CVE-2015-6520 in IPPUSBXD
Summary
by MITRE
IPPUSBXD before 1.22 listens on all interfaces, which allows remote attackers to obtain access to USB connected printers via a direct request.
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Analysis
by VulDB Data Team • 11/18/2024
The vulnerability identified as CVE-2015-6520 affects the IPPUSBXD driver component used in Windows operating systems for managing USB printer connections. This driver facilitates communication between USB printers and the Windows printing subsystem through the Internet Printing Protocol over USB. The flaw resides in the driver's network listening behavior where it binds to all available network interfaces rather than restricting connections to localhost or specific trusted interfaces. This design oversight creates a significant security exposure that directly violates the principle of least privilege and network segmentation best practices.
The technical implementation of this vulnerability stems from the driver's failure to properly restrict network access controls during its operation. When IPPUSBXD operates with default configurations, it opens listening sockets on all network interfaces, making USB printer connections accessible from any remote system that can reach the host machine. This behavior creates an attack surface that allows remote adversaries to directly connect to USB printers through the network without requiring physical access to the device or knowledge of the local network topology. The vulnerability specifically affects systems running Windows versions where this driver is present and active, with the issue being resolved in version 1.22 of the driver.
The operational impact of this vulnerability extends beyond simple unauthorized access to printer functionality. Attackers can exploit this weakness to perform various malicious activities including printer enumeration, unauthorized print job submission, potential data exfiltration from printer memory, and in some cases, privilege escalation through printer driver vulnerabilities. The remote accessibility of USB printers through this channel creates a persistent threat vector that can be leveraged by attackers who have already gained network access to the target system. This vulnerability is particularly concerning in enterprise environments where network segmentation is expected to prevent lateral movement between different security zones, as the vulnerability effectively bypasses these controls by providing direct access to physical USB devices through network protocols.
Security professionals should consider this vulnerability in the context of the broader ATT&CK framework, particularly under the techniques related to network service scanning and lateral movement through networked devices. The vulnerability maps to CWE-284 which describes improper access control, specifically the lack of proper network interface restrictions. Organizations should implement immediate mitigations including updating to the patched version 1.22 of IPPUSBXD, configuring firewall rules to restrict access to relevant ports, and ensuring that USB printer access is properly segmented from general network traffic. Additionally, network administrators should monitor for unauthorized printer access attempts and consider disabling unnecessary USB printer sharing features in the Windows environment. The vulnerability demonstrates the importance of proper network service configuration and the need for regular security assessments of system components that handle network communications, particularly those that bridge physical and network security domains.
This vulnerability serves as a reminder of the critical importance of network interface binding controls in security-sensitive applications and the potential for seemingly benign system components to create significant security exposure points when misconfigured. The remediation efforts should include comprehensive security reviews of all network-facing services and proper implementation of the principle of least privilege to prevent similar issues from occurring in other system components.