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FirstBlood-#63 — Open redirect on logout
This issue was discovered on FirstBlood v1
On 2021-05-09, 0xSaltyHash Level 3 reported:
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Summary:
The ?ref= parameter on /drpanel/logout endpoint is vulnerable to open redirect, normally if you try and go to http://firstbloodhackers.com:<PORT>/drpanel/logout.php?ref=https://google.com/ you get redirected to an invalid page so i tried prepending // to the redirect uri and finally i got a redirect to different origin.
POC:
http://firstbloodhackers.com:<PORT>/drpanel/logout.php?ref=//https://google.com/.
P4 Low
Endpoint: /drpanel/logout.php?ref=
Parameter: ref=
Payload: http://firstbloodhackers.com:<PORT>/drpanel/logout.php?ref=//https://google.com/
FirstBlood ID: 1
Vulnerability Type: Open Redirect
There is an open url redirect vulnerability on /logout.php. The code expects it to start with / and does not allow to redirect to external domains but this can be bypassed.