CVE-2007-3893 in Internet Explorer
Summary
by MITRE
Unspecified vulnerability in Microsoft Internet Explorer 5.01 through 7 allows remote attackers to execute arbitrary code via unspecified vectors involving memory corruption from an unhandled error.
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Analysis
by VulDB Data Team • 03/15/2021
Microsoft Internet Explorer versions 5.01 through 7 contained an unspecified memory corruption vulnerability that could be exploited by remote attackers to execute arbitrary code on affected systems. This vulnerability falls under the category of memory safety issues that represent a fundamental weakness in how the browser handles memory allocation and error conditions. The unspecified nature of the exact vectors suggests that multiple attack paths could potentially trigger the same underlying memory corruption flaw, making the vulnerability particularly dangerous as attackers could leverage various methods to exploit it. The vulnerability specifically involves an unhandled error condition that leads to memory corruption, which is a common pattern in browser exploits and aligns with the common weakness enumeration CWE-125, which deals with out-of-bounds read conditions. When Internet Explorer encounters an error condition that is not properly handled, the memory management system can become corrupted, potentially allowing attackers to inject and execute malicious code with the privileges of the user running the browser. The impact of this vulnerability extends beyond simple code execution as it represents a critical security flaw that could enable full system compromise. Attackers could craft malicious web pages or content that, when loaded in the vulnerable browser, would trigger the memory corruption and subsequently allow remote code execution. This type of vulnerability is particularly concerning in enterprise environments where users may unknowingly visit compromised websites or receive malicious email attachments that contain embedded web content. The vulnerability is categorized as a remote code execution flaw and maps to the attack technique T1203 in the ATT&CK framework, which covers exploitation for execution through various methods including web-based attacks. The memory corruption aspect of this vulnerability makes it especially dangerous because it can lead to unpredictable behavior in the browser, potentially allowing attackers to bypass security mechanisms and escalate privileges. The lack of specific vector information in the original CVE description indicates that this vulnerability was likely identified through comprehensive security testing and analysis rather than a single specific attack scenario, which is typical for memory corruption issues that can be triggered through multiple pathways. This vulnerability demonstrates the critical importance of proper error handling and memory management in browser implementations, as even unhandled error conditions can create significant security risks. The vulnerability affects a wide range of Internet Explorer versions, indicating that it was likely a long-standing issue in the browser's memory management system that was not properly addressed through earlier security updates, making it a prime target for exploitation in various attack scenarios.
The vulnerability represents a classic example of how improper error handling can lead to severe security consequences in software applications. The memory corruption issue occurs when the browser encounters an error condition that is not gracefully handled, causing the memory management system to become unstable and potentially allowing arbitrary code execution. This pattern of vulnerability is particularly prevalent in complex software systems where numerous error conditions must be managed, and the failure to account for all possible error scenarios can create security holes. The affected versions of Internet Explorer span a significant period of browser evolution, indicating that this fundamental flaw in error handling was present across multiple iterations of the software, suggesting that the root cause was in the underlying architecture rather than a specific implementation detail. Security researchers and attackers alike would have recognized this as a high-value target due to the potential for remote code execution and the widespread use of Internet Explorer at the time of the vulnerability disclosure. The vulnerability's classification as a memory corruption issue aligns with the broader category of heap-based buffer overflows and memory safety problems that have been extensively documented in cybersecurity literature. The unspecified nature of the attack vectors also suggests that the vulnerability was likely discovered through advanced exploitation techniques or systematic testing rather than through a single obvious attack path, which is common with memory corruption vulnerabilities that can manifest in various ways depending on the specific error conditions encountered.
Mitigation strategies for this vulnerability would have required immediate patching of the affected Internet Explorer versions, as there were no practical workarounds that could address the underlying memory management issue. Organizations would have needed to implement comprehensive patch management procedures to ensure all affected systems were updated promptly, as the vulnerability could be exploited through web-based attacks without any user interaction required beyond visiting a malicious website. The vulnerability highlighted the importance of maintaining up-to-date security patches and demonstrated how even seemingly minor error handling issues could lead to critical security compromises. Browser vendors and security researchers would have needed to develop detection mechanisms to identify when this vulnerability was being actively exploited in the wild, as the unspecified nature of the vectors made it difficult to create precise signature-based detection rules. The vulnerability also underscored the need for more robust memory safety mechanisms in browser implementations, leading to increased adoption of techniques such as address space layout randomization and stack canaries. Organizations would have needed to implement additional security controls such as web application firewalls and browser hardening measures to reduce the attack surface and prevent exploitation attempts. The incident also demonstrated the importance of vulnerability disclosure processes and the need for vendors to provide clear guidance on how to protect systems against known vulnerabilities. Security professionals would have needed to monitor for exploitation attempts and develop incident response procedures specifically tailored to address memory corruption vulnerabilities in browser environments. This vulnerability ultimately contributed to the broader understanding of browser security and the importance of memory safety in preventing remote code execution attacks.