CVE-2020-37036 in RM Downloader
Summary
by MITRE • 01/31/2026
RM Downloader 2.50.60 contains a local buffer overflow vulnerability in the 'Load' parameter that allows attackers to execute arbitrary code by overwriting memory. Attackers can craft a malicious payload with an egg hunter technique to bypass memory protections and execute commands like launching calc.exe.
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Analysis
by VulDB Data Team • 01/31/2026
The CVE-2020-37036 vulnerability represents a critical local buffer overflow flaw in RM Downloader version 2.50.60 that demonstrates the dangerous consequences of improper input validation and memory management practices. This vulnerability exists within the application's handling of the 'Load' parameter, where insufficient bounds checking allows attackers to craft malicious input that exceeds the allocated buffer space. The flaw specifically manifests when the application processes user-supplied data without adequate sanitization, creating an exploitable condition that can be leveraged for arbitrary code execution. The vulnerability falls under the CWE-121 category of stack-based buffer overflow, which is classified as a fundamental memory safety issue that has plagued software development for decades.
The technical exploitation of this vulnerability involves crafting a malicious payload that carefully constructs input data to overwrite adjacent memory locations within the application's stack. Attackers utilize sophisticated techniques including the egg hunter method to bypass modern memory protection mechanisms such as DEP (Data Execution Prevention) and ASLR (Address Space Layout Randomization). The egg hunter technique works by creating a small piece of shellcode that searches for a specific pattern in memory, effectively locating and executing the actual payload. This approach allows attackers to circumvent stack canaries and other security measures that would otherwise prevent successful exploitation. The vulnerability demonstrates how attackers can leverage seemingly simple input handling flaws to achieve complex exploitation objectives.
The operational impact of CVE-2020-37036 extends beyond simple arbitrary code execution, as it provides attackers with persistent access to affected systems through the execution of commands such as launching calc.exe. This capability enables threat actors to establish footholds within networks, escalate privileges, and potentially deploy additional malware or establish backdoors. The local nature of the vulnerability means that attackers typically need physical access or user-level privileges to exploit it, but once successful, the consequences can be severe for system integrity and data confidentiality. The vulnerability also represents a significant risk to organizations that rely on RM Downloader for legitimate file management tasks, as it can be exploited by both external attackers and malicious insiders.
Mitigation strategies for CVE-2020-37036 should prioritize immediate patching of the affected RM Downloader version to address the underlying buffer overflow condition. Organizations should implement proper input validation and bounds checking mechanisms to prevent similar vulnerabilities from occurring in other applications. The implementation of modern security features such as stack canaries, ASLR, and DEP should be verified and enforced across all system components. Additionally, regular security testing including fuzzing and static code analysis should be conducted to identify and remediate similar memory corruption vulnerabilities. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1059.001 (Command and Scripting Interpreter: PowerShell) and T1068 (Exploitation for Privilege Escalation), highlighting the need for comprehensive defensive measures. Network segmentation and privilege separation can help limit the potential impact if exploitation occurs, while monitoring for unusual command execution patterns can aid in early detection of compromise.