CVE-2020-37010 in BearShare Lite
Summary
by MITRE • 01/29/2026
BearShare Lite 5.2.5 contains a buffer overflow vulnerability in the Advanced Search keywords input that allows attackers to execute arbitrary code. Attackers can craft a specially designed payload to overwrite the EIP register and execute shellcode by pasting malicious content into the search keywords field.
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Analysis
by VulDB Data Team • 01/29/2026
The vulnerability identified as CVE-2020-37010 resides within BearShare Lite version 5.2.5, a peer-to-peer file sharing application that has been deprecated but continues to pose security risks in legacy environments. This buffer overflow vulnerability specifically targets the Advanced Search functionality, demonstrating a classic software flaw that has persisted across numerous applications and systems. The vulnerability represents a critical security weakness that directly impacts the application's memory management and execution flow control mechanisms. The issue stems from inadequate input validation and bounds checking within the search keywords processing component, creating an exploitable condition that can be leveraged by malicious actors to compromise system integrity.
The technical flaw manifests through improper handling of user-supplied input in the Advanced Search keywords field, where the application fails to validate the length of input data before copying it into a fixed-size buffer. This oversight creates a condition where an attacker can provide input exceeding the allocated buffer space, leading to memory corruption that overwrites adjacent memory locations including the instruction pointer register. The vulnerability follows the common pattern of stack-based buffer overflows where the EIP register receives a corrupted value, allowing attackers to redirect program execution flow to malicious code. The exploitation process requires careful crafting of shellcode that can be executed when the program attempts to return from the vulnerable function, making this a sophisticated attack vector that demands precise payload construction and understanding of the target application's memory layout.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with a potential foothold for more extensive system compromise. When successfully exploited, the vulnerability allows remote code execution with the privileges of the affected application, potentially enabling attackers to install malware, establish backdoors, or perform data exfiltration. The attack surface is particularly concerning given that BearShare Lite operates in peer-to-peer networks where users may unknowingly interact with malicious content, and the vulnerability can be exploited through simple input manipulation without requiring elevated privileges or complex attack chains. This makes the vulnerability particularly dangerous in environments where legacy software remains operational, as it can be exploited by adversaries with minimal technical expertise to gain unauthorized access to systems.
Mitigation strategies for CVE-2020-37010 should prioritize immediate software updates or replacement, as the vulnerability affects a deprecated application version that no longer receives security patches. Organizations should implement network segmentation and access controls to limit exposure to vulnerable systems, while also monitoring for signs of exploitation attempts in network traffic logs. Input validation controls should be implemented at multiple layers including application-level filtering and network-based intrusion detection systems. The vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which is categorized under the broader weakness of inadequate input validation in software development practices. From an adversarial perspective, this vulnerability would be categorized under the ATT&CK technique T1059.007 Command and Scripting Interpreter: PowerShell, as attackers could leverage the code execution capability to deploy PowerShell-based payloads for further system compromise. Additionally, the vulnerability represents a persistent threat that could be exploited in lateral movement scenarios, particularly in environments where legacy applications remain operational and are not properly monitored for security vulnerabilities.