CVE-2026-43856 in ADAM-3600
Summary
by MITRE • 10/20/2026
A stack-based buffer overflow vulnerability in the FileProcess::CheckDir function could allow a remote authenticated attacker to achieve arbitrary code execution via a path longer than 1024 bytes.
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Analysis
by VulDB Data Team • 10/20/2026
The identified vulnerability represents a critical security flaw located within the FileProcess::CheckDir function, characterized as a stack-based buffer overflow. This type of memory corruption error occurs when data is written beyond the allocated boundaries of a fixed-size buffer on the call stack, overwriting adjacent memory locations including return addresses and saved frame pointers. In this specific instance, the vulnerability is triggered by providing an input path string that exceeds 1024 bytes in length. The function fails to perform adequate bounds checking or validation before copying the user-supplied path into a fixed-size buffer on the stack. This lack of proper boundary verification allows an attacker to control the memory layout of the application process, which is a fundamental prerequisite for achieving arbitrary code execution.
From an operational perspective, this vulnerability poses a severe risk because it can be exploited by remote authenticated attackers. The requirement for authentication suggests that while the attack surface is somewhat restricted compared to unauthenticated vulnerabilities, any compromised or stolen credentials could lead to complete system compromise. By carefully crafting the overflow payload, an attacker can overwrite the return address of the function with a pointer to shellcode injected into the buffer itself or elsewhere in memory. This allows the execution of arbitrary commands under the context and privileges of the vulnerable application process. Such exploitation can result in unauthorized access to sensitive data, modification of system configurations, installation of backdoors, or use of the compromised host as part of a larger botnet infrastructure.
The technical nature of this flaw aligns with Common Weakness Enumeration (CWE) identifiers such as CWE-120: Buffer Copy without Checking Size of Input and CWE-787: Out-of-bounds Write on Stack. These classifications highlight the failure to validate input length against buffer capacity, a classic error in systems programming often found in C or C++ applications where manual memory management is required but safety checks are omitted for performance reasons or oversight. The specific mechanism involves manipulating the stack frame during function execution, which disrupts the control flow of the program and redirects instruction pointers to attacker-controlled code segments.
In terms of adversary tactics, this vulnerability maps directly to MITRE ATT&CK techniques related to initial access and privilege escalation. Specifically, it relates to T1059: Command and Scripting Interpreter if used for immediate execution, or more broadly to exploitation frameworks that leverage memory corruption vulnerabilities like CVE-2024-XXXXX (placeholder) to gain footholds in enterprise environments. Attackers typically utilize exploit kits or custom scripts to send the malformed path request through authenticated API endpoints or file processing interfaces exposed by the service hosting this function.
Mitigation strategies must address both immediate remediation and long-term architectural improvements. The primary fix involves modifying the FileProcess::CheckDir function to implement strict input validation, ensuring that any incoming path string is truncated or rejected if it exceeds 1024 bytes before being copied into the stack buffer. Developers should replace unsafe standard library functions like strcpy with safer alternatives such as strncpy or strlcpy, which enforce length limits. Additionally, enabling compiler-level security features can provide defense-in-depth measures against exploitation even if vulnerabilities remain present in older codebases. These include Stack Canaries (Stack Protection), Address Space Layout Randomization (ASLR) to make predicting memory addresses difficult for attackers, and Data Execution Prevention (DEP or NX bit) which prevents the execution of code stored on the stack. Regular static analysis scanning using tools like Coverity or SonarQube can help identify similar patterns in other parts of the codebase before deployment.