By far the most effective means of eliminating path traversal vulnerabilities is to avoid passing user-submitted data to any file system API. In many cases, including the original example GetImage.aspx?file=diagram1.jpg , it is entirely unnecessary for an application to do this. For most files that are not subject to any access control, the files can simply … Read more
Path traversal vulnerabilities are often subtle and hard to detect, and it may be necessary to prioritize your efforts on locations within the application that are most likely to manifest the vulnerability. Locating Targets for Attack During your initial mapping of the application, you should already have identified any obvious areas of attack surface in … Read more
Many kinds of functionality oblige a web application to read from or write to a file system on the basis of parameters supplied within user requests. If these operations are carried out in an unsafe manner, an attacker can submit crafted input which causes the application to access files that the application designer did not … Read more