Static Analysis as Part of the Code Review Process in Java

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3 Static Analysis as Part of the Code Review Process
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Static analysis results can also help a security team decide when it s time to audit a piece of code The rate of auditing should keep pace with the rate of development Better yet, it should keep pace with the rate at which potential security issues are introduced into the code By tracking individual issues over time, static analysis results can show a security team how many unreviewed issues a project contains Figure 37 presents a typical graph At the point the project is rst reviewed, audit coverage goes to 100% Then, as the code continues to evolve, the audit coverage decays until the project is audited again Another view of this same data gives a more comprehensive view of the project An audit history shows the total number of results, number of results reviewed, and number of vulnerabilities identified in each build This view takes into account not just the work of the code reviewers, but the effect the programmers have on the project Figure 38 shows results over roughly one month of nightly builds At the same time the code review is taking place, development is in full swing, so the issues in the code continue to change As the auditors work, they report vulnerabilities (shown in black)
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100%
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Percent Issues Reviewed
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Figure 37 Audit coverage over time After all static analysis results are reviewed, the code continues to evolve and the percentage of reviewed issues begins to decline
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150 Total Issues Found Issues Reviewed 100 Vulnerabilities
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9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
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Figure 38 Audit history: the total number of static analysis results, the number of reviewed results, and the number of identi ed vulnerabilities present in the project
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Around build 14, the auditors have looked at all the results, so the total number of results is the same as the number reviewed Development work is not yet complete, though, and soon the project again contains unreviewed results As the programmers respond to some of the vulnerabilities identi ed by the audit team, the number of results begins to decrease and some of the identified vulnerabilities are fixed At the far-right side of the graph, the growth in the number of reviewed results indicates that reviewers are beginning to look at the project again
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Building secure systems takes effort, especially for organizations that aren t used to paying much attention to security Code review should be part of the software security process When used as part of code review, static analysis tools can help codify best practices, catch common mistakes, and generally make the security process more ef cient and consistent But to achieve these bene ts, an organization must have a well-de ned code review process At a high level, the process consists of four steps: de ning goals, running tools, reviewing the code, and making fixes One symptom of an ineffective process is a frequent descent into a debate about exploitability
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3 Static Analysis as Part of the Code Review Process
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To incorporate static analysis into the existing development process, an organization needs a tool adoption plan The plan should lay out who will run the tool, when they ll run it, and what will happen to the results Static analysis tools are process agnostic, but the path to tool adoption is not Take style and culture into account as you develop an adoption plan By tracking and measuring the security activities adopted in the development process, an organization can begin to sharpen its software security focus The data produced by source code analysis tools can be useful for this purpose, giving insight into the kinds of problems present in the code, whether code review is taking place, and whether the results of the review are being acted upon in a timely fashion
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