Summary
Kiteworks Email Protection Gateway contains a remote code execution vulnerability in its configuration import workflow. An authenticated administrator who can submit a crafted configuration may be able to cause arbitrary commands to execute on the gateway when the imported content is processed.
Affected context
The issue occurs in Email Protection Gateway deployments that allow authenticated administrators to import configuration data without sufficiently validating its contents before processing. Risk depends on the permissions granted to administrators, the gateway's configuration import workflow, and the privileges available to the service processing the imported data.
Exploit preconditions
- Attack surface: Authenticated configuration-import functionality
- Required access: Administrator-level access capable of submitting or importing configuration data
- Trigger point: Processing of the imported configuration by the gateway
- Why exploitation is possible: Insufficient validation may allow configuration content to influence command execution rather than being handled strictly as data
Why this happens
The underlying issue is inadequate validation and isolation of administrator-supplied configuration during import. When configuration content is processed in a context that permits command or code interpretation, crafted values may cross the boundary from data into executable behavior. This maps primarily to CWE-94: Improper Control of Generation of Code ('Code Injection'); the associated CWE-22 classification also indicates that unsafe path-related handling may be relevant to the configuration-processing flow.
Potential impact
- An attacker may execute arbitrary commands on the gateway
- The gateway's confidentiality, integrity, or availability could be compromised
- Sensitive email, configuration, or credential data may be accessed
- The compromised system could be used to affect connected services or infrastructure
General mitigation guidance
Mitigation generally focuses on ensuring imported configuration remains data-only throughout validation and processing.
Common defensive patterns include:
- Using strict allowlisted schemas and typed configuration models
- Rejecting unexpected fields, control characters, executable expressions, and unsafe path values
- Separating parsing, validation, and application so validation occurs before any side effects
- Avoiding shell interpretation and dynamic code evaluation for configuration values
- Applying canonical path checks and restricting file operations to dedicated directories
- Running configuration-processing services with least privilege and limited filesystem and network access
- Requiring protected administrative workflows, audit logging, and integrity controls for imported configurations
How teams detect issues like this
Detection approaches may include:
- Static analysis for command construction, shell invocation, dynamic evaluation, and unsafe path handling involving imported configuration values
- Code review checks confirming that schema validation precedes file, process, or network operations
- Tests using unexpected fields, path-like values, metacharacters, and type-confusion cases to verify rejection
- Runtime monitoring for unusual child processes, command execution, filesystem access, or outbound connections after configuration imports
- Policy enforcement requiring typed schemas, allowlisted configuration fields, and least-privilege service accounts
- Neutral automated code-review or software-composition tools to identify injection and input-validation patterns
