I break applications before attackers get the chance.

finding

The application exposed predictable object identifiers without enforcing server-side authorization checks. By modifying the object identifier in a request, an authenticated user could access the administrator's profile and associated privileged information, demonstrating a critical broken object-level authorization vulnerability.

impact

An attacker could gain unauthorized access to administrator data and potentially perform privileged actions if administrative endpoints were similarly affected. This could result in full administrative account compromise, unauthorized modification of sensitive data, disclosure of confidential information, and complete loss of trust in the application's access control mechanisms.

remediation

Enforce server-side authorization on every request to verify that users can only access resources they are explicitly authorized to view or modify. Apply role-based access control (RBAC) consistently across all endpoints, use indirect identifiers where appropriate, and perform comprehensive authorization testing to identify and remediate similar vulnerabilities throughout the application.

finding

The API relied on a trusted host identifier in client requests without adequately validating the true origin or authenticity of the caller. By manipulating request headers and parameters, it was possible to impersonate an authorized host and submit requests that the API processed as trusted, bypassing intended trust boundaries.

impact

An attacker could perform privileged operations while appearing to be an authorized system, potentially accessing sensitive data, modifying records, triggering business processes, or interacting with downstream services. Successful exploitation could compromise the integrity of the application and enable unauthorized actions across integrated systems.

remediation

Do not rely on client-supplied host identifiers or headers as proof of trust. Implement strong service-to-service authentication using mechanisms such as mutual TLS (mTLS), signed requests, or short-lived OAuth 2.0/JWT access tokens. Validate the identity and authorization of every request on the server, restrict API access using least privilege, and continuously monitor for anomalous or unauthorized API activity.

finding

The API improperly validated JSON Web Tokens (JWTs), allowing authentication to be bypassed by modifying token claims without proper signature verification. By crafting a manipulated JWT containing elevated privileges (e.g., changing the user role from user to admin), the API accepted the token as valid and granted access to protected administrative endpoints. This demonstrated a failure in server-side token validation and authentication enforcement.

impact

An attacker could impersonate privileged users, gain unauthorized access to administrative functionality, retrieve or modify sensitive data, and perform actions with elevated permissions. Successful exploitation could result in complete compromise of the application's authentication and authorization mechanisms.

remediation

Enforce strict JWT signature verification using a trusted signing algorithm and secret or public key. Reject unsigned, expired, tampered, or invalid tokens, validate all security claims (including issuer, audience, expiration, and subject), and perform server-side authorization checks on every protected endpoint regardless of the token's contents.

finding

An AWS IAM review identified an IAM user with permissions that exceeded its operational requirements, including the ability to create and attach IAM policies to users and roles. The account violated the principle of least privilege, increasing the risk of privilege escalation if the credentials were compromised.

impact

An attacker who gained access to the affected IAM credentials could escalate privileges, create or modify IAM users and roles, access additional AWS resources, and potentially compromise sensitive data or critical cloud infrastructure. The excessive permissions significantly increased the potential impact of a credential compromise.

remediation

Apply the principle of least privilege by restricting IAM permissions to only those required for the user's role. Remove unnecessary administrative privileges, use managed roles instead of long-term IAM users where possible, enforce multi-factor authentication (MFA), regularly review IAM policies, and monitor privileged activities using AWS CloudTrail and AWS IAM Access Analyzer.