CVE-2010-3031 in ThinOS HF
Summary
by MITRE
Buffer overflow in Wyse ThinOS HF 4.4.079i, and possibly other versions before ThinOS 6.5, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a long string to the LPD service.
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Analysis
by VulDB Data Team • 07/31/2024
The vulnerability identified as CVE-2010-3031 represents a critical buffer overflow flaw within Wyse ThinOS HF 4.4.079i and potentially earlier versions up to ThinOS 6.5. This issue specifically affects the Line Printer Daemon (LPD) service component of the operating system, which is designed to handle print job submissions over network connections. The vulnerability arises from insufficient input validation mechanisms within the LPD service implementation, creating a condition where maliciously crafted input data can exceed the allocated buffer space and overwrite adjacent memory regions. The affected system components operate at a low level within the network stack, making this vulnerability particularly dangerous as it can be exploited remotely without requiring local system access or authentication credentials.
The technical exploitation of this buffer overflow vulnerability occurs when an attacker sends a specially crafted string of excessive length to the LPD service port, typically port 515. When the service processes this malformed input, the insufficient bounds checking allows the data to overflow into adjacent memory locations, potentially corrupting program execution flow. This memory corruption can result in unpredictable behavior including application crashes, system instability, and in some cases arbitrary code execution within the context of the LPD service process. The vulnerability maps directly to CWE-121, which describes heap-based buffer overflow conditions, and CWE-125, which covers out-of-bounds read vulnerabilities. The attack surface is particularly concerning as the LPD service is often exposed to untrusted network environments and may be accessible to external attackers without authentication requirements.
From an operational impact perspective, this vulnerability creates significant risk for organizations utilizing Wyse ThinOS devices in enterprise environments. The remote code execution capability, while potentially limited by the service context, could allow attackers to gain persistent access to thin client devices and potentially escalate privileges within the network infrastructure. The denial of service aspect directly impacts business continuity by causing print services to become unavailable, which can disrupt critical workflows in environments where print functionality is essential. Organizations running legacy thin client deployments are particularly vulnerable as these systems often lack modern security features and may not receive regular security updates. The vulnerability aligns with ATT&CK technique T1203, which describes exploitation of remote services, and T1068, covering local privilege escalation through service exploitation.
Mitigation strategies for CVE-2010-3031 should prioritize immediate patching of affected systems with the latest Wyse ThinOS updates that address this buffer overflow condition. Network segmentation and firewall rules should be implemented to restrict access to the LPD service port 515, limiting exposure to only trusted internal networks. Security monitoring should be enhanced to detect unusual traffic patterns or attempted exploitation attempts targeting the LPD service. Organizations should also consider disabling the LPD service entirely if print job submission over network protocols is not required for their operational needs. Regular vulnerability assessments and penetration testing should be conducted to identify similar buffer overflow conditions in other network services and applications. The remediation approach should align with industry best practices for vulnerability management and security hardening as outlined in frameworks such as NIST SP 800-40 and ISO 27001 security controls.