CWE-653: Improper Isolation or Compartmentalization

Definition

What is CWE-653?

This vulnerability occurs when an application fails to enforce strong boundaries between components that operate at different security levels, allowing lower-privileged functions to improperly interact with higher-privileged ones.

At its core, this weakness breaks a fundamental security principle: components with different trust levels should be kept separate. When an application doesn't properly isolate features, data, or processes, a flaw in a low-privilege area can create a bridge that attackers use to reach sensitive, high-privilege areas. Think of it like a building where a broken lock on a janitor's closet somehow gives access to the entire executive suite. For developers, this means that even a minor bug in a user-facing feature can escalate into a major breach if strong compartmentalization isn't in place. To prevent this, you must design clear security boundaries—using mechanisms like process separation, sandboxing, or strict access controls—to ensure that a compromise in one module is contained and cannot spread to more critical parts of the system.

Auswirkungen in der Praxis

Real-world CVEs caused by CWE-653

CVE-2021-33096

Improper isolation of shared resource in a network-on-chip leads to denial of service
CVE-2019-6260

Baseboard Management Controller (BMC) device implements Advanced High-performance Bus (AHB) bridges that do not require authentication for arbitrary read and write access to the BMC's physical address space from the host, and possibly the network [REF-1138].

Wie Angreifer es ausnutzen

Angreiferpfad Schritt für Schritt

1
Identifiziere einen Codepfad, der nicht vertrauenswürdige Eingaben ohne Validierung verarbeitet.
2
Erzeuge eine Payload, die das unsichere Verhalten auslöst — Injection, Traversal, Overflow oder Logik-Missbrauch.
3
Liefere die Payload über einen normalen Request aus und beobachte die Reaktion der Anwendung.
4
Iteriere, bis die Antwort Daten preisgibt, Angreifer-Code ausführt oder Berechtigungen eskaliert.

Verwundbares Codebeispiel

Vulnerable pseudo

MITRE hat kein Codebeispiel für diese CWE veröffentlicht. Das untenstehende Muster ist illustrativ — kanonische Referenzen findest du unter Ressourcen.

Verwundbar pseudo

// Example pattern — see MITRE for the canonical references.
function handleRequest(input) {
  // Untrusted input flows directly into the sensitive sink.
  return executeUnsafe(input);
}

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-653

Architecture and Design Break up privileges between different modules, objects, or entities. Minimize the interfaces between modules and require strong access control between them.

Erkennungssignale

How to detect CWE-653

Automated Static Analysis - Binary or Bytecode SOAR Partial

According to SOAR, the following detection techniques may be useful: ``` Cost effective for partial coverage: ``` Compare binary / bytecode to application permission manifest

Manual Static Analysis - Source Code High

According to SOAR, the following detection techniques may be useful: ``` Highly cost effective: ``` Manual Source Code Review (not inspections) ``` Cost effective for partial coverage: ``` Focused Manual Spotcheck - Focused manual analysis of source

Architecture or Design Review High

According to SOAR, the following detection techniques may be useful: ``` Highly cost effective: ``` Inspection (IEEE 1028 standard) (can apply to requirements, design, source code, etc.) Formal Methods / Correct-By-Construction ``` Cost effective for partial coverage: ``` Attack Modeling

CWE-653

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.

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Häufig gestellte Fragen

Frequently asked questions

Was ist CWE-653?

This vulnerability occurs when an application fails to enforce strong boundaries between components that operate at different security levels, allowing lower-privileged functions to improperly interact with higher-privileged ones.

Wie gravierend ist CWE-653?

MITRE hat für diese Schwachstelle keine Exploit-Wahrscheinlichkeit veröffentlicht. Behandle sie als mittlere Auswirkung, bis dein Threat Model anderes belegt.

Welche Sprachen oder Plattformen sind von CWE-653 betroffen?

MITRE hat für diese CWE keine betroffenen Plattformen spezifiziert — sie kann in den meisten Anwendungs-Stacks auftreten.

Wie kann ich CWE-653 verhindern?

Break up privileges between different modules, objects, or entities. Minimize the interfaces between modules and require strong access control between them.

Wie erkennt und behebt Plexicus CWE-653?

Die SAST-Engine von Plexicus erkennt die Datenfluss-Signatur von CWE-653 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-653?

MITRE veröffentlicht die kanonische Definition unter https://cwe.mitre.org/data/definitions/653.html. Für ergänzende Hinweise kannst du auch die OWASP- und NIST-Dokumentation heranziehen.

Verwandte Schwachstellen

Weaknesses related to CWE-653

CWE-657 Parent

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Improper Isolation or Compartmentalization

What is CWE-653?

Real-world CVEs caused by CWE-653

Angreiferpfad Schritt für Schritt

Vulnerable pseudo

Secure pseudo

How to prevent CWE-653

How to detect CWE-653

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

Frequently asked questions

Weaknesses related to CWE-653

Violation of Secure Design Principles

Improper Identifier for IP Block used in System-On-Chip (SOC)

Dependency on Vulnerable Third-Party Component

Execution with Unnecessary Privileges

Not Failing Securely ('Failing Open')

Unnecessary Complexity in Protection Mechanism (Not Using 'Economy of Mechanism')

Not Using Complete Mediation

Reliance on a Single Factor in a Security Decision

Insufficient Psychological Acceptability

Further reading

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Sample evidence handover

Server-Side Request Forgery in `webhooks/receiver`