CVE-2017-2091 in Garoon
Summary
by MITRE
Cybozu Garoon 3.0.0 to 4.2.3 allows remote authenticated attackers to bypass access restriction in Phone Messages function to alter the status of phone messages via unspecified vectors.
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Analysis
by VulDB Data Team • 12/21/2020
The vulnerability identified as CVE-2017-2091 affects Cybozu Garoon versions 3.0.0 through 4.2.3, representing a significant access control flaw that undermines the security posture of this collaboration platform. This issue specifically targets the Phone Messages function within the application, where authenticated attackers can exploit a weakness to circumvent intended access restrictions. The vulnerability exists in the authorization mechanisms that govern user permissions within the phone messaging system, creating a pathway for malicious actors to manipulate phone message statuses without proper authorization.
The technical implementation of this vulnerability stems from insufficient input validation and inadequate access control enforcement within the Phone Messages module. Attackers who have authenticated access to the system can leverage unspecified vectors to modify phone message statuses, effectively bypassing the intended security controls that should prevent unauthorized alterations to communication records. This flaw operates at the application level where proper authentication checks fail to adequately validate user privileges before allowing modifications to sensitive phone message data. The vulnerability classification aligns with CWE-285, which addresses improper authorization issues in software systems, where the system fails to properly enforce access control policies for specific resources.
The operational impact of this vulnerability extends beyond simple data manipulation, as it enables attackers to potentially disrupt communication workflows and compromise the integrity of phone message records within the organization. An attacker could alter message statuses to hide important communications, mark legitimate messages as read or deleted, or manipulate the system's messaging queue to create confusion among users. This capability represents a serious threat to business continuity and information integrity, particularly in environments where phone message tracking and status monitoring are critical for operational efficiency. The vulnerability affects organizations using Cybozu Garoon as their primary collaboration platform, potentially exposing sensitive business communications to unauthorized modifications.
Mitigation strategies for CVE-2017-2091 should focus on immediate patching of affected versions and implementation of enhanced access control measures. Organizations should prioritize updating to versions of Cybozu Garoon that have addressed this vulnerability, as no official patches were provided for the affected versions. Network segmentation and monitoring of phone messaging functions can help detect unauthorized access attempts and modifications. The vulnerability demonstrates the importance of principle of least privilege implementation and proper authorization checks, as outlined in the mitre attack framework under technique T1078 for valid accounts and T1566 for credential access. Additional security controls such as multi-factor authentication and regular access privilege reviews can help minimize the risk of exploitation, while logging and auditing of phone message status changes should be implemented to detect potential abuse of this vulnerability.