CVE-2018-1026 in Office
Summary
by MITRE
A remote code execution vulnerability exists in Microsoft Office software when the software fails to properly handle objects in memory, aka "Microsoft Office Remote Code Execution Vulnerability." This affects Microsoft Office. This CVE ID is unique from CVE-2018-1030.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 02/09/2021
The vulnerability identified as CVE-2018-1026 represents a critical remote code execution flaw within Microsoft Office software that stems from improper handling of objects in memory. This weakness allows attackers to execute arbitrary code on affected systems without requiring authentication, making it particularly dangerous in enterprise environments where Office applications are widely deployed. The vulnerability specifically impacts Microsoft Office applications including Word, Excel, and PowerPoint, which are commonly used across organizations for document creation and data analysis. Security researchers have classified this issue as a remote code execution vulnerability, indicating that an attacker can potentially compromise a system from a remote location through maliciously crafted Office documents.
The technical root cause of CVE-2018-1026 lies in the improper memory management handling within Microsoft Office applications. When these applications process specially crafted objects within Office documents, they fail to properly validate or sanitize memory operations, leading to memory corruption that can be exploited by malicious actors. This type of vulnerability falls under the Common Weakness Enumeration category CWE-125, which describes out-of-bounds read conditions where programs access memory locations beyond their allocated boundaries. The flaw occurs during the parsing of Office document formats, particularly affecting how the applications handle complex object structures and embedded content. Attackers can leverage this vulnerability by crafting malicious Office documents that trigger the memory corruption when opened by an unsuspecting user, potentially allowing them to execute code with the privileges of the logged-in user.
The operational impact of this vulnerability extends far beyond individual system compromises, as it can enable attackers to establish persistent access within organizational networks. Once successfully exploited, the vulnerability allows threat actors to download and execute additional malware, establish backdoors, or escalate privileges to gain administrative access to systems. This capability makes CVE-2018-1026 particularly attractive to advanced persistent threat groups and cybercriminal organizations targeting enterprise environments. The vulnerability's remote execution nature means that attackers can deliver malicious payloads through email attachments, web downloads, or compromised websites without requiring physical access to target systems. Organizations running affected versions of Microsoft Office are at significant risk of data breaches, system compromise, and potential lateral movement within their networks, as the exploit can be delivered through various attack vectors including phishing campaigns and malicious web content.
Mitigation strategies for CVE-2018-1026 should encompass multiple layers of defense to protect against exploitation attempts. Microsoft has released security updates and patches to address this vulnerability, which organizations should deploy immediately across all affected systems. System administrators should implement strict email filtering and web content filtering measures to prevent users from accessing potentially malicious Office documents. The principle of least privilege should be enforced, ensuring that Office applications run with minimal required permissions and that users have limited administrative privileges. Network segmentation and monitoring solutions should be deployed to detect anomalous behavior that might indicate exploitation attempts. Security teams should also consider implementing application whitelisting policies that restrict execution of Office applications to trusted sources only. Additionally, regular security awareness training for users can help reduce the risk of successful social engineering attacks that might deliver malicious documents. Organizations should monitor their systems for indicators of compromise and maintain up-to-date threat intelligence to identify potential exploitation attempts targeting this vulnerability. The ATT&CK framework categorizes this vulnerability under the T1203 technique for Exploitation for Client Execution, highlighting the need for comprehensive endpoint protection and network monitoring solutions to detect and prevent exploitation attempts.