CVE-2023-46278 in Remote Service
Summary
by MITRE • 11/01/2023
Uncontrolled resource consumption vulnerability in Cybozu Remote Service 4.1.0 to 4.1.1 allows a remote authenticated attacker to consume huge storage space or cause significantly delayed communication.
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Analysis
by VulDB Data Team • 11/24/2023
The vulnerability identified as CVE-2023-46278 represents a critical uncontrolled resource consumption flaw within Cybozu Remote Service versions 4.1.0 through 4.1.1. This issue falls under the category of resource exhaustion attacks where an authenticated remote adversary can manipulate system resources to create significant operational disruptions. The vulnerability stems from inadequate input validation and resource management mechanisms within the service's file handling and storage allocation processes. Attackers can exploit this weakness by submitting specially crafted requests that trigger excessive storage consumption or generate delayed communication responses, effectively degrading system performance and availability. The flaw particularly affects systems where the service manages large volumes of data or handles frequent user requests, making it a serious concern for organizations relying on Cybozu Remote Service for their operational infrastructure.
The technical implementation of this vulnerability involves the service's failure to properly validate or limit the size and number of files that can be uploaded or processed through its remote interface. When authenticated users submit requests containing oversized data payloads or malformed file structures, the system allocates excessive storage resources without proper bounds checking. This behavior manifests as either rapid storage space exhaustion or prolonged processing delays that can cascade into broader system performance degradation. The vulnerability operates at the application layer and requires authentication credentials to exploit, which means that unauthorized access attempts without valid credentials would be blocked by standard authentication mechanisms. However, once authenticated, attackers can leverage this flaw to consume resources at rates that exceed normal operational parameters, potentially leading to denial of service conditions.
From an operational impact perspective, this vulnerability creates multiple risk vectors that organizations must address immediately. The uncontrolled storage consumption can lead to complete system outages when storage capacity is exhausted, particularly affecting systems with limited disk space or those operating under strict storage quotas. Additionally, the delayed communication effects can cause cascading failures throughout dependent systems that rely on timely responses from the Cybozu Remote Service. The vulnerability's remote nature means that attackers can exploit it from outside the organization's network perimeter, making it particularly dangerous for systems with exposed remote access interfaces. Organizations using affected versions may experience service degradation, data loss, or complete service unavailability, depending on the scale and frequency of exploitation attempts. The impact extends beyond simple performance degradation to potentially compromise business continuity and regulatory compliance requirements for data availability.
Mitigation strategies for CVE-2023-46278 should focus on immediate patching of affected systems, combined with network-level controls and monitoring. Organizations must upgrade to Cybozu Remote Service versions that address this vulnerability, as provided by the vendor's security advisory. Network segmentation and access controls should be implemented to limit exposure of the affected service to only trusted users and systems. Input validation mechanisms should be enhanced to include size and format restrictions on file uploads and data processing requests. Monitoring systems should be configured to detect unusual resource consumption patterns or communication delays that may indicate exploitation attempts. The vulnerability aligns with CWE-400 which describes uncontrolled resource consumption, and may map to ATT&CK technique T1499.004 for resource exhaustion attacks. Additionally, implementing rate limiting and connection throttling mechanisms can help reduce the impact of exploitation attempts while maintaining legitimate service functionality. Regular security assessments and vulnerability scanning should be conducted to identify similar issues within the broader system infrastructure and ensure comprehensive protection against related attack vectors.