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Insufficient data authenticity validation - Front bypass

Description​

The credentials policy present in the system warns that these cannot be consecutive and/or repeated numbers, however this validation is only done in the front end of the application, so it is possible to modify the password from the same request and assign a key that goes against the policies.

Impact​

Bypass security policies assigned for user keys.

Recommendation​

The key creation policy must be validated on both the front and back ends of the application.

Threat​

Attacker without credentials from the Internet.

Expected Remediation Time​

⌚ 60 minutes.

Score​

Default score using CVSS 3.1. It may change depending on the context of the vulnerability.

Base​

  • Attack vector: N
  • Attack complexity: L
  • Privileges required: N
  • User interaction: N
  • Scope: U
  • Confidentiality: N
  • Integrity: L
  • Availability: N

Temporal​

  • Exploit code madurity: X
  • Remediation level: X
  • Report confidence: X

Result​

  • Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:X/RL:X/RC:X
  • Score:
    • Base: 5.3
    • Temporal: 5.3
  • Severity:
    • Base: Medium
    • Temporal: Medium

Code Examples​

Compliant code​

The application validates user credentials on the back end

public static boolean isValidPassword(String password,String regex){
  Pattern pattern = Pattern.compile(regex);
  Matcher matcher = pattern.matcher(password);
  return matcher.matches();
}

Non compliant code​

The application does not validate credentials on the back end

public void createUser(user) throws Exception {
  VOUserDetails u = createUniqueUser();
  u.setName(user.name);
  u.setPassword(user.password)
  is.createUser(u, Arrays.asList(UserRoleType.USER), null);
}

Requirements​

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