CVE-2015-8522 in Tivoli Storage Manager Fastback
Summary
by MITRE
Buffer overflow in the server in IBM Tivoli Storage Manager FastBack 5.5.x and 6.x before 6.1.12.2 allows remote attackers to execute arbitrary code via a crafted command, a different vulnerability than CVE-2015-8519, CVE-2015-8520, and CVE-2015-8521.
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Analysis
by VulDB Data Team • 02/03/2019
The vulnerability identified as CVE-2015-8522 represents a critical buffer overflow condition within the server component of IBM Tivoli Storage Manager FastBack software versions 5.5.x and 6.x prior to 6.1.12.2. This flaw resides in the handling of network commands received by the FastBack server daemon, creating an avenue for remote code execution that could be exploited by attackers without authentication. The vulnerability specifically affects the server-side processing logic where input validation fails to properly handle oversized data payloads, leading to memory corruption that can be leveraged to gain unauthorized control over the affected system.
The technical implementation of this buffer overflow stems from inadequate bounds checking within the command processing routines of the FastBack server. When the server receives a crafted command containing excessive data beyond the allocated buffer space, the overflow condition occurs in memory locations adjacent to the intended buffer, potentially overwriting critical program data structures, return addresses, or function pointers. This type of vulnerability maps directly to CWE-121, which describes heap-based buffer overflow conditions where insufficient validation allows attackers to write beyond allocated memory boundaries. The attack vector requires network access to the FastBack server ports, typically TCP 10000 or related administrative ports, making it particularly dangerous in networked environments where the server may be exposed to untrusted networks.
The operational impact of CVE-2015-8522 extends beyond simple remote code execution to encompass complete system compromise and potential data exfiltration capabilities. An attacker who successfully exploits this vulnerability could execute arbitrary code with the privileges of the FastBack server process, which typically runs with elevated system permissions. This scenario creates a significant risk for organizations relying on Tivoli Storage Manager FastBack for backup and recovery operations, as the compromised system could be used to manipulate backup data, access sensitive information stored in backup repositories, or establish persistent access points within the network infrastructure. The vulnerability's classification as a remote exploit means that attackers do not require physical access or local network presence to carry out successful attacks, making it particularly concerning for enterprise environments where backup servers may be exposed to broader network access.
Organizations affected by this vulnerability should prioritize immediate patch deployment to IBM Tivoli Storage Manager FastBack versions 6.1.12.2 or later, which contain the necessary fixes for the buffer overflow condition. The remediation process should include comprehensive testing of the updated software in staging environments before production deployment to ensure compatibility with existing backup operations. Network segmentation strategies should be implemented to limit direct access to FastBack server ports from untrusted networks, while firewall rules should restrict access to only authorized administrative systems. Security monitoring should be enhanced to detect unusual command patterns or connection attempts that might indicate exploitation attempts, with particular attention to the specific command structures that trigger the vulnerable code paths. From an ATT&CK framework perspective, this vulnerability aligns with techniques involving remote code execution and privilege escalation, potentially enabling adversaries to progress through multiple phases of the attack lifecycle including initial access, execution, privilege escalation, and persistence within the targeted environment.