CVE-2009-2530 in Windows
Summary
by MITRE
Microsoft Internet Explorer 6, 6 SP1, 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," a different vulnerability than CVE-2009-2531.
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Analysis
by VulDB Data Team • 04/13/2025
This vulnerability represents a critical memory corruption flaw in Microsoft Internet Explorer versions 6, 6 SP1, 7, and 8 that stems from improper handling of objects in memory. The issue occurs when the browser encounters objects that either were not properly initialized or have been deleted, creating conditions where memory corruption can occur during object access operations. This fundamental flaw in memory management allows remote attackers to exploit the vulnerability by crafting malicious web content that triggers the specific memory access patterns leading to arbitrary code execution. The vulnerability is classified as an uninitialized memory corruption issue, distinct from similar vulnerabilities such as CVE-2009-2531, which demonstrates the complexity and specificity of memory-related security flaws in web browsers. From a cybersecurity perspective, this vulnerability exemplifies the dangers inherent in memory management errors within complex software applications, particularly those handling untrusted input from web environments.
The technical implementation of this vulnerability involves the browser's failure to properly validate object states before accessing them in memory. When Internet Explorer processes web content, it maintains various objects in memory that may be initialized, used, and subsequently deleted during normal operation. However, in this case, the browser fails to adequately check whether an object has been properly initialized or has been deleted from memory before attempting to access it. This leads to unpredictable memory behavior where attackers can manipulate the browser's memory access patterns to execute arbitrary code. The flaw typically manifests when the browser attempts to access a memory location that either contains uninitialized data or has been freed but not properly deallocated, creating opportunities for attackers to inject malicious code into the browser's execution context. This vulnerability aligns with CWE-457: Use of Uninitialized Variable, which specifically addresses the risks associated with accessing variables that have not been properly initialized.
The operational impact of this vulnerability is severe and far-reaching within enterprise and individual computing environments. Attackers can leverage this flaw by hosting malicious web content that, when viewed in affected Internet Explorer versions, triggers the memory corruption condition and executes attacker-controlled code on the victim's system. This allows for complete system compromise, enabling attackers to install malware, steal sensitive data, or establish persistent backdoors. The vulnerability affects multiple versions of Internet Explorer, making it particularly dangerous as it could impact a wide range of systems in organizations that had not yet migrated to newer browser versions. The remote exploitation nature means that simply visiting a compromised website could result in system compromise without any user interaction beyond normal web browsing. This vulnerability also represents a significant concern for organizations with legacy systems still using older Internet Explorer versions, as these systems become increasingly vulnerable to attacks that exploit such fundamental memory management flaws. From an attacker's perspective, this vulnerability maps to several ATT&CK techniques including T1059.001 (Command and Scripting Interpreter: PowerShell) and T1068 (Exploitation for Privilege Escalation) when combined with other attack vectors.
Mitigation strategies for this vulnerability require immediate action to address the underlying memory management issue. The most effective approach involves applying the Microsoft security update that specifically addresses this vulnerability, which provides patches to fix the uninitialized memory handling in Internet Explorer. Organizations should prioritize updating all affected systems to the latest available versions of Internet Explorer or migrate to supported browser versions that have fixed this memory corruption issue. Additionally, implementing network-level protections such as web application firewalls and content filtering solutions can help reduce the risk of exploitation by blocking malicious content before it reaches vulnerable systems. Browser security configurations should be hardened by disabling unnecessary features and implementing strict security policies that limit the execution of potentially malicious code. Regular security assessments and vulnerability scanning should be conducted to identify systems that may still be running vulnerable versions of Internet Explorer. Organizations should also consider implementing security awareness training to educate users about the risks of visiting untrusted websites and the importance of keeping browser software updated. The remediation process should include thorough testing of patches in controlled environments before widespread deployment to ensure compatibility with existing applications and systems. This vulnerability highlights the critical importance of maintaining up-to-date security patches and the risks associated with running unsupported software versions in enterprise environments.