Review a Control Flow Issue in Java

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Review a Control Flow Issue
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Use Figure 1414 to understand the memory leak issue
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Exercise 144
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[# : medium : Memory Leak : control flow ] winnerc(12) : start -> allocated : inBuf = malloc() winnerc(19) : allocated -> leak : #end_scope(inBuf)
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Figure 1414 Command-line output for a control-flow memory leak issue
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Control flow issues are similar in appearance to dataflow issues because they often comprise multiple nodes, but they differ in that the nodes refer to the steps in a sequence of operations that could be unsafe Control flow vulnerabilities are expressed as a series of state transitions Start State/End State The first state-transition entry shows that the state machine transitioned from the start state to the allocated state on line 12 The second state-transition entry shows that the state machine transitioned from the allocated state to the leak state on line 19 Transition Expression A transition expression follows the names of the start and end states It gives the code construct that triggered the transition The transition from start to allocated was caused by the call to malloc() The transition from allocated to leak was caused by the variable inBuf reaching the end of its scope The analyzer found a path through the code where free() is not called and, therefore, allocated memory is leaked Although free() is called on line 24, the function could return on line 19, so it does not guarantee that the call to free() will always be executed
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Fortify SCA can produce either human-readable output that an auditor can directly review, or a Fortify Project (FPR) file that can be consumed by Audit Workbench or other Fortify tools
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14 Source Code Analysis Exercises for C
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Rerun Fortify SCA, but this time, produce FPR output Use the f option to send output to an FPR file, as follows:
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sourceanalyzer f resultsfpr winnerc
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Rewrite winnerc to fix the security problems you have reviewed Rerun Fortify SCA to verify your work
Exercise 145 Analyzing a Full Application
This exercise demonstrates how to use Fortify SCA to analyze an entire application The analysis requires three steps: 1 Configure the project located in <install_dir>/Tutorial/c/source/ qwik-smtpd so that it compiles on your machine 2 Translate all the source files into the Fortify SCA intermediate representation Enter the following command:
sourceanalyzer -b qsmtpd make
(If you experience problems caused by conflicting definitions of getline() when compiling under Cygwin on Windows, update Cygwin s
version of stdioh to the latest version to correct the error) The command-line arguments specify two things to Fortify SCA: The build identifier Fortify SCA interprets the argument b qsmtpd to mean that the name of the project being built is qsmtpd In the scan step, we provide the same build identifier to specify that all the files associated with qwik-smtpd should be analyzed The make command Fortify SCA recognizes the make command and automatically examines any source code that is compiled when make runs
Exercise 146
3 Perform the scan Enter the following command:
sourceanalyzer b qsmtpd scan f qwik-smtpdfpr
The command could take several minutes to finish executing The command-line arguments specify three things to Fortify SCA: The build identifier The b qsmtpd argument specifies the name of the project Fortify SCA now associates all the code that was compiled in the previous step with this command The scan flag The -scan flag tells Fortify SCA to analyze the project The output file The f qwik-smtpdfpr argument tells Fortify SCA to write its output to the file qwik-smtpdfpr Because the filename ends with the extension fpr, Fortify SCA automatically writes its output in the FPR format We use Audit Workbench to examine the analysis results in the next exercise
Exercise 146 Tuning Results with Audit Workbench
This exercise describes how to use Audit Workbench to tune the results Fortify SCA generates The purpose of tuning is to restrict the set of issues for review to those that are most relevant to the application and to the auditor Generally, a professional code auditor and a security-conscious software developer will not want to review exactly the same set of results The tuning process allows different audiences to best tailor Fortify SCA for their purposes