SRE School

Insecure Code Execution Vulnerability: An insecure code execution vulnerability arises when an application allows executing arbitrary code or system commands. If the application does not properly handle user inputs or files, an attacker could upload a malicious file (e.g., a PHP script) that can execute system commands on the server. For example, if an attacker…

Lack of Logging and Monitoring Vulnerability: Without proper logging and monitoring mechanisms, malicious activities, such as uploading and executing harmful files, can go unnoticed. If an attacker uploads a malicious file (e.g., a PHP shell) and executes it on the server, it can lead to a full server compromise, data theft, or further exploitation. Without…

Insecure PHP Configuration Vulnerability: Scenario: An insecure PHP configuration can occur when a directory that allows file uploads also permits the execution of PHP scripts. In particular, if the upload directory is within a web-accessible path, PHP files that are uploaded could be executed by the web server, potentially leading to the execution of malicious…

Weak Authentication and Authorization Vulnerability: Scenario: Insecure or weak authentication and authorization mechanisms can allow attackers to bypass the normal security checks. This can lead to unauthorized users being able to upload files, or an attacker impersonating an authorized user to upload malicious files. A common example is a file upload functionality that does not…

Improper Handling of HTTP Requests: CSRF (Cross-Site Request Forgery) Vulnerability Scenario: Cross-Site Request Forgery (CSRF) is a type of attack that tricks an authenticated user into performing an action without their consent. If a website does not implement proper CSRF protection, an attacker can craft a malicious request that, when executed by an authenticated user,…

Unprotected Web Shells Vulnerability: A web shell is a malicious script uploaded by an attacker to a server that allows them to control the server remotely. If an attacker successfully uploads a PHP file to a server’s upload directory (or any accessible directory), they can use it as a web shell. A web shell often…

Insecure Permissions: Insecure Permissions Vulnerability: Scenario: Insecure permissions occur when web server directories are not correctly configured with the least privileges. If an attacker can upload files to a directory that is incorrectly configured with excessive write or execute permissions, the attacker may be able to upload malicious files (e.g., PHP shells, scripts, etc.) and…

2. Directory Traversal: Fix: Ensure that file upload paths are constrained to safe, non-executable directories. Use functions like realpath() to get the absolute path and prevent directory traversal. Directory Traversal Exploits: If the file upload functionality is not properly sandboxed, a hacker may exploit it to navigate through directories and upload files to sensitive parts…

Here are common reasons and potential vulnerabilities that might have been exploited: 1. File Upload Vulnerability: Imagine a web application that allows users to upload images, such as .jpg or .png files. However, the application only validates the file extension (e.g., .jpg, .png) without checking the MIME type or scanning the file contents. A malicious…