CVE-2016-7801 in Garoon
Summary
by MITRE
Cybozu Garoon 3.0.0 to 4.2.2 allows remote attackers to bypass access restrictions to delete other users' To-Dos via unspecified vectors.
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Analysis
by VulDB Data Team • 12/26/2020
The vulnerability identified as CVE-2016-7801 affects Cybozu Garoon versions 3.0.0 through 4.2.2, representing a critical access control flaw that permits unauthorized remote exploitation. This issue stems from insufficient input validation and authorization checks within the application's todo management functionality, creating a pathway for malicious actors to manipulate the system's permission model. The vulnerability manifests when users can exploit unspecified vectors to delete todo items belonging to other users, effectively bypassing the intended access restrictions that should prevent such cross-user operations.
The technical implementation of this vulnerability demonstrates a classic authorization bypass scenario where the application fails to properly verify user permissions before executing delete operations on todo items. This flaw operates at the application logic level, suggesting that the authorization checks are either absent, incorrectly implemented, or can be circumvented through specific input manipulation techniques. The unspecified vectors indicate that the vulnerability may be exploitable through multiple attack surfaces including but not limited to API endpoints, web interface interactions, or potentially through crafted requests that manipulate session tokens or user context identifiers.
From an operational impact perspective, this vulnerability creates significant security risks for organizations utilizing Cybozu Garoon for collaborative work management and project tracking. The ability to delete other users' todo items can disrupt workflow processes, compromise data integrity, and potentially expose sensitive information about project timelines and user responsibilities. Attackers could leverage this vulnerability to create denial of service conditions by deleting critical todo items, manipulate project tracking data, or gain insights into organizational structures and user activities through the deletion patterns of todo items. The remote nature of the exploit means that attackers can target the system from external networks without requiring physical access or local system credentials.
Organizations should implement immediate mitigations including applying the vendor-provided patches or updates that address this authorization bypass vulnerability. Network segmentation and access controls should be strengthened to limit exposure of the Garoon application to untrusted networks. Additionally, monitoring systems should be configured to detect unusual deletion patterns in todo items, which could indicate exploitation attempts. The vulnerability aligns with CWE-285, which describes improper authorization issues in software systems, and represents a clear violation of the principle of least privilege. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation and defense evasion techniques, as attackers can maintain persistent access while avoiding detection through the deletion of audit trails or system artifacts. Organizations should also consider implementing comprehensive logging and audit trails for all todo management operations to facilitate incident response and forensic analysis in case of exploitation attempts.