CVE-2020-0653 in Office
Summary
by MITRE
A remote code execution vulnerability exists in Microsoft Excel software when the software fails to properly handle objects in memory, aka 'Microsoft Excel Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2020-0650, CVE-2020-0651.
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Analysis
by VulDB Data Team • 03/21/2024
The vulnerability identified as CVE-2020-0653 represents a critical remote code execution flaw within Microsoft Excel software that stems from improper handling of objects in memory. This vulnerability specifically affects Microsoft Excel applications across multiple versions and operating systems, creating a significant attack surface for malicious actors who seek to compromise systems through spreadsheet files. The flaw exists in the way Excel processes certain file formats and memory objects, allowing attackers to craft malicious spreadsheets that can execute arbitrary code when opened by unsuspecting users. This type of vulnerability is particularly dangerous because it leverages user interaction with seemingly benign office documents, making it a prime target for phishing campaigns and social engineering attacks. The vulnerability's classification as a remote code execution issue means that attackers can potentially gain full control over affected systems without requiring local access or credentials.
The technical root cause of CVE-2020-0653 lies in the improper validation and handling of memory objects during the parsing of Excel file formats. When Excel encounters specially crafted spreadsheet files containing malformed objects or structures, the application fails to properly sanitize these inputs before processing them in memory. This memory handling error creates opportunities for attackers to manipulate the execution flow of the application through buffer overflows, heap corruption, or other memory-related vulnerabilities. The vulnerability typically manifests when Excel attempts to render or process complex spreadsheet elements such as charts, pivot tables, or embedded objects that contain maliciously constructed data. According to CWE classification, this vulnerability maps to CWE-125: Out-of-bounds Read, which describes the condition where a program reads data past the end, or before the beginning, of the intended buffer. The flaw also relates to CWE-787: Out-of-bounds Write, which occurs when a program writes to memory beyond the boundaries of a buffer. These memory corruption issues provide attackers with the necessary conditions to execute arbitrary code remotely.
From an operational impact perspective, CVE-2020-0653 poses severe risks to enterprise environments where Excel is widely used for business operations, data analysis, and collaborative work. Organizations with extensive spreadsheet usage patterns are particularly vulnerable since users frequently open files from external sources, email attachments, or shared network drives. The remote execution capability means that attackers can compromise systems from anywhere in the world, making this vulnerability highly attractive for nation-state actors and organized cybercriminal groups. Successful exploitation can result in complete system compromise, data exfiltration, lateral movement within networks, and establishment of persistent backdoors. The vulnerability's impact extends beyond individual user systems to entire organizational infrastructures, as compromised Excel applications can serve as initial access points for broader attacks. According to ATT&CK framework, this vulnerability maps to T1203: Exploitation for Client Execution, where adversaries leverage vulnerabilities in applications to execute code on target systems. The attack chain typically involves initial compromise through malicious Excel files, followed by privilege escalation and persistence mechanisms.
Mitigation strategies for CVE-2020-0653 should encompass both immediate patch management and defensive operational measures. Microsoft released security updates addressing this vulnerability through regular security patches, and organizations must prioritize deployment of these updates across all affected Excel installations. Network segmentation and email filtering should be implemented to reduce the likelihood of malicious Excel files reaching end users, particularly through email attachments and web downloads. Application whitelisting and macro security settings should be configured to restrict execution of potentially malicious code within Excel environments. Regular security awareness training for users can help prevent social engineering attacks that exploit this vulnerability through phishing campaigns. Organizations should also implement monitoring solutions to detect unusual Excel process behavior or memory access patterns that might indicate exploitation attempts. The vulnerability demonstrates the importance of maintaining up-to-date security patches and implementing layered defense strategies to protect against sophisticated remote code execution vulnerabilities in widely used software applications.