Disclosure of h1 challenges name through the calendar
This issue took 0 Days and 0 hours to triage and 0 Days and 4 hours to resolve once triaged.
Discovered by rijalrojan on Security
It seems like the Calendar somehow grabs the name of the target for a h1 challenge even though the target name is not public.
h1challengesdo not disclose the name of the target until the time it starts. For example for this challenge: █████ the name of the target is not disclosed anywhere and the page looks something like this:
However, once we import the calendar on something like Google calendar, it shows the name of the target:
This is super useful specially because sometimes program run multiple challenges in short period of time. For example, knowing more about this challenge (the name of the target), a hacker can hack and hodl bugs until the program starts.
Steps To Reproduce
- Add yourself to challenge like the one linked above.
- Link/update your Google Calendar with the hackerone events calendar.
- Find the date in the calendar when the challenge is set to start and you can see the name there.
Disclosure of h1c-* challenge targets.