CWE-354 Base Rascunho Medium likelihood

Improper Validation of Integrity Check Value

This vulnerability occurs when software fails to properly check the integrity of data by validating its checksum or hash value. Without this verification, the application cannot reliably detect if…

Definição

What is CWE-354?

This vulnerability occurs when software fails to properly check the integrity of data by validating its checksum or hash value. Without this verification, the application cannot reliably detect if information has been altered, corrupted, or tampered with during storage or transmission.
Ignoring checksum validation introduces a preventable security gap. Most protocols specify a standard algorithm for generating these integrity values. The developer's responsibility is to implement that same calculation and compare the result against the provided checksum—a straightforward process that acts as a critical first line of defense against data corruption and malicious manipulation. Failure to perform this match correctly can have severe consequences. Since the application trusts the data as authentic, it may process malicious instructions, load corrupted files, or make decisions based on falsified information. This simple oversight can escalate into system compromise, data loss, or unstable behavior, making proper checksum verification a fundamental requirement for secure data handling.
Impacto no mundo real

Real-world CVEs caused by CWE-354

Ainda não há referências CVE públicas associadas a este CWE no catálogo da MITRE.

Como os atacantes a exploram

Trajeto do atacante passo a passo

  1. 1

    Identificar um caminho de código que trata input não confiável sem validação.

  2. 2

    Criar um payload que explora o comportamento inseguro — injeção, traversal, overflow ou abuso de lógica.

  3. 3

    Entregar o payload através de um pedido normal e observar a reação da aplicação.

  4. 4

    Iterar até que a resposta exponha dados, execute código do atacante ou escale privilégios.

Exemplo de código vulnerável

Vulnerable C

The following example demonstrates the weakness.

Vulnerável C
sd = socket(AF_INET, SOCK_DGRAM, 0); serv.sin_family = AF_INET;
  serv.sin_addr.s_addr = htonl(INADDR_ANY);
  servr.sin_port = htons(1008);
  bind(sd, (struct sockaddr *) & serv, sizeof(serv));
  while (1) {
  		memset(msg, 0x0, MAX_MSG);
  		clilen = sizeof(cli);
  		if (inet_ntoa(cli.sin_addr)==...) n = recvfrom(sd, msg, MAX_MSG, 0, (struct sockaddr *) & cli, &clilen);
  }
Exemplo de código seguro

Secure pseudo

Seguro pseudo
// Validate, sanitize, or use a safe API before reaching the sink.
function handleRequest(input) {
  const safe = validateAndEscape(input);
  return executeWithGuards(safe);
}
What changed: the unsafe sink is replaced (or the input is validated/escaped) so the same payload no longer triggers the weakness.
Lista de verificação de prevenção

How to prevent CWE-354

  • Implementation Ensure that the checksums present in messages are properly checked in accordance with the protocol specification before they are parsed and used.
Sinais de deteção

How to detect CWE-354

SAST High

Executar análise estática (SAST) na base de código à procura do padrão inseguro no fluxo de dados.

DAST Moderate

Executar testes dinâmicos de segurança de aplicações (DAST) contra o endpoint em execução.

Runtime Moderate

Monitorizar os registos em tempo de execução para traços de exceção invulgares, input malformado ou tentativas de contornar a autorização.

Code review Moderate

Revisão de código: sinalizar qualquer novo código que trate input desta superfície sem usar os ajudantes validados do framework.

CWE-354

Don't catalog this weakness. Prove it's reachable.

Plexicus turns CWE catalogs into evidence: every CWE-pattern is matched against your real code graph, reach is proven on a sandbox clone, and verified findings ship as reviewed PRs.

Perguntas frequentes

Frequently asked questions

O que é o CWE-354?

This vulnerability occurs when software fails to properly check the integrity of data by validating its checksum or hash value. Without this verification, the application cannot reliably detect if information has been altered, corrupted, or tampered with during storage or transmission.

Qual a gravidade do CWE-354?

A MITRE classifica a probabilidade de exploração como Média — a exploração é realista mas normalmente requer condições específicas.

Que linguagens ou plataformas são afetadas pelo CWE-354?

A MITRE não especificou as plataformas afetadas por este CWE — pode aplicar-se à maioria das stacks de aplicações.

Como posso prevenir o CWE-354?

Ensure that the checksums present in messages are properly checked in accordance with the protocol specification before they are parsed and used.

Como é que o Plexicus deteta e corrige o CWE-354?

O motor SAST do Plexicus correlaciona a assinatura de fluxo de dados do CWE-354 em cada commit. Quando é encontrada uma correspondência, o nosso agente Codex Remedium abre um PR de correção com o código corrigido, testes e um resumo de uma linha para o revisor.

Onde posso saber mais sobre o CWE-354?

A MITRE publica a definição canónica em https://cwe.mitre.org/data/definitions/354.html. Pode também consultar a documentação da OWASP e do NIST para orientações adjacentes.

Fraquezas relacionadas

Weaknesses related to CWE-354

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Origin Validation Error

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Improper Verification of Cryptographic Signature

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Use of Less Trusted Source

This vulnerability occurs when a system has access to multiple sources for the same critical data, but it chooses to rely on the less…

CWE-349 Irmão

Acceptance of Extraneous Untrusted Data With Trusted Data

This vulnerability occurs when a system processes both trusted and untrusted data together, but fails to separate them. The application…

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Insufficient Type Distinction

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Cross-Site Request Forgery (CSRF)

Cross-Site Request Forgery (CSRF) happens when a web application cannot reliably tell if a user actually intended to submit a request,…

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Missing Support for Integrity Check

This vulnerability occurs when a system uses a communication protocol that lacks built-in integrity verification, such as a checksum or…

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Pronto para validar o que importa.

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SAMPLE HANDOVER · ILLUSTRATIVE

Sample evidence handover

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VALIDATED FINDING Evidence attached

Server-Side Request Forgery in webhooks/receiver

demo-project/sample-app · src/webhooks/receiver.py:42

SeverityHigh CVSS 3.18.6 Priority79 Confirmedvia replay

Untrusted caller-supplied URLs reach an internal egress without an allowlist. Replayed in a sandbox against a fresh authorized target — the same control was validated to fail twice.

REVIEWER-READY REMEDIATION Merge-ready PR

Validate the target URL against an allowlist of permitted hostnames. Reject private/internal IP ranges. Enforce HTTPS only.

plexicus/remediation/webhooks-ssrf 3 changed · 0 new files
42resp = requests.get(target_url)
42+if not is_allowed_host(target_url):
43+  raise WebhookRejected(target_url)
44+resp = requests.get(target_url, timeout=5)
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  • Executive briefing
  • Validated findings list
  • Merge-ready PRs
  • Compliance mapping (NIS2 · DORA · CRA)
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