BADFUNC.TEMP.MKSTEMP : Use of mkstemp

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CodeSonar^® 9.2p0

CONFIDENTIAL

CodeSecure Inc

C and C++

Binaries

BADFUNC.TEMP.MKSTEMP : Use of mkstemp

Summary

A use of mkstemp(), which is associated with temporary file vulnerabilities.

Properties

Class Name

Use of mkstemp

Significance

security

Mnemonic

BADFUNC.TEMP.MKSTEMP

Categories

CWE	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
BSI	BSI:Mkstemp	Use of mkstemp
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	OWASP-2021:A6	Vulnerable and outdated components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 disabled by default. To enable them, add the following WARNING_FILTER rule to the project configuration file.

WARNING_FILTER += allow class="Use of mkstemp"

To enable all BSI-related classes, including all BSI-specific BADFUNC classes, use the bsi configuration preset.

Resolution

When you see a Use of mkstemp warning, make sure that the created temporary file is not subsequently referred to by name, and that it is stored in a secure temporary directory. 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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