CVE-2018-8349 in Windows
Summary
by MITRE
A remote code execution vulnerability exists in "Microsoft COM for Windows" when it fails to properly handle serialized objects, aka "Microsoft COM for Windows Remote Code Execution Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers.
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Analysis
by VulDB Data Team • 07/15/2024
The vulnerability identified as CVE-2018-8349 represents a critical remote code execution flaw within Microsoft's Component Object Model (COM) implementation for Windows operating systems. This weakness stems from inadequate handling of serialized objects during the COM marshaling process, creating a pathway for malicious actors to execute arbitrary code on targeted systems. The vulnerability affects a broad range of Windows versions including legacy systems like Windows Server 2008 and Windows Server 2008 R2, as well as modern deployments such as Windows 10 and Windows Server 2016, making it particularly concerning for enterprise environments where patch management may be inconsistent across different system generations.
The technical root cause of this vulnerability lies in the improper validation and processing of serialized data structures within the COM framework. When Windows applications or services attempt to deserialize objects received through COM interfaces, the system fails to adequately verify the integrity and safety of the serialized payload. This flaw enables attackers to craft malicious serialized objects that, when processed by the vulnerable COM components, trigger unintended code execution. The vulnerability specifically manifests when COM objects are created or manipulated through the Windows operating system's COM infrastructure, particularly affecting the marshaling and unmarshaling operations that facilitate inter-process communication. According to CWE-129, this vulnerability maps to improper validation of input data during deserialization processes, while the ATT&CK framework categorizes this as a remote code execution technique that leverages system-level components for privilege escalation.
The operational impact of CVE-2018-8349 extends beyond simple exploitation as it provides attackers with a powerful vector for establishing persistent access to compromised systems. Once successfully exploited, attackers can execute malicious code with the privileges of the compromised process, typically SYSTEM level access on Windows systems. This vulnerability is particularly dangerous because it can be triggered through various attack vectors including email attachments, web-based content, or malicious downloads that cause Windows applications to process vulnerable COM objects. The vulnerability's presence in multiple Windows versions means that organizations with mixed environments face increased risk, as attackers can target the least secure system in their network. Network-based attacks are possible since COM objects can be transmitted over various network protocols and processed by Windows systems without user interaction, making this vulnerability particularly attractive to automated exploit campaigns.
Mitigation strategies for CVE-2018-8349 should prioritize immediate patch deployment through Microsoft's regular security updates, as the vendor has released specific patches addressing this vulnerability. Organizations should implement network segmentation and firewall rules to restrict unnecessary COM communication between systems, particularly limiting outbound connections that could facilitate exploitation. The principle of least privilege should be enforced by restricting user permissions and application access rights to minimize potential impact if exploitation occurs. Security monitoring should focus on detecting unusual COM object creation patterns, unexpected process execution, and network traffic involving potentially vulnerable COM interfaces. System hardening measures including disabling unnecessary COM components, implementing application whitelisting, and enabling Windows Defender Application Control can provide additional defense layers. According to Microsoft's security guidance, organizations should also consider implementing exploit prevention technologies such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) to make successful exploitation more difficult. Regular vulnerability assessments and penetration testing should be conducted to identify systems that may still be vulnerable due to incomplete patching or legacy applications that continue to use vulnerable COM interfaces.