Usama Rasheed's Work | ContraWork by Usama Rasheed
Usama Rasheed

Usama Rasheed

Web security expert & pentesting specialist.

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Lahore, Pakistan

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Lahore, Pakistan

Cover image for Top Vulnerability Findings in OWASP A02 Cryptographic Failures
OWASP A02: Cryptographic Failures šŸ” OWASP A02 ā€” Cryptographic Failures Assessment Overview Conducted a manual assessment focusing on the protection of sensitive data during storage and transmission. What I Found Sensitive information exposed inside JWTs JWT information disclosure Missing Secure, HttpOnly, and SameSite cookie attributes HTTP used instead of HTTPS Stack trace and debug information disclosure Application version disclosure Impact Sensitive information leakage can assist attackers in account compromise, session theft, and application reconnaissance. Mitigation Avoid storing sensitive data inside JWTs. Enforce HTTPS across the application. Configure cookies with Secure, HttpOnly, and SameSite. Disable verbose error messages in production. Minimize unnecessary information disclosure. Tools Used Burp Suite Professional JWT Decoder Browser Developer Tools
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OWASP A01: Broken Access Control šŸ”’ OWASP A01 ā€” Broken Access Control Assessment Overview Performed a manual security assessment of a vulnerable web application to identify Broken Access Control issues affecting API endpoints. What I Found Horizontal Privilege Escalation (IDOR) Vertical Privilege Escalation Unauthorized access to restricted API endpoints User enumeration through exposed APIs Impact Unauthorized users could access resources belonging to other users and retrieve sensitive information without proper authorization. Mitigation Enforce server-side authorization on every request. Implement Role-Based Access Control (RBAC). Validate object ownership before returning data. Apply the principle of least privilege. Tools Used Burp Suite Professional Firefox Developer Tools JWT Decoder
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šŸšØ Vulnerability Spotlight: OS Command Injection āš ļø The Flaw: Unsanitized input in a "Ping Device" feature allowed arbitrary command execution directly on the server shell. šŸ•µļøā€ā™‚ļø The Exploit (via Burp Suite): Instead of a normal IP, I injected shell metacharacters: 127.0.0.1; cat /etc/passwd. Result: The backend blindly executed it, leaking sensitive OS files and confirming unauthorized system access. šŸ›”ļø The Fix: āœ… Stop Direct Execution: Never pass raw input to exec() or system(). āœ… Strict Allow-listing: Validate inputs with Regex (e.g., enforce standard IPv4 format). āœ… Command Escaping: Neutralize malicious operators using escapeshellarg(). Rule of thumb: Never trust user input!
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Cover image for Emergency recovery and malware removal
Emergency recovery and malware removal for a compromised website, transforming it from a hacked state to a fully secured, hardened, and operational platform.
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