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Path Traversal occurrences in Opensis
OS4Ed OpenSIS Community 8.0 is vulnerable to a local file inclusion vulnerability in Modules.php (modname parameter), which can disclose arbitrary file from the server's filesystem as long as the application has access to the file. (2021-09-29, CVE-2021-40651)
OpenSIS Community Edition version <= 7.6 is affected by a local file inclusion vulnerability in DownloadWindow.php via the "filename" parameter. (2021-09-16, CVE-2021-27341)
A remote code execution vulnerability exists in the Modules.php functionality of OS4Ed openSIS 7.3. A specially crafted HTTP request can cause local file inclusion. An attacker can send an HTTP request to trigger this vulnerability. (2020-09-01, CVE-2020-6142)
openSIS through 7.4 allows Directory Traversal. (2020-07-01, CVE-2020-13383)
Why Path Traversal can be dangerous
Relative Path Confusion means that your web server is configured to serve responses to ambiguous URLs. This configuration can possibly cause confusion about the correct relative path for the URL. It is also an issue of resources, such as images, styles etc., which are specified in the response using relative path, not the absolute URL.
If the web browser permits to parse "cross-content" response, the attacker may be able to fool the web browser into interpreting HTML into other content types, which can then lead to a cross site scripting attack (link do XSS).