Each year the reported number of security vulnerabilities increases as does the sophistication of attacks to exploit these vulnerabilities. Most security vulnerabilities are the result of insecure coding practices. There is a critical need to increase the security education of computer science students, particularly in software security. We are designing course modules, to be used at the undergraduate or graduate level, to integrate software system security into our computer science curriculum. The course modules we have developed, and are developing, include: operating system security, software security testing, code review, risk analysis, and database security.