CVE-2022-36079 in Parse Server
Summary
by MITRE • 09/08/2022
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Internal fields (keys used internally by Parse Server, prefixed by `_`) and protected fields (user defined) can be used as query constraints. Internal and protected fields are removed by Parse Server and are only returned to the client using a valid master key. However, using query constraints, these fields can be guessed by enumerating until Parse Server, prior to versions 4.10.14 or 5.2.5, returns a response object. The patch available in versions 4.10.14 and 5.2.5 requires the maser key to use internal and protected fields as query constraints. As a workaround, implement a Parse Cloud Trigger `beforeFind` and manually remove the query constraints.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 10/14/2022
CVE-2022-36079 represents a significant information disclosure vulnerability within Parse Server, a popular open source backend framework running on Node.js infrastructure. This vulnerability stems from the improper handling of internal and protected fields during query operations, creating a pathway for unauthorized enumeration attacks that can expose sensitive system metadata. The flaw exists in the query constraint validation mechanism where Parse Server previously allowed clients to use internal fields prefixed with underscores and user-defined protected fields as query parameters without proper authorization checks. This design oversight enables attackers to perform systematic enumeration attempts to discover and infer the existence of internal fields within the system, effectively bypassing the intended security boundaries that should only permit access to such fields through legitimate master key authentication.
The technical implementation of this vulnerability exploits the difference in response handling between authorized and unauthorized query operations. When clients attempt to query using internal or protected fields without proper master key authentication, Parse Server would return distinct response objects that contain clues about the existence of these fields. This behavior creates a side-channel attack vector where enumeration techniques can systematically test various field names and observe response variations to determine which internal fields are present in the system. The vulnerability specifically affects versions prior to 4.10.14 and 5.2.5, where the patch introduces mandatory master key verification before allowing internal and protected fields to be used as query constraints. This change aligns with security principle CWE-200, which addresses information exposure through improper error handling and response differentiation that reveals system internals.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables attackers to gain insights into the internal structure and implementation details of Parse Server deployments. This information can significantly aid in crafting more sophisticated attacks, including potential privilege escalation attempts or targeted exploitation of other vulnerabilities within the system. The vulnerability particularly affects organizations that rely on Parse Server for backend services, as it undermines the fundamental security model that separates internal system metadata from user-accessible data. Attackers can leverage this weakness to map the internal field structure of their applications, potentially identifying sensitive data patterns or system configurations that would otherwise remain hidden. The security implications are compounded by the fact that this vulnerability operates at the query level, making it difficult to detect through traditional network monitoring approaches since legitimate queries appear normal.
Organizations can implement multiple mitigation strategies to address this vulnerability effectively. The recommended approach involves upgrading to Parse Server versions 4.10.14 or 5.2.5, which enforce master key requirements for internal field queries, thereby closing the enumeration pathway. For environments where immediate upgrades are not feasible, implementing a Parse Cloud Trigger named `beforeFind` provides a viable workaround that manually validates and removes unauthorized query constraints before processing. This approach aligns with ATT&CK technique T1078.004, which involves Valid Accounts and Credential Access, by ensuring that only properly authenticated requests can access sensitive internal fields. Additionally, organizations should implement comprehensive monitoring and logging of query operations to detect anomalous enumeration patterns that may indicate attempted exploitation. Security teams should also conduct regular audits of their Parse Server configurations to ensure that internal field access is properly restricted and that master key usage is appropriately enforced throughout the system. The vulnerability underscores the importance of proper input validation and the principle of least privilege in backend systems, where internal implementation details should never be exposed through response variations or inconsistent access controls.