CVE-2009-0812 in Hex Workshop
Summary
by MITRE
Stack-based buffer overflow in BreakPoint Software Hex Workshop 4.23, 6.0.1.4603, and other 6.x and earlier versions allows remote attackers to execute arbitrary code via a crafted Intel Hex Code (.hex) file. NOTE: some of these details are obtained from third party information.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 04/26/2025
The vulnerability identified as CVE-2009-0812 represents a critical stack-based buffer overflow flaw affecting BreakPoint Software Hex Workshop versions 4.23, 6.0.1.4603, and other 6.x and earlier releases. This security weakness stems from inadequate input validation mechanisms within the application's handling of Intel Hex Code files with the .hex extension. The flaw manifests when the software processes malformed or specially crafted hex files, creating conditions where attacker-controlled data can overwrite adjacent memory locations on the stack. Such buffer overflow conditions typically occur when the application attempts to write more data into a fixed-size memory buffer than it can accommodate, leading to potential memory corruption and arbitrary code execution capabilities. The vulnerability specifically impacts the file parsing functionality of the hex editor, making it susceptible to exploitation through maliciously constructed input files that could be delivered via email attachments, web downloads, or other means of file transfer.
From a technical perspective, this vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which describes a condition where data written to a stack buffer exceeds the buffer's allocated size, causing adjacent memory to be overwritten. The attack vector leverages the software's failure to properly validate the length and content of Intel Hex formatted data during file processing. When a user opens a crafted .hex file, the application's parser does not adequately check buffer boundaries, allowing an attacker to control the execution flow by overwriting return addresses, function pointers, or other critical stack memory locations. The vulnerability's remote exploitability means that attackers can trigger the condition without requiring local system access, making it particularly dangerous in environments where users might encounter malicious files through legitimate software usage patterns. This type of vulnerability typically requires the application to be running with sufficient privileges to execute code, often resulting in privilege escalation scenarios when exploited successfully.
The operational impact of CVE-2009-0812 extends beyond simple code execution, as it represents a significant threat to system integrity and user security. Organizations using affected versions of Hex Workshop face potential compromise through social engineering attacks where users might unknowingly open maliciously crafted hex files, leading to full system control by remote attackers. The vulnerability's presence in multiple versions indicates a persistent flaw in the software's architecture that was not adequately addressed through patching efforts. From an attacker's perspective, this vulnerability maps to several MITRE ATT&CK techniques including T1203 Exploitation for Client Execution and T1059 Command and Scripting Interpreter, as the successful exploitation allows for arbitrary code execution within the context of the vulnerable application. The impact is particularly severe because hex editors are commonly used tools in security research, forensics, and development environments, making the attack surface broader than typical user applications. System administrators and security professionals must consider that this vulnerability could be exploited in targeted attacks against security researchers or IT personnel who regularly handle hex files during their work processes.
Mitigation strategies for this vulnerability require immediate action to address the root cause through software updates and security hardening measures. The most effective approach involves upgrading to patched versions of BreakPoint Software Hex Workshop that properly implement input validation and buffer boundary checking mechanisms. Organizations should implement strict file validation policies that prevent users from opening untrusted hex files, particularly those received through email or downloaded from unverified sources. Network-based mitigations can include implementing file type restrictions and content inspection systems that identify and block potentially malicious hex files before they reach end-user systems. Security awareness training should emphasize the dangers of opening unknown files, even those with seemingly benign extensions like .hex. From a defensive perspective, application whitelisting solutions can help prevent execution of vulnerable software versions, while regular security assessments should verify that no systems remain running affected software. The vulnerability also highlights the importance of secure coding practices, particularly around buffer management and input validation, which should be incorporated into all software development lifecycle processes to prevent similar issues from occurring in future releases.