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Select Save Project in the File menu to save your project The Audit Workbench project file stores the original issue information along with the changes you made as part of your audit
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Leave Audit Workbench running; the next exercise continues where this one leaves off
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In past exercises, you reviewed a completed audit, performed your own analysis of an application, and audited a single issue from the analysis results Now it s time to perform your own security audit Equipped with analysis capabilities that typically take a source code auditor many years to learn, this exercise enables you to practice using Fortify SCA and Audit Workbench by walking you through some of the steps a software security professional would take when performing a security audit You should have already completed Exercise 147 and should have the qwik-smtpd analysis results open in Audit Workbench
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When auditing Format String issues and other dataflow findings, you need to answer two important questions: (1) Does the input source allow an attacker to include dangerous characters or content, and (2) Is there validation logic between the source and sink that eliminates the danger posed by the input In Exercise 147, you audited the Format String issue in qwik-smtpdc on line 434 The process consisted of the following steps: 1 Select the issue 2 Examine the source of tainted input Determine methods by which an attacker could control this input 3 Click on each node in the dataflow path, tracing the tainted data through the program from source to sink Look for ways in which the programmer might have mitigated the security risk posed by the input 4 Set the Analysis and Impact fields in the issue summary to indicate the importance of the issue Enter any comments that should appear with this issue in the final audit report Suppress the issue or move it to a different list if the issue so warrants
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1 Select the Buffer Overflow issue reported in qwik-smtpdc on line 587 To audit this issue, the objective is to determine whether the attacker can force the array index to fall outside the bounds of the array We follow the same four auditing steps outlined for Format String issues 2 Note that the data source is the output from the getc() call on line 584 3 Follow the dataflow path, keeping track of the maximum length of the string you are following in this case, the maximum value of the array index In this case, the program does not enforce an upper bound on the index value 4 When you reach the array index location, determine the size of the array being indexed It is a locally declared stack buffer of size 128 5 Because the array index is potentially larger than the destination buffer, this is a legitimate Buffer Overflow finding The problem is mitigated by the fact that attackers should not be allowed to control the configuration file that serves as the source of input In the Analysis drop-down, mark this issue as Dangerous Write a comment that explains the situation 6 Review the remaining Buffer Overflow issues in the same way Notice that not all of the Buffer Overflow issues are dangerous because, in some cases, the program logic prevents an overflow from occurring
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1 Select the Buffer Overflow (semantic) issue in accessc on line 1229 This type of issue does not have a dataflow trace To audit it, we must determine whether it is possible for the array index to be outside the bounds of the array In this case, buf is of size MAXUSERS It is indexed by the variable avail Reading the for loop above the array index, we see that the value of avail must be greater than zero and less than MAXUSERS This is a false positive Suppress this issue by clicking the Suppress Issue button on the Summary pane 2 Review the rest of the Buffer Overflow issues in the same way
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