CVE-2020-1147 is a high-severity remote code execution vulnerability that exists in Microsoft .NET Framework, Microsoft SharePoint, and Visual Studio. This vulnerability arises when the software fails to properly check the source markup of XML file input. If successfully exploited, an attacker could execute arbitrary code in the context of the affected process.
With a CVSS score of 7.8, this vulnerability represents a significant risk to organizations leveraging these technologies. The potential for unauthorized code execution can lead to severe consequences, including data breaches and loss of sensitive information. Organizations should prioritize patching immediately to mitigate this risk.
The vulnerability was published on July 14, 2020, and has been analyzed thoroughly by Microsoft. It is classified as a remote code execution vulnerability, which significantly increases the urgency for remediation given its implications on system security.
As of now, this vulnerability is included in the Known Exploited Vulnerabilities (KEV) catalog, indicating that it has been actively targeted or exploited in the wild. Organizations utilizing affected Microsoft products should take immediate action to apply available patches and mitigate potential exploitation.
Vulnerability Details
The official description of CVE-2020-1147 states, "A remote code execution vulnerability exists in .NET Framework, Microsoft SharePoint, and Visual Studio when the software fails to check the source markup of XML file input, aka '.NET Framework, SharePoint Server, and Visual Studio Remote Code Execution Vulnerability'."
This vulnerability is classified under the Common Weakness Enumeration (CWE) category, although specific CWE IDs are not provided. The attack vector is categorized as local, requiring low complexity and no privileges to exploit, although user interaction is required.
The CVSS 3.1 vector string for this vulnerability is 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H', reflecting high impacts on confidentiality, integrity, and availability.
Affected products include various versions of .NET Core, .NET Framework, SharePoint Enterprise Server, SharePoint Server, and Visual Studio 2017 and 2019.
Technical Analysis
The root cause of this vulnerability lies in the failure of the software to validate the source markup of XML file inputs adequately. Attackers may leverage this flaw to bypass security checks and execute arbitrary code.
The attack vector for this vulnerability is local, requiring the attacker to have access to a system where the vulnerable software is installed. Given that user interaction is required, exploitation is somewhat limited but still poses a significant risk, especially in environments where users may inadvertently trigger the exploit.
The complexity of the attack is low, and no specific privileges are required, which increases the likelihood of successful exploitation if user interaction occurs. Should an attack be successful, the impacts on confidentiality, integrity, and availability are significant, as noted by the CVSS scoring.
Risk & Impact Analysis
The real-world risk associated with CVE-2020-1147 is substantial. Organizations utilizing affected versions of Microsoft .NET Framework, SharePoint, and Visual Studio face the potential for severe compromises if this vulnerability is exploited. The blast radius could be extensive, impacting multiple systems and users.
Given the importance of these technologies in various business processes, the urgency assessment based on the CVSS score of 7.8 indicates that organizations should prioritize patching immediately.
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
CVE-2020-1147 affects multiple versions of Microsoft products, including .NET Core 2.1 and 3.1, .NET Framework (various versions), SharePoint Enterprise Server 2013, 2016, and SharePoint Server 2010, 2019, and Visual Studio 2017 and 2019.
Mitigation & Remediation
Organizations should apply updates as per vendor instructions to mitigate the risks associated with CVE-2020-1147. If patches are not available, consider implementing additional security measures such as input validation and user access controls.
For more information on effective remediation strategies, organizations can consult our penetration testing services.
Detection Guidance
Organizations should monitor for unusual activity related to .NET Framework, SharePoint, and Visual Studio. Indicators of compromise (IoCs) include unexpected application crashes, unauthorized access attempts, and unusual XML file processing activities.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2020-1147 highlights the continuing challenges organizations face in securing complex software systems. It represents a trend where vulnerabilities arise from inadequate input validation—a common oversight in software development.
Security teams should learn from this incident, emphasizing the importance of secure coding practices and thorough testing. For further insights on improving application security, organizations can refer to our web application penetration testing resources.
Additionally, our comprehensive guide on penetration testing methodology can provide further strategies for enhancing your security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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