Use of getlogin() in Multithreaded Application
The application uses the getlogin() function in a multithreaded context, potentially causing it to return incorrect values.
The getlogin() function returns a pointer to a string that contains the name of the user associated with the calling process. The function is not reentrant, meaning that if it is called from another process, the contents are not locked out and the value of the string can be changed by another process. This makes it very risky to use because the username can be changed by other processes, so the results of the function cannot be trusted.
The following examples help to illustrate the nature of this weakness and describe methods or techniques which can be used to mitigate the risk.
Note that the examples here are by no means exhaustive and any given weakness may have many subtle varieties, each of which may require different detection methods or runtime controls.
The following code relies on getlogin() to determine whether or not a user is trusted. It is easily subverted.
This category identifies Software Fault Patterns (SFPs) within the Use of an Improper API cluster (SFP3).
This category represents one of the phyla in the Seven Pernicious Kingdoms vulnerability classification. It includes weaknesses that involve the software using an API ...
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This view (slice) lists weaknesses that can be introduced during implementation.
This view (slice) covers issues that are found in C++ programs that are not common to all languages.