CVE-2021-31174 is identified as a medium-severity information disclosure vulnerability affecting Microsoft Excel and other related Microsoft Office products. This vulnerability allows unauthorized access to sensitive information, which can significantly impact confidentiality. The CVSS score for this vulnerability is 5.5, indicating a moderate level of risk that organizations should not ignore.
The vulnerability is classified under CWE-125, which pertains to out-of-bounds read, allowing attackers to potentially gain access to sensitive data. Given its nature, the vulnerability poses a risk to organizations that utilize affected Microsoft products, especially in environments where sensitive data is handled.
Organizations should prioritize patching immediately to address this vulnerability. It is crucial to stay updated with the latest security patches from Microsoft to mitigate the risks associated with this vulnerability.
The vulnerability was published on May 11, 2021, and the urgency for remediation remains significant. As of now, there is no known public exploit, but the potential for information disclosure should be taken seriously.
Vulnerability Details
Microsoft Excel Information Disclosure Vulnerability is the official description of CVE-2021-31174. The vulnerability allows for high confidentiality impact, with low attack complexity and local attack vector. The attack does not require user interaction, which highlights the severity of the risk.
The CVSS score of 5.5 is classified as medium severity. This score reflects the potential impact on confidentiality while not affecting integrity or availability. The vulnerability affects various versions of Microsoft Office, including Excel 2013, 2016, 2019, and 365 Apps, among others.
Technical Analysis
The root cause of CVE-2021-31174 lies in improper handling of user data within Microsoft Excel, leading to potential out-of-bounds read scenarios. The attack vector is local, meaning it requires access to the vulnerable system. The attack complexity is low, and the privileges required are also low, allowing for easier exploitation.
Given the nature of the vulnerability, a potential attacker could gain access to sensitive information without needing additional privileges or user interaction. The confidentiality impact is classified as high, while integrity and availability impacts are none.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized access to sensitive information, leading to data breaches and compliance issues. The blast radius can be significant, especially in environments handling personal, financial, or proprietary data.
The urgency for remediation is assessed as medium due to the exploitability of the vulnerability and the potential impacts on confidentiality. Organizations are advised to review their Microsoft product installations and apply the necessary patches to mitigate this risk.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
CVE-2021-31174 affects various Microsoft Office products, including Excel 2013 (SP1), Excel 2016, Office 2013 (SP1), Office 2016, Office 2019, as well as Office Online Server and Office Web Apps Server. Organizations are advised to ensure their installations are updated with the latest patches.
Mitigation & Remediation
To remediate CVE-2021-31174, organizations should apply the latest patches provided by Microsoft. It is essential to monitor the Microsoft Security Response Center for updates regarding this vulnerability. If immediate patching is not feasible, organizations should implement strict access controls and monitoring to mitigate potential exploitation.
For further guidance on security practices, organizations may consider engaging in penetration testing to identify potential vulnerabilities in their systems.
Detection Guidance
Organizations should monitor logs for indicators of unauthorized access attempts and unusual data access patterns. Behavioral anomalies, especially related to sensitive data usage, should be flagged and investigated promptly.
AppSecure Threat Intelligence Insight
CVE-2021-31174 represents a significant vector for potential data breaches in environments using Microsoft Excel. Continuous monitoring and proactive vulnerability management are essential to minimize the risk associated with this and similar vulnerabilities.
Security teams should leverage insights from established vulnerability management practices, including frequent security assessments and regular updates to software components.
Organizations should also consider adopting a comprehensive approach to security by integrating vulnerability management programs that can help in identifying and mitigating risks before they can be exploited.
In conclusion, staying informed about vulnerabilities such as CVE-2021-31174 is critical for maintaining a secure environment. Organizations are urged to implement the recommended mitigations and maintain a proactive security posture to defend against potential threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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