This article focuses on techniques for bypassing Web Application Firewalls (WAFs) through command injection attacks, with a focus on Linux payloads.
Command injection involves injecting malicious commands that are executed on the server hosting the application, potentially granting the attacker access to or control over the server.
There are two types of command injection: response-based and blind.
The attacker typically uses special characters and commands to manipulate the application or breach security protocols; in this article, the focus is on bypassing WAFs using unusual techniques involving Bash commands.
These techniques include using double and single quotes, asterisks, and parentheses to manipulate commands and inject malicious code.
While some WAFs may be able to detect and block these attacks, the uniqueness of these techniques may allow them to slip through in certain cases.