CVE-2022-31089 in Parse Server
Summary
by MITRE • 06/28/2022
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. In affected versions certain types of invalid files requests are not handled properly and can crash the server. If you are running multiple Parse Server instances in a cluster, the availability impact may be low; if you are running Parse Server as single instance without redundancy, the availability impact may be high. This issue has been addressed in versions 4.10.12 and 5.2.3. Users are advised to upgrade. There are no known workarounds for this issue.
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Analysis
by VulDB Data Team • 07/16/2022
The CVE-2022-31089 vulnerability affects Parse Server, a popular open-source backend framework designed for Node.js environments that enables developers to build mobile and web applications quickly. This vulnerability represents a critical availability risk that stems from improper handling of invalid file requests within the server's processing pipeline. The flaw specifically manifests when the system encounters certain malformed or invalid file requests that are not properly sanitized or rejected during the parsing phase, leading to unexpected server termination and complete service disruption.
The technical implementation of this vulnerability resides in the file processing logic of Parse Server where the application fails to adequately validate incoming file requests before attempting to parse or process them. When malformed requests are received, the system does not implement proper error handling mechanisms that would allow it to gracefully reject or log such requests rather than allowing them to cause a complete server crash. This represents a classic example of inadequate input validation and error handling that falls under CWE-20, which specifically addresses "Improper Input Validation" and CWE-707, addressing "Improper Neutralization of Input During Web Page Generation." The vulnerability essentially creates a denial of service condition where an attacker can craft specific invalid file requests that will cause the Parse Server instance to terminate unexpectedly.
From an operational perspective, the impact of this vulnerability varies significantly based on the deployment architecture of the Parse Server instance. In clustered environments where multiple Parse Server instances operate in parallel, the availability impact is relatively low since the failure of one instance can be mitigated by the remaining healthy instances in the cluster. However, in single-instance deployments without redundancy, the impact becomes severe and potentially catastrophic, as the entire backend service becomes unavailable until the server is manually restarted or recovered. This vulnerability directly aligns with ATT&CK technique T1499.004, which covers "Endpoint Denial of Service," and represents a significant threat to business continuity and application availability in production environments.
The remediation for this vulnerability requires immediate upgrading of Parse Server installations to versions 4.10.12 or 5.2.3, which contain the necessary patches to properly handle invalid file requests and prevent server crashes. These patched versions implement improved input validation and error handling mechanisms that ensure malformed requests are properly rejected without causing system instability. Security practitioners should also consider implementing additional monitoring and logging controls to detect unusual file request patterns that might indicate exploitation attempts, while maintaining proper backup and recovery procedures to minimize downtime in case of unexpected service interruptions. The vulnerability highlights the importance of robust error handling in backend services and demonstrates how seemingly simple input validation issues can lead to significant availability problems in critical infrastructure components.