CWE-1314 Base Draft

Missing Write Protection for Parametric Data Values

This vulnerability occurs when a hardware device fails to protect the scaling parameters used to convert raw sensor readings. Untrusted software can alter these conversion factors, making dangerous…

Definition

What is CWE-1314?

Hardware systems use sensors to monitor critical limits for temperature, power, voltage, and other operational parameters. Trusted firmware like the BIOS typically sets and protects these safety thresholds. However, the raw data from sensors often needs to be scaled using conversion parameters to produce meaningful values (like degrees Celsius or volts). The core issue is that while the final safety limits are often locked down, these underlying scaling factors are left exposed and writable. By manipulating these unprotected scaling parameters, an attacker can distort the sensor's reported values. For example, they could make a dangerously high temperature appear within a normal range. This bypasses the intended safety checks, allowing the system to operate outside its safe design limits, which can cause physical damage to components or lead to a complete operational failure.

Auswirkungen in der Praxis

Real-world CVEs caused by CWE-1314

CVE-2017-8252

Kernel can inject faults in computations during the execution of TrustZone leading to information disclosure in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon IoT, Snapdragon Mobile, Snapdragon Voice and Music, Snapdragon Wearables, Snapdragon Wired Infrastructure and Networking.

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 Other

Malicious software executes instructions to increase power consumption to the highest possible level while causing the clock frequency to increase to its maximum value. Such a program executing for an extended period of time would likely overheat the device, possibly resulting in permanent damage to the device. A ring, oscillator-based temperature sensor will generally report the sensed value as oscillator frequency rather than degrees centigrade. The temperature sensor will have calibration values that are used to convert the detected frequency into the corresponding temperature in degrees centigrade. Consider a SoC design where the critical maximum temperature limit is set in fuse values to 100C and is not modifiable by software. If the scaled thermal sensor output equals or exceeds this limit, the system is commanded to shut itself down. The thermal sensor calibration values are programmable through registers that are exposed to system software. These registers allow software to affect the converted temperature output such that the output will never exceed the maximum temperature limit.

Verwundbar Other

The sensor frequency value is scaled by applying the function:

```
  Sensed Temp = a + b * Sensor Freq
```
where a and b are the programmable calibration data coefficients. Software sets a and b to zero ensuring the sensed temperature is always zero.

Sicheres Codebeispiel

Secure Other

This weakness may be addressed by preventing access to a and b.

Sicher Other

The sensor frequency value is scaled by applying the function:

```
  Sensed Temp = a + b * Sensor Freq
```
where a and b are the programmable calibration data coefficients. Untrusted software is prevented from changing the values of either a or b, preventing this method of manipulating the temperature.

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-1314

Architecture and Design Access controls for sensor blocks should ensure that only trusted software is allowed to change threshold limits and sensor parametric data.

Erkennungssignale

How to detect CWE-1314

SAST High

Führe statische Analyse (SAST) auf der Codebasis aus und suche im Datenfluss nach dem unsicheren Muster.

DAST Moderate

Führe dynamische Application-Security-Tests gegen den Live-Endpoint aus.

Runtime Moderate

Beobachte Runtime-Logs auf ungewöhnliche Exception-Traces, fehlerhafte Eingaben oder Versuche, Autorisierung zu umgehen.

Code review Moderate

Code Review: Markiere jeden neuen Code, der Eingaben von dieser Oberfläche ohne validierte Framework-Helper verarbeitet.

Plexicus Auto-Fix

Plexicus erkennt CWE-1314 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-1314?

Wie gravierend ist CWE-1314?

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-1314 betroffen?

MITRE lists the following affected platforms: Not OS-Specific, Not Architecture-Specific, Sensor Hardware.

Wie kann ich CWE-1314 verhindern?

Access controls for sensor blocks should ensure that only trusted software is allowed to change threshold limits and sensor parametric data.

Wie erkennt und behebt Plexicus CWE-1314?

Die SAST-Engine von Plexicus erkennt die Datenfluss-Signatur von CWE-1314 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-1314?

MITRE veröffentlicht die kanonische Definition unter https://cwe.mitre.org/data/definitions/1314.html. Für ergänzende Hinweise kannst du auch die OWASP- und NIST-Dokumentation heranziehen.

Verwandte Schwachstellen

Weaknesses related to CWE-1314

CWE-862 Parent

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CWE-425 Sibling

Direct Request ('Forced Browsing')

This vulnerability occurs when a web application fails to verify user permissions for every protected page, file, or API endpoint,…

CWE-638 Sibling

Not Using Complete Mediation

This vulnerability occurs when software fails to verify access permissions every single time a user or process tries to use a resource.…

CWE-939 Sibling

Improper Authorization in Handler for Custom URL Scheme

This vulnerability occurs when an app implements a custom URL scheme handler but fails to properly verify which other apps or sources are…

CWE-1299 Peer

Missing Protection Mechanism for Alternate Hardware Interface

This vulnerability occurs when a hardware component's security controls only protect the primary access path, leaving alternate interfaces…

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