CVE-2015-8485 in Office
Summary
by MITRE
Cybozu Office 9.9.0 through 10.3.0 allows remote authenticated users to bypass intended access restrictions and read arbitrary posting titles via unspecified vectors, a different vulnerability than CVE-2015-8484, CVE-2015-8486, and CVE-2016-1152.
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Analysis
by VulDB Data Team • 07/30/2018
The vulnerability identified as CVE-2015-8485 affects Cybozu Office versions 9.9.0 through 10.3.0, representing a critical access control flaw that enables remote authenticated users to circumvent intended security restrictions. This vulnerability specifically allows attackers to read arbitrary posting titles within the system, which constitutes a significant breach of information confidentiality and access control mechanisms. The flaw operates through unspecified vectors that differ from related vulnerabilities CVE-2015-8484, CVE-2015-8486, and CVE-2016-1152, indicating a distinct exploitation pathway within the application's security architecture. The affected system represents a collaborative office platform that likely handles sensitive business communications and document sharing, making unauthorized access to posting titles particularly concerning for organizations relying on such systems for internal operations.
The technical implementation of this vulnerability stems from inadequate access control validation mechanisms within the Cybozu Office application. Authentication users can potentially exploit this flaw to retrieve posting titles that should normally be restricted based on user permissions, group memberships, or content ownership. This type of vulnerability typically manifests when the application fails to properly verify user privileges before granting access to specific content elements. The unspecified vectors suggest that the flaw could be triggered through various attack paths including but not limited to API calls, web interface interactions, or direct protocol manipulation. The vulnerability's classification aligns with CWE-285, which addresses improper authorization issues in software systems, and represents a clear violation of the principle of least privilege that should govern access to information resources.
The operational impact of CVE-2015-8485 extends beyond simple information disclosure, as unauthorized access to posting titles can provide attackers with valuable reconnaissance data about organizational activities, project structures, and potentially sensitive business information. Attackers may use this information to plan more sophisticated attacks, identify high-value targets within the organization, or exploit additional vulnerabilities that might be related to the disclosed posting information. The vulnerability affects organizations using Cybozu Office in enterprise environments where the system likely handles confidential business communications, project management data, and collaborative content that requires proper access controls. The remote nature of the vulnerability means that attackers can exploit it from outside the organization's network without requiring physical access or direct system compromise, making it particularly dangerous for organizations with limited network segmentation or robust perimeter defenses.
Organizations affected by this vulnerability should immediately implement mitigations including applying the latest security patches from Cybozu, implementing network segmentation to limit access to the vulnerable application, and conducting thorough access control reviews to identify potential unauthorized access patterns. Security teams should also consider implementing monitoring solutions that can detect anomalous access patterns or unusual data retrieval activities that might indicate exploitation attempts. The vulnerability's relationship to other CVEs in the same timeframe suggests potential for coordinated attacks or similar underlying architectural weaknesses that should be addressed comprehensively. Organizations should also review their incident response procedures to ensure they can effectively detect and respond to exploitation attempts targeting this type of access control vulnerability. The flaw demonstrates the importance of maintaining up-to-date security measures and implementing proper access control validation mechanisms throughout application development and deployment processes.