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hackeroneXcheaterH1:840598
HistoryApr 05, 2020 - 3:03 p.m.

Nextcloud: Possible denial of service when entering a loooong password

2020-04-0515:03:50
xcheater
hackerone.com
$100
14

EPSS

0.001

Percentile

46.4%

You can create a very long password until you get the last user to put and aries or [DoS].
*Normally passwords have 8-10-24 digits.
By sending a very long password (1.000.000 characters) Usually this problem is caused by a vulnerable password hashing implementation. When a long password is sent, the password hashing process will result in CPU and memory exhaustion.

**Remediation
The password hashing implementation must be fixed to limit the maximum length of accepted passwords.

**step to reproduce:-
1.go to the link https://nextcloud.com/signup/
2.try to signup there whatever email id you want then
3. on password field try to input many digits, hence you have generated it.

**I have tried
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Impact

it’s possible to cause a denial a service attack on the server. This may lead to the website becoming unavailable or unresponsive.

EPSS

0.001

Percentile

46.4%