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Open redirect on xxx.xxxxxxxxxxxx.xxx

Hi,

I would like to report an open redirect issue on xxx.xxxxxxxxxxxx.xxx.

Description

An attacker can redirect a user to any external website using the parameter yyyy The parameter seems to miss sanitization, some urls don't work but some other do.

http://google.com doesn't work http://google.com/ doesn't work http:/google.com works http:google.com works

Steps to Reproduce

Visit the following url: https://xxx.xxxxxxxxxxxx.xxx/.....
This will redirect you to http://google.com

Browsers Verified In:

  • Firefox 49.0.2, Ubuntu 16.04

PoC

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Risk

By modifying untrusted URL input to a malicious site, an attacker may successfully launch a phishing scam and steal user credentials. Because the server name in the modified link is identical to the original site, phishing attempts may have a more trustworthy appearance.

See also

https://www.owasp.org/index.php/Unvalidated_Redirects_and_Forwards_Cheat_Sheet

Best regards,

Gwen