CWE-379 Creation of Temporary File in Directory with Insecure Permissions

The product creates a temporary file in a directory whose permissions allow unintended actors to determine the file's existence or otherwise access that file.

• Confidentiality: Read Application Data — On some operating systems, the fact that the temporary file exists may be apparent to any user with sufficient privileges to access that directory. Since the file is visible, the application that is using the temporary file could be known. If one has access to list the processes on the system, the attacker has gained information about what the user is doing at that time. By correlating this with the applications the user is running, an attacker could potentially discover what a user's actions are. From this, higher levels of security could be breached.

• [Requirements] Many contemporary languages have functions which properly handle this condition. Older C temp file functions are especially susceptible. • [Implementation] Try to store sensitive tempfiles in a directory which is not world readable -- i.e., per-user directories. • [Implementation] Avoid using vulnerable temp file functions.

• Automated Static Analysis: 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.)

• CVE-2022-27818: A hotkey daemon written in Rust creates a domain socket file underneath /tmp, which is accessible by any user. • CVE-2021-41989: analytic platform's repair functionality uses the %TEMP% folder of a user while running with higher privileges • CVE-2021-21290: A Java-based application for a rapid-development framework uses File.createTempFile() to create a random temporary file with insecure default permissions.