CVE-2024-22263 in Spring Cloud Skipper
Summary
by MITRE • 06/19/2024
Spring Cloud Data Flow is a microservices-based Streaming and Batch data processing in Cloud Foundry and Kubernetes. The Skipper server has the ability to receive upload package requests. However, due to improper sanitization for upload path, a malicious user who has access to skipper server api can use a crafted upload request to write arbitrary file to any location on file system, may even compromises the server.
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Analysis
by VulDB Data Team • 06/20/2024
The vulnerability identified as CVE-2024-22263 affects Spring Cloud Data Flow's Skipper server component which serves as a platform for managing and orchestrating streaming and batch data processing applications in cloud environments. This system operates within Cloud Foundry and Kubernetes deployments, making it a critical component for enterprise data processing workflows. The Skipper server functionality includes package upload capabilities that allow users to deploy application packages to the data flow platform, establishing a legitimate attack surface that requires careful security consideration.
The technical flaw stems from inadequate input validation and path sanitization within the file upload mechanism of the Skipper server. When processing upload requests, the system fails to properly validate or sanitize the file paths provided by clients, creating a path traversal vulnerability that allows attackers to manipulate the destination where uploaded files are stored. This improper sanitization enables attackers to craft malicious upload requests that can write files to arbitrary locations on the target file system, bypassing normal access controls and directory restrictions that should normally protect the server's file system integrity.
The operational impact of this vulnerability is severe and potentially catastrophic for affected systems. An attacker with legitimate access to the Skipper server API can exploit this weakness to write malicious files to critical system locations, potentially including system binaries, configuration files, or other sensitive directories. This arbitrary file writing capability could enable attackers to compromise the entire server by installing backdoors, modifying system components, or injecting malicious code that persists across system restarts. The vulnerability essentially provides an attacker with a mechanism to escalate privileges and gain persistent access to the underlying infrastructure hosting the data processing platform.
This vulnerability aligns with CWE-22 Path Traversal and CWE-73 Path Traversal, representing a classic file system traversal attack that allows unauthorized file operations. From an adversarial perspective, this flaw maps to multiple ATT&CK techniques including T1059 Command and Scripting Interpreter and T1078 Valid Accounts, as attackers would need legitimate API access to exploit the vulnerability but could then use it to establish persistent access. Organizations should implement immediate mitigations including strict input validation for all file upload paths, implementing proper path sanitization routines, and restricting API access to only authorized users. Additional protective measures should include filesystem permissions hardening, monitoring for unusual file creation patterns, and implementing network segmentation to limit access to the Skipper server API to trusted components only.