CVE-2021-31955 is classified as a Windows Kernel Information Disclosure Vulnerability with a CVSS score of 5.5, indicating a medium severity level. This vulnerability allows attackers to read sensitive information from the kernel memory, which could lead to further exploitation of the system. The risk to organizations includes unauthorized access to sensitive information, which can compromise the integrity and confidentiality of the system.
As of now, this vulnerability has been confirmed to have known exploits, which emphasizes the urgency for defenders to apply necessary patches. Organizations should prioritize patching immediately to mitigate risks associated with this vulnerability.
The vulnerability was made public on June 8, 2021, and affects multiple versions of Windows, including Windows 10 and Windows Server. Its exploitation could lead to significant breaches of sensitive data.
Given its classification and the potential impact, organizations must take immediate action to protect their systems from potential exploitation.
Vulnerability Details
CVE-2021-31955 is described as a Windows Kernel Information Disclosure Vulnerability. The CVSS score is 5.5, indicating medium severity, primarily due to its potential impact on confidentiality. The affected products include various Windows 10 versions and Windows Server editions, specifically those prior to specific patch versions. The vulnerability was published on June 8, 2021. No specific CWE classification is provided; however, it has associations with CWE-497.
Technical Analysis
The root cause of CVE-2021-31955 lies within the Windows Kernel, which fails to properly handle certain requests leading to potential information disclosure. The attack vector is local, meaning that an attacker would need physical or remote access to the machine. The attack complexity is assessed as low, requiring low privileges and no user interaction, making this vulnerability particularly dangerous. While it impacts confidentiality significantly, it does not affect integrity or availability.
Risk & Impact Analysis
The risk to organizations includes unauthorized access to sensitive information, which may lead to further exploitation or compromise of systems. The blast radius could extend to all users of the affected Windows versions. Given the low complexity of exploitation and the availability of known exploits, organizations should address this vulnerability in their priority patch cycle. The urgency for remediation is critical due to its inclusion in the Known Exploited Vulnerabilities catalog.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The vulnerability affects all versions of Microsoft Windows prior to the following patched versions: Windows 10 1809 (before 10.0.17763.1999), Windows 10 1909 (before 10.0.18363.1621), Windows 10 2004 (before 10.0.19041.1052), Windows 10 20H2 (before 10.0.19042.1052), Windows 10 21H1 (before 10.0.19043.1052), Windows Server 2004 (before 10.0.19041.1052), Windows Server 2019 (before 10.0.17763.1999), and Windows Server 20H2 (before 10.0.19042.1052).
Mitigation & Remediation
Organizations should apply updates per vendor instructions to mitigate this vulnerability. For further guidance on security testing, organizations can refer to penetration testing services that can help identify similar vulnerabilities in their systems.
Detection Guidance
To detect potential exploitation of CVE-2021-31955, organizations should monitor system logs for any unusual access to kernel memory segments. Behavioral anomalies indicating unauthorized attempts to access sensitive information could also be indicative of exploitation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-31955 reflects ongoing challenges organizations face in securing kernel-level operations. This vulnerability represents a pattern of information disclosure weaknesses in widely used operating systems. Security teams should prioritize effective patch management practices and consider adopting a vulnerability management program to systematically address such vulnerabilities. Organizations should also review their penetration testing methodology to ensure all potential weaknesses are identified and mitigated.
Additionally, organizations can gain insights from monitoring trends in security testing best practices to bolster their defenses against similar vulnerabilities in future.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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