This specific pattern bypasses poorly implemented security filters to access sensitive system files like /etc/passwd on Linux servers. Anatomy of the Payload
The URL in question, "-page-....-2F-2F....-2F-2F....-2F-2Fetc-2Fpasswd," appears to be crafted with the intention of accessing a specific file on a system, presumably to exploit vulnerabilities or achieve unauthorized access. Let's decode its components: -page-....-2F-2F....-2F-2F....-2F-2Fetc-2Fpasswd
: The character sequence -2F (or more traditionally %2F ) is the URL-encoded representation of the forward slash ( / ). Attackers use dashes or alternative delimiters to bypass naive regex filters that only scan for %2F . Attackers use dashes or alternative delimiters to bypass
: These attacks often target known vulnerabilities in outdated plugins or frameworks. 2. Implement Strict Whitelisting
Use realpath() to resolve all relative symlinks and dot-dot sequences, then verify the root path. 2. Implement Strict Whitelisting