Improper Ownership Management

Description

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

Extended Description

At its core, this flaw is about broken trust in access control. It happens when software doesn't properly track or validate the true 'owner' of a file, memory block, database record, or system object. This can allow unauthorized users to delete, modify, or access resources they shouldn't, simply because the system believes they own them. Think of it as handing your house keys to a stranger because a faulty system incorrectly listed them as the homeowner. For developers, the main risk is that operations which should be restricted to a resource's creator—like deletion or permission changes—become available to others. To prevent this, always explicitly validate ownership through a trusted authority (like a kernel or central service) before performing sensitive actions. Never rely on unverified user-supplied claims or transient identifiers that can be forged or reused. Implement clear, centralized ownership lifecycle management for all critical resources.

Common Consequences 1

Scope: Access Control

Impact: Gain Privileges or Assume Identity

Detection Methods 1

Automated Static AnalysisHigh

Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)

Potential Mitigations 1

Phase: Architecture and DesignOperation

Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.

Demonstrative Examples 1

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

Code Example:Bad
Python
python

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.

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

Code Example:

Good

Python

python

#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

Observed Examples 1

CVE-1999-1125Program runs setuid root but relies on a configuration file owned by a non-root user.

Applicable Platforms

Languages:

Not Language-Specific : Undetermined

Modes of Introduction

Architecture and Design

Related Attack Patterns

Affected Resources

File or Directory

Related Weaknesses

ChildOf:

Improper Access Control (CWE-284)

Taxonomy Mapping

PLOVER

Notes

MaintenanceThe relationships between privileges, permissions, and actors (e.g. users and groups) need further refinement within the Research view. One complication is that these concepts apply to two different pillars, related to control of resources (Improper Control of a Resource Through its Lifetime) and protection mechanism failures (Protection Mechanism Failure).