This is the writeup about the Bigbasket Open redirect bypass vulnerability.
I tested Bigbasket portal for security loopholes and I picked the main domain as the target.
While the fuzz was in progress, I noticed the next= parameter containing a URL, which means I can try Open Redirect / XSS / SSRF issues on this parameter.
I tried open redirection by replacing my domain.
I got Access Denied error which means there is a validation for the domain in the next= parameter.
So as next step I encoded my domain using online HTML encoder.
I URL encoded my domain using this Online tool.
Now I used the URL encoded payload and inserted it on the next= parameter.
After I enter the credentials, and click Login – it redirects to my domain which is a successful Open redirect vulnerability 🎉
Below is the POC video.
POC Video :
💰 I’ve been rewarded by their Security team and acknowledged in their Hall of Fame.
Here’s the Hall of Fame.
Bigbasket Hall of Fame – https://tech.bigbasket.com/security-at-bigbasket/
That’s it in this write up.
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