CWE-378: Creation of Temporary File With Insecure Permissions
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Edit Custom FilterOpening temporary files without appropriate measures or controls can leave the file, its contents and any function that it impacts vulnerable to attack.
This table specifies different individual consequences
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violated, while the Impact describes the negative technical impact that arises if an
adversary succeeds in exploiting this weakness. The Likelihood provides information about
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Relevant to the view "Research Concepts" (CWE-1000)
Relevant to the view "Software Development" (CWE-699)
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Languages Class: Not Language-Specific (Undetermined Prevalence) Example 1 In the following code examples a temporary file is created and written to. After using the temporary file, the file is closed and deleted from the file system. (bad code)
Example Language: C
FILE *stream;
if( (stream = tmpfile()) == NULL ) { perror("Could not open new temporary file\n"); return (-1); // write data to tmp file ... // remove tmp file rmtmp(); However, within this C/C++ code the method tmpfile() is used to create and open the temp file. The tmpfile() method works the same way as the fopen() method would with read/write permission, allowing attackers to read potentially sensitive information contained in the temp file or modify the contents of the file. (bad code)
Example Language: Java
try {
File temp = File.createTempFile("pattern", ".suffix"); }temp.deleteOnExit(); BufferedWriter out = new BufferedWriter(new FileWriter(temp)); out.write("aString"); out.close(); catch (IOException e) { } Similarly, the createTempFile() method used in the Java code creates a temp file that may be readable and writable to all users. Additionally both methods used above place the file into a default directory. On UNIX systems the default directory is usually "/tmp" or "/var/tmp" and on Windows systems the default directory is usually "C:\\Windows\\Temp", which may be easily accessible to attackers, possibly enabling them to read and modify the contents of the temp file.
This MemberOf Relationships table shows additional CWE Categories and Views that
reference this weakness as a member. This information is often useful in understanding where a
weakness fits within the context of external information sources.
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