BADFUNC.TEMP.TMPFILE : Use of tmpfile

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CodeSonar^® 9.2p0

CONFIDENTIAL

CodeSecure Inc

C and C++

Binaries

BADFUNC.TEMP.TMPFILE : Use of tmpfile

Summary

A use of tmpfile() or _tmpfile(), which are associated with temporary file vulnerabilities.

Properties

Class Name

Use of tmpfile

Significance

security

Mnemonic

BADFUNC.TEMP.TMPFILE

Categories

CWE	CWE:242	Use of Inherently Dangerous Function
	CWE:377	Insecure Temporary File
	CWE:676	Use of Potentially Dangerous Function
CERT-C	CERT-C:FIO01-C	Be careful using functions that use file names for identification
	CERT-C:FIO21-C	Do not create temporary files in shared directories
OWASP-2017	OWASP-2017:A5	Broken access control
	OWASP-2017:A9	Using components with known vulnerabilities
OWASP-2021	OWASP-2021:A1	Broken access control
	OWASP-2021:A4	Insecure design
	OWASP-2021:A6	Vulnerable and outdated components
OWASP-2025	OWASP-2025:A01	Broken Access Control
	OWASP-2025:A03	Software Supply Chain Failures
	OWASP-2025:A06	Insecure Design

Availability

Available for C and C++.

Enabling

Checks for this warning class are enabled by default. To disable them, add the following WARNING_FILTER rule to the project configuration file.

WARNING_FILTER += discard class="Use of tmpfile"

Resolution

When you see a Use of tmpfile warning, make sure that security risks have been minimized as much as possible.

Create temporary files in a secure directory, with appropriate umask and mode, and with names that cannot be easily guessed.
Delete temporary files as soon as they are no longer needed.
Avoid interleaved operations on temporary files as much as possible.

If so, you can change the warning state to Suppressed.

Relevant Configuration File Parameters

This class is implemented using a BAD_FUNCTION_* rule set in the general template configuration file.

To include an additional function or set of functions in the checks for this class, create a new set of BAD_FUNCTION_* rules in which the BAD_FUNCTION_REGEX setting matches the function or set of functions you want to check and the remaining rules match those in the other sets for this class.
To remove a function or set of functions from the checks for this class, edit the configuration file to comment out the corresponding set of BAD_FUNCTION_* rules.

The following configuration file parameters affect checks for this warning class.

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