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CWE-645 - Overly Restrictive Account Lockout Mechanism

CWE-645 High

  • Abstraction:
  • Base
  • Structure:
  • Simple
  • Status:
  • Incomplete
Weakness Name

Overly Restrictive Account Lockout Mechanism

Description

The product contains an account lockout protection mechanism, but the mechanism is too restrictive and can be triggered too easily, which allows attackers to deny service to legitimate users by causing their accounts to be locked out.

Account lockout is a security feature often present in applications as a countermeasure to the brute force attack on the password based authentication mechanism of the system. After a certain number of failed login attempts, the users' account may be disabled for a certain period of time or until it is unlocked by an administrator. Other security events may also possibly trigger account lockout. However, an attacker may use this very security feature to deny service to legitimate system users. It is therefore important to ensure that the account lockout security mechanism is not overly restrictive.

Common Consequences

Scope: Availability

Impact: DoS: Resource Consumption (Other)

Notes: Users could be locked out of accounts.

Related Weaknesses
  • Release Date:
  • 2008-01-30
  • Latest Modification Date:
  • 2023-06-29

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