Hidden fields manipulation
Description
It is possible to modify fields that are invisible to the regular user and cause undesired behaviors in the application.
Impact
Force unwanted actions in the application modifying resources which can not be accessible by user.
Recommendation
Send only fields that require users inputs in the requests, and control the rest from the server.
Threat
Authenticated attacker 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: A
- Attack complexity: H
- Privileges required: N
- User interaction: R
- 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:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N/E:X/RL:X/RC:X
- Score:
- Base: 2.6
- Temporal: 2.6
- Severity:
- Base: Low
- Temporal: Low
Code Examples
Compliant code
Avoid using hidden input fields without handling them from the server side
<form action="/action_page.php">
<h1>Login Form</h1>
<div class="container">
<label for="uname"><strong>Username</strong></label>
<input type="text" placeholder="Enter Username" name="uname" required>
<label for="psw"><strong>Password</strong></label>
<input type="password" placeholder="Enter Password" name="psw" required>
</div>
<button type="submit">Login</button>
</form>
Non compliant code
There are hidden fields in the application forms that could be manipulated
<form action="/action_page.php">
<h1>Login Form</h1>
<div class="container">
<label for="uname"><strong>Username</strong></label>
<input type="text" placeholder="Enter Username" name="uname" required>
<label for="psw"><strong>Password</strong></label>
<input type="password" placeholder="Enter Password" name="psw" required>
// Using hidden fields
<input type="hidden" id="location" name="location" value="">
</div>
<button type="submit">Login</button>
</form>
Requirements
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