CVE-2018-25265 in LanSpy
Summary
by MITRE • 04/22/2026
LanSpy 2.0.1.159 contains a local buffer overflow vulnerability in the scan section that allows local attackers to execute arbitrary code by exploiting structured exception handling mechanisms. Attackers can craft malicious payloads using egghunter techniques to locate and execute shellcode, triggering code execution through SEH chain manipulation and controlled jumps.
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Analysis
by VulDB Data Team • 04/22/2026
The vulnerability under examination represents a critical local buffer overflow flaw within LanSpy version 2.0.1.159 specifically within its scan functionality section. This issue stems from inadequate input validation and memory management practices that permit attackers to overwrite adjacent memory structures through carefully crafted inputs. The vulnerability manifests when the application processes user-supplied data during scanning operations, creating an exploitable condition that can be leveraged by local adversaries with system-level access. The flaw directly impacts the application's structured exception handling mechanisms, which serve as the foundation for the exploitation process. According to common weakness enumeration standards, this vulnerability maps to cwe-121 which describes stack-based buffer overflow conditions that occur when insufficient bounds checking is performed on buffer operations. The attack vector requires local system access and leverages the application's existing exception handling infrastructure to achieve code execution.
The technical exploitation mechanism relies on structured exception handling chain manipulation to redirect program execution flow. Attackers utilize egghunter techniques to locate valid memory regions where their shellcode has been injected, enabling the discovery of the payload even when it resides in non-executable memory segments. This approach exploits the application's handling of structured exceptions by manipulating the exception handler chain to redirect execution to the attacker-controlled code. The exploitation process involves crafting malicious input that triggers the buffer overflow condition, followed by precise manipulation of the stack frame and exception handling structures. The SEH chain manipulation technique allows attackers to bypass modern exploit mitigation techniques such as stack canaries and address space layout randomization by directly controlling the exception handling flow. The controlled jumps within the execution path enable the attacker to execute shellcode that has been strategically placed within the application's memory space.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with complete system compromise capabilities. Local attackers can leverage this vulnerability to escalate privileges, modify system configurations, access sensitive data, and potentially establish persistent backdoors within the affected system. The exploitation requires minimal privileges since the vulnerability exists within a local application context, making it particularly dangerous for environments where multiple users share the same system resources. The vulnerability affects systems running LanSpy 2.0.1.159 and potentially other versions within the same release branch, creating widespread exposure across various deployment scenarios. Organizations utilizing this application in enterprise environments face significant risk as the vulnerability can be exploited by malicious insiders or compromised local accounts, leading to potential data breaches and system compromise. The attack surface is further expanded by the application's legitimate use cases, which often require elevated privileges and system-level access.
Mitigation strategies for this vulnerability encompass multiple layers of defense including immediate patching of the LanSpy application to the latest version that contains the relevant security fixes. System administrators should implement strict access controls and privilege separation to limit local user access to potentially vulnerable applications. Network segmentation and application whitelisting policies can prevent unauthorized execution of vulnerable binaries and reduce the attack surface. Memory protection mechanisms such as data execution prevention and address space layout randomization should be enabled to make exploitation more difficult. Additionally, regular security audits and vulnerability assessments should be conducted to identify similar issues within other applications. The implementation of intrusion detection systems can help identify exploitation attempts by monitoring for anomalous behavior patterns associated with buffer overflow exploitation techniques. Organizations should also consider deploying exploit prevention tools and endpoint protection solutions that can detect and block known exploitation patterns. Security awareness training for system administrators and developers can help prevent the introduction of similar vulnerabilities in future application development cycles. Compliance with industry standards such as iso 27001 and nist cybersecurity framework should include specific controls for managing local privilege escalation vulnerabilities and maintaining secure application configurations.