CVE-2023-43793 in Misskey
Summary
by MITRE • 10/25/2023
Misskey is an open source, decentralized social media platform. Prior to version 2023.9.0, by editing the URL, a user can bypass the authentication of the Bull dashboard, which is the job queue management UI, and access it. Version 2023.9.0 contains a fix. There are no known workarounds.
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Analysis
by VulDB Data Team • 10/25/2023
The vulnerability identified as CVE-2023-43793 affects Misskey, an open source decentralized social media platform that operates on a federated model similar to other ActivityPub-based systems. This security flaw represents a critical authorization bypass issue that undermines the platform's administrative security controls. The vulnerability specifically targets the Bull dashboard component, which serves as a job queue management interface critical for system operations and monitoring. The Bull dashboard functionality is designed to provide administrators with visibility into background processes, scheduled tasks, and system queue management, making it a sensitive administrative interface that should remain protected from unauthorized access.
The technical exploitation of this vulnerability occurs through URL manipulation, which represents a classic path traversal or access control bypass attack vector. Attackers can manipulate the URL parameters to gain access to the Bull dashboard without proper authentication, effectively circumventing the platform's intended security controls. This type of vulnerability falls under CWE-285, which addresses improper authorization issues in software systems, and demonstrates how insufficient input validation and access control checks can lead to unauthorized administrative access. The vulnerability exists in versions prior to 2023.9.0, indicating that the developers were aware of the issue and implemented a fix in their subsequent release, though no workarounds were provided for affected versions.
The operational impact of this vulnerability is significant as it allows unauthorized users to access administrative interfaces that typically contain sensitive system information and control mechanisms. The Bull dashboard provides access to job queue management, which could potentially reveal system load patterns, scheduled maintenance windows, and background processing information that might aid in further attacks. This access could enable attackers to manipulate system processes, potentially causing service disruption or creating opportunities for privilege escalation. From an ATT&CK framework perspective, this vulnerability maps to T1078 Valid Accounts and T1566 Phishing, as unauthorized access to administrative interfaces could lead to further compromise of the system. The decentralized nature of Misskey means that compromise of one instance could potentially affect the broader federation, making this vulnerability particularly concerning for network administrators.
The fix implemented in version 2023.9.0 likely addresses the root cause by strengthening access controls and implementing proper authentication checks for the Bull dashboard interface. This fix aligns with security best practices for protecting administrative interfaces, which should always require proper authentication and authorization before granting access. Organizations running Misskey instances should immediately upgrade to version 2023.9.0 or later to remediate this vulnerability. System administrators should also conduct security reviews of their deployment configurations and ensure that all administrative interfaces are properly secured. The vulnerability demonstrates the importance of comprehensive access control testing and the need for regular security assessments of web applications, particularly those with administrative dashboards that handle sensitive system information. Given the nature of decentralized platforms, this vulnerability could potentially impact multiple instances across the network if not properly addressed.