CVE-2011-4134 in FlexNet Publisher
Summary
by MITRE
Heap-based buffer overflow in lmadmin in Flexera FlexNet Publisher 11.10 (aka FlexNet License Server Manager) allows remote attackers to execute arbitrary code via a crafted 0x2f packet.
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Analysis
by VulDB Data Team • 01/05/2025
The vulnerability identified as CVE-2011-4134 represents a critical heap-based buffer overflow within the lmadmin component of Flexera FlexNet Publisher 11.10, also known as the FlexNet License Server Manager. This flaw exists in the handling of network packets, specifically when processing a crafted 0x2f packet sent over the network. The vulnerability stems from inadequate input validation and bounds checking within the license server management software, which is widely deployed in enterprise environments for software licensing management and control.
The technical exploitation of this vulnerability occurs through a remote attack vector where an unauthenticated attacker can send a specially crafted 0x2f packet to the affected system. The lmadmin service, which manages license server operations, fails to properly validate the length of incoming data before copying it into a fixed-size heap buffer. This improper memory management creates a condition where the buffer overflow can overwrite adjacent memory locations, potentially allowing an attacker to manipulate the program's execution flow. The heap-based nature of the vulnerability means that the overflow affects dynamically allocated memory, making exploitation more complex but still highly effective for arbitrary code execution.
The operational impact of this vulnerability extends beyond simple remote code execution, as it can lead to complete system compromise when exploited successfully. Organizations relying on FlexNet Publisher for software licensing management face significant risks, including unauthorized access to sensitive licensing data, potential disruption of software deployment processes, and the possibility of establishing persistent backdoors within their networks. The vulnerability affects systems running FlexNet Publisher 11.10 across multiple platforms, making it particularly dangerous in enterprise environments where licensing servers often serve as critical infrastructure components. This vulnerability aligns with CWE-121, heap-based buffer overflow, and can be mapped to ATT&CK technique T1203, Exploitation for Client Execution, and T1059, Command and Scripting Interpreter, as successful exploitation would enable attackers to execute arbitrary commands on the compromised system.
Organizations should immediately implement mitigations including applying the vendor-provided patches, restricting network access to the affected service, and implementing network segmentation to limit exposure. The recommended approach involves disabling unnecessary network services, applying firewall rules to restrict access to the lmadmin port, and monitoring network traffic for suspicious 0x2f packet patterns. Additionally, system administrators should conduct thorough vulnerability assessments to identify all instances of the affected software and ensure proper patch management procedures are in place. The vulnerability demonstrates the critical importance of input validation and memory safety practices in network services, particularly those handling external communications, and serves as a reminder of the potential consequences when such fundamental security measures are absent from commercial software implementations.