{"id":61,"date":"2020-09-18T23:03:34","date_gmt":"2020-09-18T17:33:34","guid":{"rendered":"https:\/\/www.pethuraj.com\/blog\/?p=61"},"modified":"2020-09-19T12:12:17","modified_gmt":"2020-09-19T06:42:17","slug":"bigbasket-bug-bounty-writeup","status":"publish","type":"post","link":"https:\/\/www.pethuraj.com\/blog\/bigbasket-bug-bounty-writeup\/","title":{"rendered":"Bigbasket Bug Bounty Writeup"},"content":{"rendered":"\n<p>This is the writeup about the Bigbasket Open redirect bypass vulnerability.<\/p>\n\n\n\n<p>I tested Bigbasket portal for security loopholes and I picked the main domain as the target.<\/p>\n\n\n\n<p>I fuzzed the domain with tools like <a data-type=\"URL\" data-id=\"https:\/\/pypi.org\/project\/wfuzz\" rel=\"noreferrer noopener\" href=\"https:\/\/pypi.org\/project\/wfuzz\" target=\"_blank\">wfuzz<\/a>, <a href=\"https:\/\/github.com\/ffuf\/ffuf\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">ffuf<\/a>, dirb and using Burp&#8217;s Content discovery.<\/p>\n\n\n\n<p>While the fuzz was in progress, I noticed the <strong>next=<\/strong> parameter containing a URL, which means I can try <strong>Open Redirect<\/strong> \/ <strong>XSS<\/strong> \/ <strong>SSRF<\/strong> issues on this parameter.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"883\" height=\"476\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Original-Login.png\" alt=\"\" class=\"wp-image-103\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Original-Login.png 883w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Original-Login-300x162.png 300w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Original-Login-768x414.png 768w\" sizes=\"(max-width: 883px) 100vw, 883px\" \/><\/figure>\n\n\n\n<p>I tried open redirection by replacing my domain.<\/p>\n\n\n\n<p>I got <span class=\"has-inline-color has-vivid-red-color\">Access Denied error<\/span> which means there is a validation for the domain in the next= parameter.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"372\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/URL-Blocked-1024x372.png\" alt=\"\" class=\"wp-image-64\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/URL-Blocked-1024x372.png 1024w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/URL-Blocked-300x109.png 300w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/URL-Blocked-768x279.png 768w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/URL-Blocked.png 1045w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n\n<p>So as next step I encoded my domain using online HTML encoder.<\/p>\n\n\n\n<p>I URL encoded my domain using this <a rel=\"noreferrer noopener\" href=\"https:\/\/meyerweb.com\/eric\/tools\/dencoder\/\" data-type=\"URL\" data-id=\"https:\/\/meyerweb.com\/eric\/tools\/dencoder\/\" target=\"_blank\">Online tool<\/a>.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Url-encode.png\" alt=\"\" class=\"wp-image-65\" width=\"399\" height=\"225\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Url-encode.png 824w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Url-encode-300x169.png 300w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Url-encode-768x433.png 768w\" sizes=\"(max-width: 399px) 100vw, 399px\" \/><figcaption>Before URL encoding<\/figcaption><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/URL-encoded.png\" alt=\"\" class=\"wp-image-66\" width=\"399\" height=\"224\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/URL-encoded.png 829w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/URL-encoded-300x169.png 300w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/URL-encoded-768x433.png 768w\" sizes=\"(max-width: 399px) 100vw, 399px\" \/><figcaption>After URL encoding<\/figcaption><\/figure><\/div>\n\n\n\n<p>Now I used the URL encoded payload and inserted it on the <strong>next=<\/strong> parameter. <\/p>\n\n\n\n<p>After I enter the credentials, and click Login &#8211; it redirects to my domain which is a successful Open redirect vulnerability \ud83c\udf89<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Login.jpg\" alt=\"\" class=\"wp-image-67\" width=\"550\" height=\"281\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Login.jpg 841w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Login-300x153.jpg 300w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Login-768x393.jpg 768w\" sizes=\"(max-width: 550px) 100vw, 550px\" \/><\/figure><\/div>\n\n\n\n<p>Below is the POC video.<\/p>\n\n\n\n<p><strong>POC Video : <\/strong><\/p>\n\n\n\n<figure class=\"wp-block-video aligncenter\"><video height=\"1008\" style=\"aspect-ratio: 1920 \/ 1008;\" width=\"1920\" controls src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/POC-video.mp4\"><\/video><\/figure>\n\n\n\n<p>\ud83d\udcb0 I&#8217;ve been rewarded by their Security team and acknowledged in their Hall of Fame. <\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Acknowledgement-1024x300.jpg\" alt=\"\" class=\"wp-image-76\" width=\"488\" height=\"142\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Acknowledgement-1024x300.jpg 1024w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Acknowledgement-300x88.jpg 300w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Acknowledgement-768x225.jpg 768w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Acknowledgement.jpg 1089w\" sizes=\"(max-width: 488px) 100vw, 488px\" \/><\/figure><\/div>\n\n\n\n<p>Here&#8217;s the <strong>Hall of Fame<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"525\" src=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Bigbasket-Hall-of-Fame-1024x525.png\" alt=\"\" class=\"wp-image-77\" srcset=\"https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Bigbasket-Hall-of-Fame-1024x525.png 1024w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Bigbasket-Hall-of-Fame-300x154.png 300w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Bigbasket-Hall-of-Fame-768x394.png 768w, https:\/\/www.pethuraj.com\/blog\/wp-content\/uploads\/2020\/09\/Bigbasket-Hall-of-Fame.png 1197w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong>Bigbasket Hall of Fame<\/strong> &#8211; <a rel=\"noreferrer noopener\" href=\"https:\/\/tech.bigbasket.com\/security-at-bigbasket\/\" target=\"_blank\">https:\/\/tech.bigbasket.com\/security-at-bigbasket\/<\/a><\/p>\n\n\n\n<p>That&#8217;s it in this write up.<\/p>\n\n\n\n<p>Thank you!<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">You may like<\/h3>\n\n\n<div class=\"pt-cv-wrapper\"><div class=\"pt-cv-view pt-cv-grid pt-cv-colsys\" id=\"pt-cv-view-04dc74cl1b\"><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=\"_blank pt-cv-href-thumbnail pt-cv-thumb-default\" target=\"_blank\" ><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=\"_blank\" target=\"_blank\" >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=\"_blank pt-cv-readmore btn btn-success\" target=\"_blank\">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=\"_blank pt-cv-href-thumbnail pt-cv-thumb-default\" target=\"_blank\" ><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=\"_blank\" target=\"_blank\" >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=\"_blank pt-cv-readmore btn btn-success\" target=\"_blank\">Read More<\/a><\/div><\/div><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>This write up is about Open Redirect bypass vulnerability on Bigbasket.com<\/p>\n","protected":false},"author":1,"featured_media":62,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[4],"class_list":["post-61","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-open-redirect"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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