Review the Path from Source to Sink Using the Analysis Trace Panel in Java

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1 Each node in the Analysis Trace panel corresponds to a step involved in the selected issue For dataflow issues, each node corresponds to a function call, assignment, or return statement that the data being tracked were involved in on its way between the source and sink Although some analysis traces look almost like stack traces, avoid the temptation to think of them this way Rather, treat them as events along a timeline: Time starts at the top of the Analysis Trace panel and progresses until the last node, which is where the issue occurs
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The last node in the Analysis Trace is displayed by default when a new issue is selected 2 Select the first node in the Analysis Trace, which corresponds to the dataflow source The corresponding source code is displayed in the source code panel with the function that introduced the user input that will eventually make its way to the sink highlighted In this case, the source is a call to getline(), which fills the buffer with data read from stdin 3 Select each of the nodes between the source (first node) and sink (last node) Notice that none of the expressions through which the dataflow analyzer tracks the tainted value performs any validation or otherwise lessens the risk of a format string attack The icons in Table 142 appear in dataflow paths and indicate the type of expression at each node
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Table 142 Analysis trace icons and corresponding expression types Icon Expression Type Return statement Return value Assignment Pass-through Function call
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The Summary and Details panels serve the dual purpose of providing additional information about the issue selected in the Navigator panel and also enabling the user to annotate the issue with comments and assign an audit status Notice that the issue s vulnerability category is listed in bold to the right of the panel along with the vulnerability family it belongs to and the specific analyzer that detected it Below the category information is a brief explanation of the vulnerability and the View More Details button, which displays a full description of the issue on the Details panel The Location field shows the relative path from the root of the project to the file in which the issue was discovered
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1 Select the Details panel for a more detailed description of the issue, including an explanation of the issue, complete with examples, recommendations about how to resolve the problem, useful tips on auditing similar issues, and references to further reading on the subject When you have read enough about format string vulnerabilities, select the Summary panel again to continue 2 Below the information fields just mentioned is a text-input area Write a brief description of the problem and why you think it is vulnerable This comment should include information you learned during your review of the issue, such as the type of data that caused the issue (user input from getline()), what (if any) validation was performed (none), and the significance of the issue, given the context in which it appears (serious if this code appeared in production) Additionally, consider including portions of the description found in the Details panel that could be relevant when reviewing the issue or a subsequent report In this case, including advice from the Recommendations section that discusses using a static format string would be useful 3 On the right side of the Summary panel are several drop-down menus and two buttons The drop-down menus are for recording the results of an audit Choose Exploitable from the Analysis menu to indicate that this issue is exploitable by an attacker Notice that the Status menu changes to Reviewed automatically Select High from the Impact menu because this vulnerability is remotely exploitable You can move the issue to either Warnings or Info by changing the selection in the List menu Given that this is an exploitable issue, the Hot list seems an appropriate place for it to remain If after auditing the issue you determined that it was actually safe, you could suppress it by clicking Suppress Issue However, if the issue needs to be resolved by a developer, you can click the File Bug button to automatically generate a bug report (this requires configuration through the Options menu)
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