CWE-482 Variant Draft Low likelihood

Comparing instead of Assigning

This vulnerability occurs when a developer accidentally uses a comparison operator (like '==') where an assignment operator (like '=') was intended, creating a logic error instead of setting a value.

Definition

What is CWE-482?

This vulnerability occurs when a developer accidentally uses a comparison operator (like '==') where an assignment operator (like '=') was intended, creating a logic error instead of setting a value.
This common coding mistake happens because assignment and comparison operators look very similar in many programming languages. For example, using `if (x = 5)` instead of `if (x == 5)` assigns the value 5 to `x` and then evaluates the assignment's result as the condition, which is often always true, breaking the intended program logic. To prevent this, developers should adopt defensive coding habits like placing constants on the left side in comparisons (e.g., `if (5 == x)`), which would cause a compilation error if written incorrectly as `if (5 = x)`. Modern compilers and linters often flag this pattern with warnings like "possible unintended assignment," which should always be investigated and corrected.
Auswirkungen in der Praxis

Real-world CVEs caused by CWE-482

Bisher sind in MITREs Katalog keine öffentlichen CVE-Referenzen mit dieser CWE verknüpft.

Wie Angreifer es ausnutzen

Angreiferpfad Schritt für Schritt

  1. 1

    The following example demonstrates the weakness.

  2. 2

    The following C/C++ example shows a simple implementation of a stack that includes methods for adding and removing integer values from the stack. The example uses pointers to add and remove integer values to the stack array variable.

  3. 3

    The push method includes an expression to assign the integer value to the location in the stack pointed to by the pointer variable.

  4. 4

    However, this expression uses the comparison operator "==" rather than the assignment operator "=". The result of using the comparison operator instead of the assignment operator causes erroneous values to be entered into the stack and can cause unexpected results.

Verwundbares Codebeispiel

Vulnerable Java

The following example demonstrates the weakness.

Verwundbar Java 
void called(int foo) {
  	foo==1;
  	if (foo==1) System.out.println("foo\n");
  }
  int main() {
  		called(2);
  		return 0;
  }
Sicheres Codebeispiel

Secure pseudo

Sicher 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.
Präventions-Checkliste

How to prevent CWE-482

  • Testing Many IDEs and static analysis products will detect this problem.
Erkennungssignale

How to detect CWE-482

Automated Static Analysis High

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.)

Plexicus Auto-Fix

Plexicus erkennt CWE-482 automatisch und öffnet in unter 60 Sekunden einen Fix-PR.

Codex Remedium scannt jeden Commit, identifiziert genau diese Schwachstelle und liefert einen reviewer-ready Pull Request mit dem Patch. Keine Tickets. Keine Hand-offs.

Demo anfordern Plexicus kostenlos testen
Häufig gestellte Fragen

Frequently asked questions

Was ist CWE-482?

This vulnerability occurs when a developer accidentally uses a comparison operator (like '==') where an assignment operator (like '=') was intended, creating a logic error instead of setting a value.

Wie gravierend ist CWE-482?

MITRE stuft die Exploit-Wahrscheinlichkeit als niedrig ein — eine Ausnutzung ist selten, die Schwachstelle sollte aber dennoch behoben werden, sobald sie entdeckt wird.

Welche Sprachen oder Plattformen sind von CWE-482 betroffen?

MITRE lists the following affected platforms: C, C++.

Wie kann ich CWE-482 verhindern?

Many IDEs and static analysis products will detect this problem.

Wie erkennt und behebt Plexicus CWE-482?

Die SAST-Engine von Plexicus erkennt die Datenfluss-Signatur von CWE-482 bei jedem Commit. Bei einem Treffer öffnet unser Codex-Remedium-Agent einen Fix-PR mit korrigiertem Code, Tests und einer einzeiligen Zusammenfassung für den Reviewer.

Wo erfahre ich mehr über CWE-482?

MITRE veröffentlicht die kanonische Definition unter https://cwe.mitre.org/data/definitions/482.html. Für ergänzende Hinweise kannst du auch die OWASP- und NIST-Dokumentation heranziehen.

Verwandte Schwachstellen

Weaknesses related to CWE-482

CWE-480 Parent

Use of Incorrect Operator

This vulnerability occurs when a developer mistakenly uses the wrong operator in their code, leading to unintended and potentially…

CWE-481 Sibling

Assigning instead of Comparing

This flaw occurs when a developer accidentally uses the assignment operator (=) instead of the comparison operator (== or ===). The code…

CWE-597 Sibling

Use of Wrong Operator in String Comparison

This vulnerability occurs when a developer incorrectly compares string values, typically by using reference equality operators (like == or…

Ressourcen

Further reading

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