Unverified Ownership

The software does not properly verify that a critical resource is owned by the proper entity.


Demonstrations

The following examples help to illustrate the nature of this weakness and describe methods or techniques which can be used to mitigate the risk.

Note that the examples here are by no means exhaustive and any given weakness may have many subtle varieties, each of which may require different detection methods or runtime controls.

Example One

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

def killProcess(processID):
  os.kill(processID, signal.SIGKILL)

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:

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

See Also

Authorize Actors

Weaknesses in this category are related to the design and architecture of a system's authorization components. Frequently these deal with enforcing that agents have th...

SFP Secondary Cluster: Access Management

This category identifies Software Fault Patterns (SFPs) within the Access Management cluster.

Business Logic Errors

Weaknesses in this category identify some of the underlying problems that commonly allow attackers to manipulate the business logic of an application. Errors in busine...

Comprehensive CWE Dictionary

This view (slice) covers all the elements in CWE.

Weaknesses without Software Fault Patterns

CWE identifiers in this view are weaknesses that do not have associated Software Fault Patterns (SFPs), as covered by the CWE-888 view. As such, they represent gaps in...

CWE Cross-section

This view contains a selection of weaknesses that represent the variety of weaknesses that are captured in CWE, at a level of abstraction that is likely to be useful t...


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