt":"2021-05-25T14:06:30","slug":"edmodo-bug-bounty-writeup","status":"publish","type":"post","link":"https:\/\/www.pethuraj.com\/blog\/edmodo-bug-bounty-writeup\/","title":{"rendered":"Edmodo Bug Bounty Writeup"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">I found XSS vulnerability on one of Edmodo asset and it was found to be duplicate.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"196\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo1-1024x196.png\" alt=\"\" class=\"wp-image-248\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo1-1024x196.png 1024w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo1-300x57.png 300w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo1-768x147.png 768w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo1.png 1243w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">After my report got duplicated, I decided to bypass the XSS fix and started on the same target https:\/\/snapshot.edmodo.com.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The page looked like this and it has some input fields just like a form creation website.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"620\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo2-1024x620.png\" alt=\"\" class=\"wp-image-251\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo2-1024x620.png 1024w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo2-300x182.png 300w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo2-768x465.png 768w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo2.png 1501w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">I tried the same payload which I reported earlier just to check if it&#8217;s fixed. And it is!<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"123\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo3-1024x123.png\" alt=\"\" class=\"wp-image-252\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo3-1024x123.png 1024w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo3-300x36.png 300w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo3-768x92.png 768w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo3.png 1181w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">There is no popup and also I noticed the basic XSS payloads are being stripped off.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"296\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo4-1024x296.png\" alt=\"\" class=\"wp-image-253\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo4-1024x296.png 1024w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo4-300x87.png 300w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo4-768x222.png 768w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo4.png 1510w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">As you can see above screenshot, the payload didn&#8217;t execute. So I tried to understand the fix and decided to use encoded XSS payloads.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This time I used a base64 payload inside &lt;embed&gt; tag and it is a XSS. <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"697\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo5-1024x697.png\" alt=\"\" class=\"wp-image-254\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo5-1024x697.png 1024w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo5-300x204.png 300w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo5-768x522.png 768w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo5.png 1273w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The payload executed and popped an XSS.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"587\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo6-1024x587.png\" alt=\"\" class=\"wp-image-255\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo6-1024x587.png 1024w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo6-300x172.png 300w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo6-768x440.png 768w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo6-1536x880.png 1536w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo6.png 1686w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">This payload is limited only to Firefox browser as by OWASP.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"702\" height=\"337\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo7.png\" alt=\"\" class=\"wp-image-256\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo7.png 702w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo7-300x144.png 300w\" sizes=\"(max-width: 702px) 100vw, 702px\" \/><figcaption>Refer to the OWASP&#8217;s XSS Filter Evasion cheatsheet for this payload &#8211; https:\/\/owasp.org\/www-community\/xss-filter-evasion-cheatsheet<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">For reporting this vulnerability, Edmodo rewarded me for this vulnerability with exciting goodies.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"367\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo-mail-1024x367.png\" alt=\"\" class=\"wp-image-258\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo-mail-1024x367.png 1024w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo-mail-300x107.png 300w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo-mail-768x275.png 768w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo-mail-1536x550.png 1536w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo-mail-2048x734.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">And after few days I received the swag pack!<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"986\" height=\"1024\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo-swag-986x1024.jpg\" alt=\"\" class=\"wp-image-259\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo-swag-986x1024.jpg 986w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo-swag-289x300.jpg 289w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo-swag-768x797.jpg 768w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2021\/05\/edmodo-swag.jpg 1152w\" sizes=\"(max-width: 986px) 100vw, 986px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Get in touch with me &#8211; <\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/twitter.com\/Pethuraj\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/twitter.com\/Pethuraj<\/a><br><a href=\"https:\/\/www.linkedin.com\/in\/pethu\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.linkedin.com\/in\/pethu\/<\/a><\/p>\n\n\n<div class=\"pt-cv-wrapper\"><div class=\"pt-cv-view pt-cv-grid pt-cv-colsys\" id=\"pt-cv-view-e8c39ddw2b\"><div data-id=\"pt-cv-page-1\" class=\"pt-cv-page\" data-cvc=\"2\"><div class=\"col-md-6 col-sm-6 col-xs-12 pt-cv-content-item pt-cv-1-col\" ><div class='pt-cv-ifield'><a href=\"https:\/\/www.pethuraj.com\/blog\/how-to-use-burp-suite-like-a-pro-part-2\/\" class=\"_self pt-cv-href-thumbnail pt-cv-thumb-default\" target=\"_self\" ><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"150\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2025\/01\/Use-Burp-Suite-like-a-PRO-Part-2-300x150.png\" class=\"pt-cv-thumbnail\" alt=\"\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2025\/01\/Use-Burp-Suite-like-a-PRO-Part-2-300x150.png 300w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2025\/01\/Use-Burp-Suite-like-a-PRO-Part-2-768x384.png 768w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2025\/01\/Use-Burp-Suite-like-a-PRO-Part-2.png 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a>\n<h4 class=\"pt-cv-title\"><a href=\"https:\/\/www.pethuraj.com\/blog\/how-to-use-burp-suite-like-a-pro-part-2\/\" class=\"_self\" target=\"_self\" >How to use Burp Suite Like a PRO? PART \u2013 2<\/a><\/h4>\n<div class=\"pt-cv-content\">Ready to level up your Burp Suite skills? In part 2, I've compiled some awesome tips and tricks to help ...<br \/><div class=\"pt-cv-rmwrap\"><a href=\"https:\/\/www.pethuraj.com\/blog\/how-to-use-burp-suite-like-a-pro-part-2\/\" class=\"_self pt-cv-readmore btn btn-success\" target=\"_self\">Read More<\/a><\/div><\/div><\/div><\/div>\n<div class=\"col-md-6 col-sm-6 col-xs-12 pt-cv-content-item pt-cv-1-col\" ><div class='pt-cv-ifield'><a href=\"https:\/\/www.pethuraj.com\/blog\/use-burpsuite-like-a-pro-part-1\/\" class=\"_self pt-cv-href-thumbnail pt-cv-thumb-default\" target=\"_self\" ><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"150\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2022\/07\/Mastering-Burp-suite-300x150.png\" class=\"pt-cv-thumbnail\" alt=\"burp suite advanced tutorials\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2022\/07\/Mastering-Burp-suite-300x150.png 300w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2022\/07\/Mastering-Burp-suite-768x384.png 768w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2022\/07\/Mastering-Burp-suite.png 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a>\n<h4 class=\"pt-cv-title\"><a href=\"https:\/\/www.pethuraj.com\/blog\/use-burpsuite-like-a-pro-part-1\/\" class=\"_self\" target=\"_self\" >How to use Burp Suite Like a PRO? PART &#8211; 1<\/a><\/h4>\n<div class=\"pt-cv-content\">This blog series is an advanced tutorial of the popular web application security and penetration testing tool Burp Suite,\u00a0to help ...<br \/><div class=\"pt-cv-rmwrap\"><a href=\"https:\/\/www.pethuraj.com\/blog\/use-burpsuite-like-a-pro-part-1\/\" class=\"_self pt-cv-readmore btn btn-success\" target=\"_self\">Read More<\/a><\/div><\/div><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>This is a writeup about the XSS vulnerability which I found on their portal.<\/p>\n","protected":false},"author":1,"featured_media":249,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[3],"class_list":["post-247","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-xss","tag-xss"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Edmodo Bug Bounty Writeup - Pethuraj&#039;s Blog<\/title>\n<meta name=\"description\" content=\"This blog is about the XSS vulnerability writeup on the Edmodo platform. 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