CVE-2017-0226 in Internet Explorer
Summary
by MITRE
A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory, aka "Internet Explorer Memory Corruption Vulnerability." This CVE ID is unique from CVE-2017-0222.
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Analysis
by VulDB Data Team • 12/22/2020
The vulnerability identified as CVE-2017-0226 represents a critical remote code execution flaw within Microsoft Internet Explorer that stems from improper memory handling during object access operations. This issue affects multiple versions of Internet Explorer and constitutes a memory corruption vulnerability that can be exploited by attackers to execute arbitrary code on affected systems. The flaw specifically manifests when the browser's rendering engine fails to properly validate memory references during object manipulation, creating opportunities for malicious actors to inject and execute unauthorized code. The vulnerability is particularly concerning because it operates at the core memory management level of the browser, making it difficult to detect and prevent through conventional security measures.
The technical nature of this vulnerability aligns with CWE-125, which describes out-of-bounds read conditions where programs access memory locations beyond their intended boundaries. In the context of Internet Explorer, this manifests when the browser's JavaScript engine or rendering components attempt to access memory objects that have already been freed or are otherwise inaccessible. Attackers can exploit this by crafting malicious web pages that trigger specific memory access patterns, causing the browser to execute unintended code sequences. The vulnerability operates through a sophisticated exploitation chain that typically involves memory corruption techniques such as heap spraying or use-after-free conditions, where previously deallocated memory is accessed after being reused for different purposes.
From an operational perspective, this vulnerability presents significant risk to organizations relying on Internet Explorer for web browsing activities, as it enables attackers to gain complete system control without requiring user interaction beyond visiting a malicious website. The remote code execution capability means that attackers can deploy malware, establish persistence mechanisms, or conduct further reconnaissance activities once initial access is achieved. The impact extends beyond individual user systems to potentially compromise entire enterprise networks, especially when users access untrusted websites or receive malicious emails containing compromised web content. Security teams must consider the broad attack surface this vulnerability creates, as it can be leveraged for advanced persistent threats or mass deployment of malware across multiple systems simultaneously.
Mitigation strategies for CVE-2017-0226 should include immediate deployment of Microsoft security patches, which address the underlying memory management issues in Internet Explorer's rendering engine. Organizations should also implement network-based protections such as web application firewalls and content filtering solutions that can detect and block malicious web content targeting this specific vulnerability. Browser hardening techniques including disabling unnecessary JavaScript features and implementing strict memory protection mechanisms can reduce exploitation success rates. Additionally, security monitoring should focus on detecting unusual memory access patterns or unexpected code execution within browser processes. The ATT&CK framework categorizes this vulnerability under technique T1203, which involves exploiting memory corruption vulnerabilities for privilege escalation and code execution, emphasizing the need for comprehensive endpoint protection and regular vulnerability assessment programs to prevent successful exploitation attempts.