Reviewing Code for Authorization Issues
Authorization issues cover a wide array of lyers in a web application; from the functional authorization of a user to gain access to a perticular funcation of the application is at the app layer to the Database access authorization and least privilege issues at the persistence layer. So what to look for whe performing a code review. From an attack perspective the most common issues are a result of curiousity and also exploitation of vulnerabilities such as SQL injection. Example: A Database account used by an application with system/admin access upon which the application was vulnerable to SQL injection would result in a higher degree of impact rather than the same vulnerable application with a least privilege database account.