CVE-2015-8486 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 report titles via unspecified vectors, a different vulnerability than CVE-2015-8484, CVE-2015-8485, and CVE-2016-1152.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 07/30/2018
The vulnerability identified as CVE-2015-8486 affects Cybozu Office versions 9.9.0 through 10.3.0, representing a significant access control flaw that enables remote authenticated users to circumvent intended security restrictions. This issue specifically permits unauthorized reading of arbitrary report titles, creating a persistent security weakness that undermines the application's integrity and data protection mechanisms. The vulnerability operates through unspecified vectors that differ from related issues CVE-2015-8484, CVE-2015-8485, and CVE-2016-1152, indicating a distinct attack surface that requires specific analysis and remediation approaches. The affected software environment represents a collaborative platform that typically handles sensitive business data, making this vulnerability particularly concerning from a cybersecurity perspective.
Technical exploitation of this vulnerability demonstrates a failure in the application's authorization controls, where authenticated users can manipulate access permissions to retrieve report titles they should not have visibility to. The flaw likely resides in the application's permission checking mechanisms or session management components that fail to properly validate user privileges before granting access to report data. This type of vulnerability falls under CWE-284, which specifically addresses improper access control issues in software applications. The attack vector requires authentication, meaning that an attacker must first obtain valid credentials before attempting to exploit this weakness, but once successful, the impact extends beyond simple privilege escalation to data exposure.
The operational impact of CVE-2015-8486 extends beyond immediate data leakage concerns to encompass broader security implications for organizations relying on Cybozu Office for business operations. When unauthorized users can access report titles, they gain intelligence about the organization's data structure and potentially sensitive business information, enabling more sophisticated attacks targeting specific data assets. The vulnerability creates a persistent threat that could allow attackers to map out the organization's reporting infrastructure and identify high-value targets for further exploitation. From an attacker's perspective, this represents a reconnaissance step that could lead to more severe compromises, as report titles often contain information about business processes, financial data, or strategic initiatives that could be leveraged for social engineering or targeted attacks.
Organizations should implement immediate mitigations including updating to patched versions of Cybozu Office, implementing additional access controls, and conducting thorough security assessments of their collaborative environments. The vulnerability's classification as a remote authenticated access control flaw aligns with ATT&CK technique T1078 which covers valid accounts and privilege escalation. Security teams should monitor for unauthorized access patterns and implement network segmentation to limit potential exploitation. Additionally, organizations should review their access control policies and ensure that report access is properly restricted based on user roles and business needs. The remediation process must include comprehensive testing to ensure that the patch does not introduce regressions in functionality while effectively addressing the access control bypass. Regular security audits and vulnerability assessments should be conducted to identify similar weaknesses in other applications within the organization's ecosystem, as this type of access control failure represents a common attack pattern that affects numerous enterprise collaboration platforms.