COMMON ATTACK PATTERN ENUMERATION AND CLASSIFICATIONMITRE canlı kaydı

CAPEC-230

Serialized Data with Nested Payloads

Applications often need to transform data in and out of a data format (e.g., XML and YAML) by using a parser. It may be possible for an adversary to inject data that may have an adverse effect on the parser when it is being processed. Many data format languages allow the definition of macro-like structures that can be used to simplify the creation of complex structures. By nesting these structures, causing the data to be repeatedly substituted, an adversary can cause the parser to consume more resources while processing, causing excessive memory consumption and CPU utilization.

Soyutlama

Standard

Tipik ciddiyet

High

Saldırı ihtimali

Medium

Saldırıyı anla

Bu saldırı kalıbı nedir?

Applications often need to transform data in and out of a data format (e.g., XML and YAML) by using a parser. It may be possible for an adversary to inject data that may have an adverse effect on the parser when it is being processed. Many data format languages allow the definition of macro-like structures that can be used to simplify the creation of complex structures. By nesting these structures, causing the data to be repeatedly substituted, an adversary can cause the parser to consume more resources while processing, causing excessive memory consumption and CPU utilization.

Genişletilmiş açıklama

An adversary's goal is to leverage parser failure to their advantage. In most cases this type of an attack will result in a Denial of Service due to an application becoming unstable, freezing, or crashing. However it may be possible to cause a crash resulting in arbitrary code execution, leading to a jump from the data plane to the control plane [ REF-89 ]. This attack is most closely associated with web services using SOAP or a Rest API, because remote service requesters can post malicious payloads to the service provider. The main weakness is that the service provider generally must inspect, parse, and validate the messages to determine routing, workflow, security considerations, and so on. It is exactly these inspection, parsing, and validation routines that this attack targets. This attack exploits the loosely coupled nature of web services, where the service provider has little to no control over the service requester and any messages the service requester sends.

Uygulama akışı

Saldırı adım adım nasıl ilerler?

1

Explore

Attack step

An adversary determines the input data stream that is being processed by a data parser that supports using substitution on the victim's side.
2

Exploit

Attack step

An adversary crafts input data that may have an adverse effect on the operation of the parser when the data is parsed on the victim's system.

Gereksinimler

Saldırının gerçekleşmesi için ne gerekir?

Ön koşullar

  • An application's user-controllable data is expressed in a language that supports subsitution.
  • An application does not perform sufficient validation to ensure that user-controllable data is not malicious.

Gerekli beceri

MITRE kaydında belirtilmemiş.

Gerekli kaynak

MITRE kaydında belirtilmemiş.

Tespit

Saldırının göstergeleri nelerdir?

Bad data is passed to the data parser (possibly repeatedly), possibly making it crash or execute arbitrary code.

Etki

Başarılı saldırı neye yol açar?

Resource Consumption

Etkilenen alanlar: Availability

Read Data

Etkilenen alanlar: Confidentiality

Execute Unauthorized Commands

Etkilenen alanlar: Confidentiality, Integrity, Availability

Gain Privileges

Etkilenen alanlar: Confidentiality, Access Control, Authorization

Savunma

Nasıl önlenir ve etkisi azaltılır?

1
Carefully validate and sanitize all user-controllable data prior to passing it to the data parser routine. Ensure that the resultant data is safe to pass to the data parser.
2
Perform validation on canonical data.
3
Pick a robust implementation of the data parser.