CVE-2015-4933 in Tivoli Storage Manager Fastback
Summary
by MITRE
Stack-based buffer overflow in the server in IBM Tivoli Storage Manager FastBack 6.1 before 6.1.12.1 allows remote attackers to execute arbitrary code via a crafted packet, a different vulnerability than CVE-2015-4931, CVE-2015-4932, CVE-2015-4934, and CVE-2015-4935.
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Analysis
by VulDB Data Team • 06/07/2022
The vulnerability identified as CVE-2015-4933 represents a critical stack-based buffer overflow flaw within the server component of IBM Tivoli Storage Manager FastBack version 6.1 prior to 6.1.12.1. This vulnerability exists in the network communication handling mechanisms of the storage management software, specifically when processing incoming packets from remote clients. The flaw stems from inadequate input validation and bounds checking within the server's packet processing routines, creating an exploitable condition where maliciously crafted network traffic can trigger memory corruption. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, which occurs when more data is written to a fixed-length buffer located on the stack than the buffer can accommodate, leading to overwrite of adjacent memory locations including return addresses and function pointers.
The operational impact of this vulnerability extends beyond simple code execution, as it provides remote attackers with the capability to gain arbitrary code execution privileges on affected systems. Attackers can leverage this vulnerability by sending specially crafted packets to the FastBack server, potentially allowing them to escalate privileges, install malware, or establish persistent access to the storage infrastructure. The attack surface is particularly concerning given that FastBack servers typically operate in enterprise environments where they manage critical backup and recovery operations, making them attractive targets for adversaries seeking to disrupt business continuity or access sensitive data. This vulnerability differs from related issues CVE-2015-4931 through CVE-2015-4935, indicating distinct code paths and exploitation vectors that require separate remediation approaches.
From a cybersecurity perspective, this vulnerability aligns with tactics described in the MITRE ATT&CK framework under T1059 for command and script injection, as successful exploitation would enable adversaries to execute arbitrary commands on the compromised system. The vulnerability also maps to techniques involving privilege escalation and persistence mechanisms, as attackers could use the arbitrary code execution capability to install backdoors or modify system configurations. Organizations running affected versions of IBM Tivoli Storage Manager FastBack face significant risk of unauthorized access to their backup infrastructure, potentially compromising the integrity and availability of critical data protection systems. The stack-based nature of the buffer overflow makes exploitation relatively straightforward for skilled attackers, as it typically requires only careful crafting of input data to overwrite the instruction pointer and redirect execution flow.
The recommended mitigation strategy involves immediate deployment of IBM's security patches and updates for FastBack version 6.1.12.1, which address the buffer overflow conditions through proper input validation and memory boundary checks. Network segmentation and firewall rules should be implemented to restrict access to FastBack server ports from untrusted networks, reducing the attack surface. Additionally, organizations should conduct comprehensive vulnerability assessments to identify any other potentially affected systems within their infrastructure and implement network monitoring to detect anomalous packet patterns that might indicate exploitation attempts. Regular security updates and patch management processes should be strengthened to ensure timely deployment of security fixes across all enterprise storage management systems. The vulnerability serves as a reminder of the importance of proper memory management practices in network services and the critical need for robust input validation to prevent exploitation of buffer overflow conditions in enterprise storage infrastructure.