Summary
Apache Roller 6.1.5 contains a Cross-Site Request Forgery vulnerability in its request validation filters. A remote attacker may cause a logged-in author or administrator to perform state-changing actions by inducing the victim to visit a crafted page, without needing a special feature or non-default configuration.
Affected context
The issue occurs in Apache Roller deployments where authenticated users can perform state-changing actions through requests protected by the affected CSRF validation filters. The risk is present under default conditions when a logged-in author or administrator is induced to access attacker-controlled content, including requests involving multipart forms.
Exploit preconditions
- Attack surface: Web requests handled by Apache Roller
- Required access: A victim must be authenticated as an author or administrator
- Trigger point: The victim's browser sends a state-changing request to Roller
- Attacker condition: The attacker must induce the authenticated user to visit a crafted page or otherwise cause the browser to issue the request
- Why exploitation is possible: The validation logic can accept a request without the required submitted salt token by comparing against a server-generated value associated with the request
Why this happens
The vulnerability results from incorrect CSRF token validation. Instead of requiring and validating a token submitted by the client against the server-side expected value, the affected logic can validate a value that the server generated for the request itself. This breaks the trust boundary required for CSRF defenses and maps to CWE-352, where an application accepts unauthorized state-changing requests from a user's authenticated browser.
Potential impact
- An attacker may cause authenticated users to perform unauthorized state-changing actions
- Account, content, or configuration data could be modified under the victim's authority
- Administrative actions could be triggered when an administrator is targeted
- The application may lose confidence that sensitive requests were intentionally initiated by the user
General mitigation guidance
Mitigation generally focuses on enforcing a complete, server-validated CSRF
token workflow for every state-changing request.
Common defensive patterns include:
- Require a token to be explicitly submitted by the client and compare it with a server-side value bound to the user session
- Apply the same validation rule to standard and multipart form submissions
- Reject missing, malformed, expired, or mismatched tokens by default
- Use secure cookie attributes and appropriate same-site policies as defense-in-depth controls
- Limit administrative privileges and require additional confirmation for especially sensitive actions
- Avoid relying on request-origin signals or server-generated request values as substitutes for submitted CSRF tokens
How teams detect issues like this
Organizations commonly detect CSRF validation weaknesses through:
- Static analysis for state-changing handlers that lack token checks or validate server-created request values
- Code review of security filters, form handlers, multipart parsers, and token comparison logic
- Dynamic tests that omit, alter, or replay CSRF tokens across authenticated requests
- Policy enforcement requiring CSRF protection on all non-idempotent endpoints
- Automated application security testing and code review tools that flag missing or ineffective CSRF controls
