CWE-283 Base Draft

Unverified Ownership

This vulnerability occurs when an application fails to confirm that a user has legitimate ownership rights to a sensitive resource before allowing them to perform actions on it.

Definition

What is CWE-283?

This vulnerability occurs when an application fails to confirm that a user has legitimate ownership rights to a sensitive resource before allowing them to perform actions on it.
At its core, this flaw is about broken authorization. The application might check if a user is authenticated but then skips the crucial second step: verifying that the specific data or function they're trying to access actually belongs to them. This often happens when developers use an identifier from the client (like an ID in a URL, form field, or cookie) to directly fetch or modify a database record without first checking if the current session is authorized for that exact record. Exploiting this weakness is a primary goal for attackers, leading directly to data breaches and privilege escalation. For example, by simply changing a number in a URL parameter, an attacker could view another user's private messages, financial details, or administrative panels. To prevent this, every single request for a user-specific resource must be validated against the current session's ownership rights, ensuring the user is only ever acting upon resources they truly own.
Real-world impact

Real-world CVEs caused by CWE-283

  • CVE-2001-0178

    Program does not verify the owner of a UNIX socket that is used for sending a password.

  • CVE-2004-2012

    Owner of special device not checked, allowing root.

How attackers exploit it

Step-by-step attacker path

  1. 1

    This function is part of a privileged program that takes input from users with potentially lower privileges.

  2. 2

    This code does not confirm that the process to be killed is owned by the requesting user, thus allowing an attacker to kill arbitrary processes.

  3. 3

    This function remedies the problem by checking the owner of the process before killing it:

Vulnerable code example

Vulnerable Python

This function is part of a privileged program that takes input from users with potentially lower privileges.

Vulnerable Python 
def killProcess(processID):
  	os.kill(processID, signal.SIGKILL)
Secure code example

Secure Python

This function remedies the problem by checking the owner of the process before killing it:

Secure Python 
def killProcess(processID):
  		user = getCurrentUser()
```
#Check process owner against requesting user* 
  		if getProcessOwner(processID) == user:
  		```
  			os.kill(processID, signal.SIGKILL)
  			return
  		else:
  			print("You cannot kill a process you don't own")
  			return
What changed: the unsafe sink is replaced (or the input is validated/escaped) so the same payload no longer triggers the weakness.
Prevention checklist

How to prevent CWE-283

  • Architecture and Design / Operation Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.
  • Architecture and Design Consider following the principle of separation of privilege. Require multiple conditions to be met before permitting access to a system resource.
Detection signals

How to detect CWE-283

SAST High

Run static analysis (SAST) on the codebase looking for the unsafe pattern in the data flow.

DAST Moderate

Run dynamic application security testing against the live endpoint.

Runtime Moderate

Watch runtime logs for unusual exception traces, malformed input, or authorization bypass attempts.

Code review Moderate

Code review: flag any new code that handles input from this surface without using the validated framework helpers.

Plexicus auto-fix

Plexicus auto-detects CWE-283 and opens a fix PR in under 60 seconds.

Codex Remedium scans every commit, identifies this exact weakness, and ships a reviewer-ready pull request with the patch. No tickets. No hand-offs.

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Frequently asked questions

Frequently asked questions

What is CWE-283?

This vulnerability occurs when an application fails to confirm that a user has legitimate ownership rights to a sensitive resource before allowing them to perform actions on it.

How serious is CWE-283?

MITRE has not published a likelihood-of-exploit rating for this weakness. Treat it as medium-impact until your threat model proves otherwise.

What languages or platforms are affected by CWE-283?

MITRE has not specified affected platforms for this CWE — it can apply across most application stacks.

How can I prevent CWE-283?

Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software. Consider following the principle of separation of privilege. Require multiple conditions to be met before permitting access to a system resource.

How does Plexicus detect and fix CWE-283?

Plexicus's SAST engine matches the data-flow signature for CWE-283 on every commit. When a match is found, our Codex Remedium agent opens a fix PR with the corrected code, tests, and a one-line summary for the reviewer.

Where can I learn more about CWE-283?

MITRE publishes the canonical definition at https://cwe.mitre.org/data/definitions/283.html. You can also reference OWASP and NIST documentation for adjacent guidance.

Related weaknesses

Weaknesses related to CWE-283

CWE-282 Parent

Improper Ownership Management

This vulnerability occurs when a system incorrectly assigns or fails to verify which user or process rightfully controls a specific object…

CWE-708 Sibling

Incorrect Ownership Assignment

This vulnerability occurs when a system grants ownership of a resource to an entity that should not have that level of control, placing it…

Resources

Further reading

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