CVE-2018-8464 in Edge
Summary
by MITRE
An remote code execution vulnerability exists when Microsoft Edge PDF Reader improperly handles objects in memory, aka "Microsoft Edge PDF Remote Code Execution Vulnerability." This affects Microsoft Edge.
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Analysis
by VulDB Data Team • 05/08/2023
The vulnerability identified as CVE-2018-8464 represents a critical remote code execution flaw within Microsoft Edge's PDF Reader component, classified under CWE-125 as an out-of-bounds read error. This issue arises from improper memory handling when Edge processes PDF documents, specifically when encountering malformed or maliciously constructed PDF objects that trigger unexpected behavior in the underlying rendering engine. The vulnerability is particularly dangerous because it allows attackers to execute arbitrary code on affected systems without requiring user interaction beyond visiting a malicious website or opening a compromised PDF file, making it a prime target for drive-by download attacks and social engineering campaigns.
The technical exploitation of this vulnerability occurs through memory corruption techniques that leverage the PDF rendering engine's insufficient input validation mechanisms. When Microsoft Edge encounters specially crafted PDF content containing malformed objects, the parser fails to properly validate memory boundaries, leading to buffer overflows or out-of-bounds memory access conditions. This flaw falls under the ATT&CK technique T1203 - Exploitation for Client Execution, where adversaries leverage browser vulnerabilities to execute malicious code remotely. The vulnerability affects Microsoft Edge versions including EdgeHTML 16.16299 and earlier versions, making it particularly relevant during the Windows 10 Anniversary Update period when many organizations were still running affected browser versions.
The operational impact of CVE-2018-8464 extends beyond simple code execution, as successful exploitation can lead to full system compromise and persistent access for attackers. Once executed, malicious code can establish backdoors, escalate privileges, or download additional malware payloads, potentially resulting in data breaches, credential theft, or lateral movement within network environments. Organizations running unpatched Edge browsers face significant risk exposure, particularly in environments where users frequently access untrusted websites or download PDF documents from unknown sources. The vulnerability's remote nature means that attackers can exploit it from anywhere on the internet, making it a preferred target for automated exploit campaigns and zero-day attack vectors.
Mitigation strategies for CVE-2018-8464 should prioritize immediate patch deployment through Microsoft's regular security updates, specifically addressing the EdgeHTML component vulnerabilities. Organizations should implement browser hardening measures including disabling PDF viewing in Edge or configuring the browser to open PDFs in a separate process with restricted privileges. Network segmentation and web filtering solutions can provide additional defense-in-depth layers by blocking access to known malicious domains and implementing content inspection for PDF files. Security teams should also monitor for exploitation attempts through network intrusion detection systems and endpoint detection and response solutions that can identify anomalous behavior patterns associated with memory corruption exploits. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date browser security patches and implementing comprehensive endpoint protection strategies to defend against sophisticated remote code execution attacks targeting web browsers.