CVE-2017-2095 in Garoon
Summary
by MITRE
Cybozu Garoon 3.0.0 to 4.2.3 allows remote authenticated attackers to bypass access restriction in the mail function leading to an alteration of the order of mail folders via unspecified vectors.
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Analysis
by VulDB Data Team • 12/21/2020
The vulnerability identified as CVE-2017-2095 affects Cybozu Garoon versions 3.0.0 through 4.2.3, representing a critical access control flaw that undermines the security posture of this collaboration platform. This issue manifests within the mail function component where authenticated users can exploit a weakness to circumvent established access restrictions, thereby gaining unauthorized capabilities that extend beyond their intended privileges. The vulnerability specifically enables attackers to manipulate the ordering of mail folders, which represents a significant compromise in data integrity and user privacy controls.
The technical implementation of this vulnerability stems from inadequate input validation and insufficient access control mechanisms within the mail folder management functionality. Attackers leveraging this flaw can manipulate folder ordering parameters through unspecified vectors that likely involve crafted requests or manipulated session data. This weakness falls under the broader category of privilege escalation and access control bypass vulnerabilities, which are commonly classified under CWE-284 Access Control and CWE-276 Incorrect Permissions. The vulnerability's impact extends beyond simple data manipulation as it allows for potential information disclosure through folder reordering that may obscure important messages or create confusion in mail organization.
The operational impact of this vulnerability is substantial for organizations relying on Cybozu Garoon for email and collaboration services. Remote authenticated attackers who successfully exploit this vulnerability can alter mail folder structures in ways that may hide critical communications or disrupt user workflows. This manipulation could lead to information loss where important emails become inaccessible due to reordering, or conversely, sensitive information could be exposed through strategic folder arrangement. The security implications extend to potential data integrity violations and user trust degradation, as users may lose confidence in the reliability of their email organization and access controls.
Organizations utilizing affected versions of Cybozu Garoon should immediately implement mitigations including updating to the latest available version that addresses this vulnerability, implementing additional access controls and monitoring for unusual folder manipulation activities, and conducting thorough security assessments of their collaboration platform. Network segmentation and monitoring of mail function access patterns can help detect potential exploitation attempts. This vulnerability aligns with ATT&CK technique T1078 Valid Accounts, as it requires authenticated access to exploit, and T1566 Phishing, as attackers may need to obtain valid credentials through social engineering to leverage this access control bypass. The remediation process should include comprehensive testing of updated software to ensure that the fix properly addresses the underlying access control mechanisms while maintaining system functionality.