Summary
Weaver E-cology 8.0 contains a path traversal vulnerability in the FileDownload endpoint that may allow unauthenticated attackers to read arbitrary files from the server.
The issue becomes risky when user-controlled file path input is accepted without adequately restricting it to an intended directory or validating resolved paths.
Weaver E-cology 8.0 contains a path traversal vulnerability in the FileDownload endpoint that may allow unauthenticated attackers to read arbitrary files from the server.
The issue becomes risky when user-controlled file path input is accepted without adequately restricting it to an intended directory or validating resolved paths.
Affected context
The vulnerability occurs in deployments exposing the /weaver/ln.FileDownload endpoint when the fpath parameter influences which server-side file is returned.
Risk is increased when the endpoint is accessible without authentication and file paths are not constrained to an approved storage location. Sensitive application configuration files, including deployment descriptors, may be exposed.
The vulnerability occurs in deployments exposing the /weaver/ln.FileDownload endpoint when the fpath parameter influences which server-side file is returned.
Risk is increased when the endpoint is accessible without authentication and file paths are not constrained to an approved storage location. Sensitive application configuration files, including deployment descriptors, may be exposed.
Exploit preconditions
- Attack surface: The HTTP FileDownload endpoint
- Required access: Network access to the endpoint; authentication may not be required
- Trigger point: Processing of the user-controlled
fpathparameter - Why exploitation is possible: The application may resolve attacker-influenced paths without sufficiently preventing traversal outside the intended download directory
- Attack surface: The HTTP FileDownload endpoint
- Required access: Network access to the endpoint; authentication may not be required
- Trigger point: Processing of the user-controlled
fpathparameter - Why exploitation is possible: The application may resolve attacker-influenced paths without sufficiently preventing traversal outside the intended download directory
Why this happens
The underlying bug is insufficient validation and canonicalization of a user-supplied file path.
When an application uses externally controlled path components to access files without enforcing a trusted base directory, traversal notation can cause resolution outside the permitted location.
This maps to CWE-22: Improper Limitation of a Pathname to a Restricted Directory, commonly known as path traversal.
The underlying bug is insufficient validation and canonicalization of a user-supplied file path.
When an application uses externally controlled path components to access files without enforcing a trusted base directory, traversal notation can cause resolution outside the permitted location.
This maps to CWE-22: Improper Limitation of a Pathname to a Restricted Directory, commonly known as path traversal.
Potential impact
- Attackers may read arbitrary files accessible to the application process
- Sensitive configuration, deployment, or credential material could be disclosed
- Exposed files could support further compromise of the application or host
- Information leakage could aid reconnaissance and lateral movement
- Attackers may read arbitrary files accessible to the application process
- Sensitive configuration, deployment, or credential material could be disclosed
- Exposed files could support further compromise of the application or host
- Information leakage could aid reconnaissance and lateral movement
General mitigation guidance
Mitigation typically focuses on eliminating direct trust in client-supplied file paths.
Common defensive patterns include:
- Resolve requested files against a fixed, trusted storage directory and verify that the canonical result remains within that directory
- Prefer opaque file identifiers or server-managed mappings instead of accepting filesystem paths
- Apply strict allowlists for permitted filenames and file types
- Reject traversal syntax, encoded path separators, and unexpected path representations as a defense-in-depth measure
- Run the application with the least filesystem privileges necessary
- Avoid storing secrets and sensitive configuration files in web-accessible locations
Mitigation typically focuses on eliminating direct trust in client-supplied file paths.
Common defensive patterns include:
- Resolve requested files against a fixed, trusted storage directory and verify that the canonical result remains within that directory
- Prefer opaque file identifiers or server-managed mappings instead of accepting filesystem paths
- Apply strict allowlists for permitted filenames and file types
- Reject traversal syntax, encoded path separators, and unexpected path representations as a defense-in-depth measure
- Run the application with the least filesystem privileges necessary
- Avoid storing secrets and sensitive configuration files in web-accessible locations
How teams detect issues like this
Organizations commonly detect path traversal risks through:
- Static analysis for filesystem APIs receiving request parameters or other untrusted input
- Code review checks for missing canonicalization and trusted-directory boundary validation
- Dynamic testing of file download functionality with normalized, encoded, and alternate path representations
- Web application firewall or gateway policies that monitor suspicious path parameters
- Access-log review for unusual file download requests and repeated failures
Automated security testing and code review tools can help identify these patterns during development.
Organizations commonly detect path traversal risks through:
- Static analysis for filesystem APIs receiving request parameters or other untrusted input
- Code review checks for missing canonicalization and trusted-directory boundary validation
- Dynamic testing of file download functionality with normalized, encoded, and alternate path representations
- Web application firewall or gateway policies that monitor suspicious path parameters
- Access-log review for unusual file download requests and repeated failures
Automated security testing and code review tools can help identify these patterns during development.
