CVE-2013-3976 in Tivoli Storage FlashCopy Manager
Summary
by MITRE
The (1) Data Protection for Exchange component 6.1 before 6.1.3.4 and 6.3 before 6.3.1 in IBM Tivoli Storage Manager for Mail and the (2) FlashCopy Manager for Exchange component 2.2 and 3.1 before 3.1.1 in IBM Tivoli Storage FlashCopy Manager do not properly constrain mailbox contents during certain PST restore operations, which allows remote authenticated users to read the personal e-mail of other users in opportunistic circumstances by launching an e-mail client after an administrator performs a multiple-mailbox restore.
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Analysis
by VulDB Data Team • 05/09/2026
The vulnerability described in CVE-2013-3976 represents a critical access control flaw within IBM Tivoli Storage Manager components that directly impacts email security and data privacy. This issue affects specific versions of both the Data Protection for Exchange component and the FlashCopy Manager for Exchange component, creating a scenario where authenticated attackers can exploit improper mailbox content constraints during PST restore operations. The vulnerability stems from insufficient validation mechanisms that fail to properly isolate mailbox contents when multiple mailboxes are restored simultaneously, creating an opportunity for unauthorized information disclosure.
The technical flaw manifests in the improper handling of mailbox data during restore operations, specifically when administrators perform multiple-mailbox restores using PST files. During these operations, the system fails to adequately enforce access controls that would normally prevent one user's mailbox data from being exposed to another user's email client. This occurs because the restore process does not properly validate or constrain the mailbox boundaries, allowing the restored data to be accessible through opportunistic access patterns. The vulnerability is particularly dangerous because it requires minimal privileges - only authentication to the system is needed - and can be exploited through routine administrative procedures.
The operational impact of this vulnerability extends beyond simple information disclosure to encompass significant privacy violations and potential corporate espionage. When an administrator performs a multiple-mailbox restore operation, any authenticated user who subsequently launches their email client can inadvertently access mailbox contents belonging to other users. This creates a window of opportunity for malicious actors to gain unauthorized access to sensitive corporate communications, personal information, and potentially confidential business data. The vulnerability is particularly concerning in environments where administrators regularly perform restore operations and where multiple users access shared email systems, as the exposure can occur without any explicit malicious action beyond the initial restore process.
The security implications of CVE-2013-3976 align with CWE-284 Access Control Issues, specifically addressing insufficient access control mechanisms during data restoration processes. From an attack perspective, this vulnerability maps to several ATT&CK techniques including privilege escalation through access control bypass and credential access through exploitation of system vulnerabilities. The attack surface is particularly broad as it affects both the Data Protection for Exchange and FlashCopy Manager components, impacting organizations that rely on IBM's storage management solutions for email backup and recovery operations. Organizations implementing these solutions face a heightened risk of data leakage and compliance violations, particularly in regulated environments where email privacy and data protection are mandated by industry standards.
Mitigation strategies should focus on immediate patch application to the affected IBM Tivoli Storage Manager versions, specifically upgrading to the patched releases mentioned in the CVE description. Organizations should also implement additional access controls and monitoring around restore operations, particularly multiple-mailbox restores, to detect and prevent unauthorized access patterns. Network segmentation and privilege separation can help reduce the attack surface, while regular security assessments of backup and restore procedures should be conducted to identify similar access control weaknesses. The vulnerability highlights the importance of proper access control implementation during data recovery operations and underscores the need for comprehensive security testing of backup and restore functionality in enterprise storage management systems.