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Home > CAPEC List > CAPEC-208: Removing/short-circuiting 'Purse' logic: removing/mutating 'cash' decrements (Version 3.7)  

CAPEC-208: Removing/short-circuiting 'Purse' logic: removing/mutating 'cash' decrements

Attack Pattern ID: 208
Abstraction: Detailed
Status: Draft
Presentation Filter:
+ Description
An attacker removes or modifies the logic on a client associated with monetary calculations resulting in incorrect information being sent to the server. A server may rely on a client to correctly compute monetary information. For example, a server might supply a price for an item and then rely on the client to correctly compute the total cost of a purchase given the number of items the user is buying. If the attacker can remove or modify the logic that controls these calculations, they can return incorrect values to the server. The attacker can use this to make purchases for a fraction of the legitimate cost or otherwise avoid correct billing for activities.
+ Typical Severity


+ Relationships
Section HelpThis table shows the other attack patterns and high level categories that are related to this attack pattern. These relationships are defined as ChildOf and ParentOf, and give insight to similar items that may exist at higher and lower levels of abstraction. In addition, relationships such as CanFollow, PeerOf, and CanAlsoBe are defined to show similar attack patterns that the user may want to explore.
ChildOfStandard Attack PatternStandard Attack Pattern - A standard level attack pattern in CAPEC is focused on a specific methodology or technique used in an attack. It is often seen as a singular piece of a fully executed attack. A standard attack pattern is meant to provide sufficient details to understand the specific technique and how it attempts to accomplish a desired goal. A standard level attack pattern is a specific type of a more abstract meta level attack pattern.207Removing Important Client Functionality
Section HelpThis table shows the views that this attack pattern belongs to and top level categories within that view.
+ Prerequisites
The targeted server must rely on the client to correctly perform monetary calculations and must fail to detect errors in these calculations.
+ Resources Required
The attacker must have access to the client for the targeted service (this step is trivial for most web-based services). The attacker must also be able to reverse engineer the client in order to locate and modify the client's purse logic. Reverse engineering tools would be necessary for this.
+ Content History
Submission DateSubmitterOrganization
2014-06-23CAPEC Content TeamThe MITRE Corporation
Modification DateModifierOrganization
2015-12-07CAPEC Content TeamThe MITRE Corporation
Updated Related_Attack_Patterns
2017-08-04CAPEC Content TeamThe MITRE Corporation
Updated Resources_Required
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Page Last Updated or Reviewed: October 21, 2021