Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)
CWE-547 Base Rascunho
Use of Hard-coded, Security-relevant Constants
This vulnerability occurs when code directly embeds security-critical values like passwords, cryptographic keys, or access levels as raw numbers or strings, instead of using named constants or…
Definição
What is CWE-547?
This vulnerability occurs when code directly embeds security-critical values like passwords, cryptographic keys, or access levels as raw numbers or strings, instead of using named constants or configuration files. This practice makes the code brittle and error-prone during updates or security reviews.
Hard-coding security values creates a maintenance nightmare. If a secret needs to be rotated or a permission level changed, developers must hunt through the entire codebase for every occurrence. Missing just one instance can introduce a security gap or break functionality. Once software is deployed, updating these embedded values often requires a full re-release, which may not even be possible in some environments.
These constants also risk exposure if the code is ever leaked or reverse-engineered, turning a simple configuration change into a major breach. While SAST tools can flag the pattern, Plexicus uses AI to not only detect these hard-coded secrets but also suggest the specific code fix—like moving the value to a secure configuration manager—saving hours of manual refactoring and reducing human error.
Impacto no mundo real
Real-world CVEs caused by CWE-547
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
The usage of symbolic names instead of hard-coded constants is preferred.
- 2
The following is an example of using a hard-coded constant instead of a symbolic name.
- 3
If the buffer value needs to be changed, then it has to be altered in more than one place. If the developer forgets or does not find all occurrences, in this example it could lead to a buffer overflow.
- 4
In this example the developer will only need to change one value and all references to the buffer size are updated, as a symbolic name is used instead of a hard-coded constant.
Exemplo de código vulnerável
Vulnerable C
The following is an example of using a hard-coded constant instead of a symbolic name.
char buffer[1024];
...
fgets(buffer, 1024, stdin); Exemplo de código seguro
Secure C
If the buffer value needs to be changed, then it has to be altered in more than one place. If the developer forgets or does not find all occurrences, in this example it could lead to a buffer overflow.
enum { MAX_BUFFER_SIZE = 1024 };
...
char buffer[MAX_BUFFER_SIZE];
...
fgets(buffer, MAX_BUFFER_SIZE, stdin); 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-547
- Implementation Avoid using hard-coded constants. Configuration files offer a more flexible solution.
Sinais de deteção
How to detect CWE-547
O Plexicus deteta automaticamente o CWE-547 e abre um PR de correção em menos de 60 segundos.
O Codex Remedium analisa cada commit, identifica esta fraqueza exata e entrega um pull request pronto para revisão com o patch. Sem tickets. Sem transferências.
Perguntas frequentes O que é o CWE-547?
Qual a gravidade do CWE-547?
Que linguagens ou plataformas são afetadas pelo CWE-547?
Como posso prevenir o CWE-547?
Como é que o Plexicus deteta e corrige o CWE-547?
Onde posso saber mais sobre o CWE-547?
Frequently asked questions
O que é o CWE-547?
This vulnerability occurs when code directly embeds security-critical values like passwords, cryptographic keys, or access levels as raw numbers or strings, instead of using named constants or configuration files. This practice makes the code brittle and error-prone during updates or security reviews.
Qual a gravidade do CWE-547?
A MITRE não publicou uma classificação de probabilidade de exploração para esta fraqueza. Trate-a como impacto médio até o seu modelo de ameaças provar o contrário.
Que linguagens ou plataformas são afetadas pelo CWE-547?
A MITRE não especificou as plataformas afetadas por este CWE — pode aplicar-se à maioria das stacks de aplicações.
Como posso prevenir o CWE-547?
Avoid using hard-coded constants. Configuration files offer a more flexible solution.
Como é que o Plexicus deteta e corrige o CWE-547?
O motor SAST do Plexicus correlaciona a assinatura de fluxo de dados do CWE-547 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-547?
A MITRE publica a definição canónica em https://cwe.mitre.org/data/definitions/547.html. Pode também consultar a documentação da OWASP e do NIST para orientações adjacentes.
Fraquezas relacionadas
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