A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SProcXFixesCreatePointerBarrier function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. With a CVSS score of 7.8, this vulnerability is classified as high severity, indicating the potential for significant impact on affected systems.
Risk to organizations includes unauthorized access to sensitive data, system disruptions, and potential exploitation of the vulnerability by malicious actors. As such, organizations utilizing affected versions of xorg-x11-server must act swiftly to address this vulnerability.
The out-of-bounds access issue presents a vector for attackers to exploit, resulting in the potential compromise of system integrity and availability. Given these risks, organizations should prioritize patching immediately.
No public exploit has been confirmed, and the vulnerability is not currently listed as actively exploited in known exploitation databases. However, the nature of the vulnerability necessitates immediate attention.
Vulnerability Details
The vulnerability, identified as CVE-2021-4009, allows for out-of-bounds access in the SProcXFixesCreatePointerBarrier function within the xorg-x11-server. The affected versions include those before 21.1.2 and 1.20.14. The severity of this vulnerability is underscored by its CVSS 3.1 score of 7.8, indicating a high risk level due to its potential impact on confidentiality, integrity, and availability.
This vulnerability is classified under CWE-119, which pertains to improper restriction of operations within the bounds of a memory buffer. The disclosed information was published on 2021-12-17, with the last modification recorded on 2024-11-21.
Technical Analysis
The root cause of the vulnerability lies in the incorrect handling of memory access in the SProcXFixesCreatePointerBarrier function, which can lead to out-of-bounds access. The attack vector is local, requiring low complexity, and only low privileges are needed to exploit it. Importantly, user interaction is not required for the attack to succeed.
If exploited, the impacts on confidentiality, integrity, and availability are all rated as high, demonstrating the severe implications of this vulnerability. The potential for system disruption and unauthorized access to sensitive data underscores the need for prompt remediation.
Risk & Impact Analysis
Real-world deployment risk is significant due to the local nature of the vulnerability, which enables attackers with local access to exploit it easily. Organizations could face extensive damage including data breaches, system downtime, and loss of data integrity.
The urgency for organizations to address this vulnerability is high, as the potential blast radius includes any system where the affected versions of xorg-x11-server are deployed. Given the high severity CVSS score, immediate remediation efforts are recommended.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions include xorg-x11-server versions before 21.1.2 and before 1.20.14. Additionally, various releases of Debian and Fedora are impacted, including Debian Linux versions 9.0, 10.0, and 11.0, as well as Fedora versions 34 and 35.
Mitigation & Remediation
Organizations should prioritize upgrading to patched versions of xorg-x11-server to mitigate this vulnerability. For Debian users, upgrading to version 21.1.2 or later is recommended. Fedora users should upgrade to 1.20.14 or later. In cases where immediate patching is not possible, organizations should implement configuration hardening and network controls to limit access to vulnerable systems.
For further assistance, organizations may consider penetration testing services to identify and remediate similar vulnerabilities.
Detection Guidance
Organizations should monitor logs for any unusual access patterns or attempts to exploit this vulnerability. Behavioral anomalies indicating out-of-bounds access attempts should be flagged. Additionally, monitoring for changes in system configuration can help identify attempts to exploit this flaw.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its potential to disrupt operations and compromise sensitive data. It highlights the importance of proactive vulnerability management and regular patching procedures.
Security teams should take note of the trends represented by such vulnerabilities, focusing on the importance of securing local access points and ensuring robust monitoring systems are in place.
For additional insights, organizations may refer to our article on vulnerability management programs and consider implementing continuous security practices to mitigate future risks.
Understanding the risk landscape is crucial for effective defense. Organizations must remain vigilant and adaptable to emerging threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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