This article explains how simple file upload features can turn into dangerous vulnerabilities, leading to complete server takeovers. It highlights common mistakes in validation mechanisms, real-world exploitation scenarios, and the importance of understanding server behavior and bypassing techniques. #WebShells #PathTraversal
Keypoints
- File upload vulnerabilities occur when servers fail to properly validate uploaded files.
- Attackers can upload malicious scripts like PHP to gain remote code execution.
- Common validation mistakes include relying on client-side checks, blacklisting extensions, and trusting Content-Type headers.
- Path traversal can be exploited to upload files outside restricted directories, bypassing defenses.
- Web shells provide attackers with tools for ongoing server control, risking data theft and further attacks.