CVE-2006-6596 in HyperAccess
Summary
by MITRE
HyperAccess 8.4 allows user-assisted remote attackers to execute arbitrary vbscript and commands via a session (HAW) file, which can be automatically opened using Internet Explorer.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 08/10/2018
The vulnerability identified as CVE-2006-6596 affects HyperAccess 8.4, a terminal emulation software that enables users to connect to mainframe and legacy systems. This issue represents a classic file handling vulnerability where the software fails to properly validate or sanitize session files before execution. The vulnerability specifically manifests when HyperAccess processes HAW session files that contain embedded VBScript code, creating a dangerous execution chain that can be exploited by remote attackers.
The technical flaw resides in the improper handling of session files within HyperAccess 8.4, where the application automatically executes VBScript commands contained within HAW files without sufficient input validation or sandboxing mechanisms. When Internet Explorer encounters a malicious HAW file, it can trigger the automatic execution of embedded VBScript code, which may include malicious commands designed to compromise the target system. This vulnerability operates under the CWE-74 principle of Improper Neutralization of Special Elements in Output Used by a Downstream Component, specifically in the context of command injection and code execution through file processing.
The operational impact of this vulnerability is significant as it enables user-assisted remote code execution, meaning that an attacker must convince a user to open a specially crafted HAW file, but once executed, the malicious code can run with the privileges of the victim user. The attack vector through Internet Explorer amplifies the risk as it leverages the browser's automatic handling of file associations and the trust users place in their web browsing environment. This vulnerability can lead to complete system compromise, data exfiltration, and persistent access to network resources.
Organizations should implement multiple layers of defense to mitigate this vulnerability, including disabling automatic execution of session files, implementing strict file type validation, and ensuring proper patching of HyperAccess installations. The mitigation strategy should align with ATT&CK technique T1059.005 for Command and Scripting Interpreter, emphasizing the importance of controlling file execution and restricting the ability of malicious scripts to execute within the system environment. Additionally, user education regarding the dangers of opening unknown session files and network segmentation to limit lateral movement should be implemented as part of comprehensive security measures.