Summary
Kiteworks Secure Data Forms before version 9.5.0 contains a server-side request forgery vulnerability that may let an unauthenticated remote attacker cause the server to send arbitrary outbound network requests.
Because the server may return response data, attackers could potentially access internal-only services or other network-restricted resources reachable from the application environment.
Affected context
The vulnerability occurs in deployments of Kiteworks Secure Data Forms where externally influenced request handling allows the application server to connect to attacker-selected destinations and expose the resulting responses. Risk depends on the server's network reachability, outbound filtering, and the availability of internal services that trust requests from the application environment.
Exploit preconditions
- Attack surface: Network-accessible Secure Data Forms functionality
- Required access: No authentication may be required
- Trigger point: A server-side request-processing path that accepts attacker-influenced destinations
- Why exploitation is possible: The application performs outbound requests on behalf of the requester and may return response content without sufficiently restricting destinations or protocols
Why this happens
The underlying flaw is insufficient validation and authorization of server-side outbound requests. A request destination influenced by an untrusted client is used by the application without reliably enforcing an allowlist, blocking protected address ranges, or limiting accessible protocols.
This maps to CWE-918: Server-Side Request Forgery, in which an attacker causes a server to make requests to unintended resources from a position that may have greater network access than the attacker.
Potential impact
- An attacker may read responses from internal-only services
- The vulnerability could expose cloud metadata or other network-restricted resources
- Internal applications may receive unauthorized requests from a trusted server location
- Network reconnaissance and lateral movement may become easier
- Sensitive information may be disclosed through returned response data
General mitigation guidance
Mitigation generally focuses on reducing trust in client-controlled destinations and restricting the server's outbound network access.
Common defensive patterns include:
- Permit outbound requests only to explicitly approved destinations
- Validate and normalize hostnames, schemes, ports, and resolved addresses
- Block loopback, link-local, private, reserved, and metadata-service address ranges
- Revalidate destinations after DNS resolution and across redirects
- Limit supported protocols and disable unnecessary outbound connectivity
- Avoid returning raw upstream responses to untrusted callers
- Run the application with least-privilege network permissions and segmented egress policies
How teams detect issues like this
Organizations commonly detect SSRF risks through:
- Static analysis for HTTP clients receiving URLs or hosts from request data
- Code review checks for missing destination allowlists and redirect controls
- Dynamic testing with private, loopback, link-local, and metadata address cases
- Egress monitoring for unexpected connections from application servers
- Network policies that alert on or block access to protected address ranges
- Automated security review tools that identify user-controlled URL construction
