CVE-2019-0541 is classified as a remote code execution vulnerability that exists in the way the MSHTML engine improperly validates input. This vulnerability allows attackers to execute arbitrary code on the affected systems. It specifically impacts Microsoft Office products, including Microsoft Office Word Viewer, Internet Explorer 9, Internet Explorer 10, Internet Explorer 11, Microsoft Excel Viewer, and Office 365 ProPlus.
With a CVSS score of 8.8, this vulnerability is considered high severity. The attack vector is network-based, requiring low attack complexity, no privileges, and user interaction to exploit. The potential risk to organizations includes high confidentiality, integrity, and availability impacts, making this a critical issue to address.
The vulnerability was published on January 8, 2019, and was added to the Known Exploited Vulnerabilities (KEV) catalog on November 3, 2021. Organizations using affected Microsoft products should treat this vulnerability with urgency and prioritize patching to mitigate the risks associated with potential exploitation.
Organizations should prioritize patching immediately. The urgency of addressing this vulnerability is underscored by its inclusion in the KEV catalog, indicating active exploitation in the wild.
Vulnerability Details
CVE-2019-0541 is a remote code execution vulnerability caused by improper input validation in the MSHTML engine. The vulnerability affects several Microsoft products, including Microsoft Office and Internet Explorer.
The vulnerability has a CVSS score of 8.8, which categorizes it as high severity. The attack vector is network-based, the attack complexity is low, and it requires no privileges but does require user interaction. The impacts on confidentiality, integrity, and availability are all high.
Technical Analysis
The root cause of CVE-2019-0541 lies in the MSHTML engine's failure to properly validate input. Attackers may leverage this vulnerability through crafted web content or documents that exploit the improper validation, allowing for remote code execution.
This vulnerability requires user interaction, meaning that an unsuspecting user must open a malicious document or visit a compromised webpage. The attack complexity is low, which means that even less sophisticated attackers could potentially exploit it.
Risk & Impact Analysis
Risk to organizations includes significant potential for data breaches, unauthorized access to sensitive information, and operational disruption. The blast radius can extend to any user who interacts with the affected MSHTML engine, potentially impacting entire organizations.
Given the high CVSS score and the active exploitation status, organizations must assess their exposure and prioritize remediation efforts. Organizations should address this vulnerability in their priority patch cycle to minimize risk.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The following versions are affected by CVE-2019-0541: Internet Explorer 9, Internet Explorer 10, Internet Explorer 11, Microsoft Office 2010 (SP2), Office 2013 (SP1), Office 2016, Office 2019, Office 365 ProPlus, and Microsoft Excel Viewer 2007 (SP3). Organizations should confirm they are running patched versions to mitigate this vulnerability.
Mitigation & Remediation
Organizations should apply the latest security updates provided by Microsoft. Users should check the Microsoft Security Response Center for more information on patches. If immediate patching is not possible, consider implementing network controls to limit exposure to untrusted sources and user training to recognize potential phishing attempts.
For further information on how to secure your systems, organizations can refer to the penetration testing services offered by AppSecure.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for abnormal behavior associated with MSHTML engine usage. Indicators may include unexpected application crashes, unauthorized access attempts, or unusual network traffic patterns.
AppSecure Threat Intelligence Insight
CVE-2019-0541 highlights the ongoing risks associated with improper input validation in widely used software components. Security teams should prioritize the identification and remediation of similar vulnerabilities to prevent future incidents.
Organizations can enhance their security posture by implementing comprehensive security practices, including regular vulnerability assessments and vulnerability management programs. They should also consider regular penetration testing to validate the effectiveness of their security measures.
By staying proactive and informed about vulnerabilities such as CVE-2019-0541, organizations can significantly reduce their exposure to 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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