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Home > CAPEC List > CAPEC-261: Fuzzing for garnering other adjacent user/sensitive data (Version 3.7)  

CAPEC-261: Fuzzing for garnering other adjacent user/sensitive data

Attack Pattern ID: 261
Abstraction: Detailed
Status: Draft
Presentation Filter:
+ Description
An adversary who is authorized to send queries to a target sends variants of expected queries in the hope that these modified queries might return information (directly or indirectly through error logs) beyond what the expected set of queries should provide.
+ Extended Description

Many client applications use specific query templates when interacting with a server and often automatically fill in specific fields or attributes. If the server does not verify that the query matches one of the expected templates, an adversary who is allowed to send normal queries could modify their query to try to return additional information. The adversary may not know the names of fields to request or how other modifications will affect the server response, but by attempting multiple plausible variants, they might eventually trigger a server response that divulges sensitive information. Other possible outcomes include server crashes and resource consumption if the unexpected queries cause the server to enter an unstable state or perform excessive computation.

+ 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.54Query System for Information
Section HelpThis table shows the views that this attack pattern belongs to and top level categories within that view.
+ Execution Flow
  1. Observe communication and inputs: The fuzzing adversary observes the target system looking for inputs and communications between modules, subsystems, or systems.

    Network sniffing. Using a network sniffer such as wireshark, the adversary observes communications into and out of the target system.
    Monitor API execution. Using a tool such as ktrace, strace, APISpy, or another debugging tool, the adversary observes the system calls and API calls that are made by the target system, and the nature of their parameters.
    Observe inputs using web inspection tools (OWASP's WebScarab, Paros, TamperData, TamperIE, etc.)
  1. Generate fuzzed inputs: Given a fuzzing tool, a target input or protocol, and limits on time, complexity, and input variety, generate a list of inputs to try. Although fuzzing is random, it is not exhaustive. Parameters like length, composition, and how many variations to try are important to get the most cost-effective impact from the fuzzer.

    Boundary cases. Generate fuzz inputs that attack boundary cases of protocol fields, inputs, or other communications limits. Examples include 0xff and 0x00 for single-byte inputs. In binary situations, approach each bit of an individual field with on and off (e.g., 0x80).
    Attempt arguments to system calls or APIs. The variations include payloads that, if they were successful, could lead to a compromise on the system.
  2. Observe the outcome: Observe the outputs to the inputs fed into the system by fuzzers and see if there are any log or error messages that either provide user/sensitive data or give information about an expected template that could be used to produce this data.

  1. Craft exploit payloads: If the logs did not reveal any user/sensitive data, an adversary will attempt to make the fuzzing inputs form to an expected template

    Create variants of expected templates that request additional information
    Create variants that exclude limiting clauses
    Create variants that alter fields taht identify the requester in order to subvert access controls
    Repeat different fuzzing variants until sensitive information is divulged
+ Prerequisites
The server must assume that the queries it receives follow specific templates and/or have fields or attributes that follow specific procedures. The server must process queries that it receives without adequately checking or sanitizing queries to ensure they follow these templates.
+ Resources Required
The attacker must have sufficient privileges to send queries to the targeted server. A normal client might limit the nature of these queries, so the attacker must either have a modified client or their own application which allows them to modify the expected queries.
+ Example Instances

A client that queries an employee database might have templates such that the user only supplies the target's name and the template dictates the fields to be returned (location, position in the company, phone number, etc.). If the server does not verify that the query matches one of the expected templates, an attacker who is allowed to send normal queries could modify their query to try to return additional information. For this example, additional information might include social security numbers or salaries.

+ Content History
Submission DateSubmitterOrganization
2014-06-23CAPEC Content TeamThe MITRE Corporation
Modification DateModifierOrganization
2015-11-09CAPEC Content TeamThe MITRE Corporation
Updated Related_Attack_Patterns
2019-04-04CAPEC Content TeamThe MITRE Corporation
Updated Related_Weaknesses
2020-12-17CAPEC Content TeamThe MITRE Corporation
Updated Description, Example_Instances
2021-10-21CAPEC Content TeamThe MITRE Corporation
Updated Description, Execution_Flow
2022-02-22CAPEC Content TeamThe MITRE Corporation
Updated Description, Extended_Description
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Page Last Updated or Reviewed: October 21, 2021