CVE-2009-3673 in Windows
Summary
by MITRE
Microsoft Internet Explorer 7 and 8 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by accessing an object that (1) was not properly initialized or (2) is deleted, leading to memory corruption, aka "Uninitialized Memory Corruption Vulnerability."
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Analysis
by VulDB Data Team • 08/28/2021
The vulnerability identified as CVE-2009-3673 represents a critical memory corruption flaw affecting Microsoft Internet Explorer versions 7 and 8. This issue stems from improper handling of objects within the browser's memory management system, creating a pathway for remote code execution attacks that can be exploited by malicious actors. The vulnerability specifically targets the browser's object lifecycle management mechanisms, where objects that are either not properly initialized or have been deleted are accessed inappropriately, leading to unpredictable memory states and potential code execution.
From a technical perspective, this vulnerability operates as an uninitialized memory corruption issue that falls under CWE-457, which describes the use of uninitialized variables or memory locations. The flaw manifests when Internet Explorer attempts to access memory objects that have not been properly initialized or have already been freed from memory, creating conditions where attackers can manipulate memory contents to execute arbitrary code. This type of vulnerability is particularly dangerous because it can be triggered through web-based attacks without requiring user interaction, making it an ideal candidate for drive-by download scenarios.
The operational impact of this vulnerability extends beyond simple exploitation, as it provides attackers with a direct pathway to compromise systems running affected versions of Internet Explorer. When an attacker crafts malicious web content that triggers this memory corruption, they can potentially gain full control over the affected system, including the ability to install malware, steal sensitive data, or establish persistent access. The vulnerability's remote execution capability means that users can be compromised simply by visiting malicious websites, making it particularly dangerous in enterprise environments where users may inadvertently encounter such content.
Security professionals should note that this vulnerability aligns with ATT&CK technique T1203, which covers "Exploitation for Client Execution" and represents a common attack pattern where adversaries leverage browser vulnerabilities to execute malicious code. The remediation approach for this vulnerability requires immediate patching of affected systems, as Microsoft released security updates to address the memory handling issues in Internet Explorer 7 and 8. Organizations should also implement additional security measures including browser hardening, network-based protections, and user education to reduce the risk of exploitation. The vulnerability highlights the importance of proper memory management practices in web browsers and demonstrates how seemingly simple flaws in object lifecycle management can result in severe security consequences, making it a critical target for both immediate remediation and long-term security architecture improvements.