A use-after-free flaw was found in xorg-x11-server-Xvfb. This issue occurs in Xvfb with a very specific and legacy configuration (a multi-screen setup with multiple protocol screens, also known as Zaphod mode). If the pointer is warped from a screen 1 to a screen 0, a use-after-free issue may be triggered during shutdown or reset of the Xvfb server, allowing for possible escalation of privileges or denial of service.
The severity of this vulnerability is classified as high due to its CVSS score of 7.0. This rating indicates that while the attack complexity is high, the potential impact on confidentiality, integrity, and availability is significant, making it a critical concern for organizations using affected systems.
Risk to organizations includes potential unauthorized access and service disruptions, which could affect operational stability. Organizations should prioritize patching immediately to mitigate these risks.
Currently, there are no known exploits or public proof of concept (PoC) available for this vulnerability. However, the unique conditions under which it can be exploited necessitate swift corrective actions.
Vulnerability Details
The vulnerability identified as CVE-2023-5574 is a use-after-free flaw in xorg-x11-server-Xvfb, specifically affecting systems configured in a multi-screen setup known as Zaphod mode. The vulnerability allows for potential privilege escalation or denial of service.
The CVSS score for this vulnerability is 7.0, indicating a high severity level. It is crucial for affected organizations to understand the potential impacts, especially in terms of confidentiality, integrity, and availability.
This vulnerability affects the following products: Red Hat Enterprise Linux 7.0 and X.Org Server. The vulnerability was published on October 25, 2023, and is classified under CWE-416.
Technical Analysis
The root cause of the vulnerability lies in how the Xvfb server handles memory management, specifically during shutdown or reset operations in specific configurations. The attack vector is local, meaning an attacker must have access to the local system where Xvfb is running.
The attack complexity is high, as it requires a specific configuration and a sequence of actions to exploit. Privileges required for exploitation are low, allowing for potential privilege escalation if conditions are met. User interaction is not necessary for this vulnerability to be exploited.
The impacts of this vulnerability are severe, as it may lead to unauthorized access (high confidentiality impact), alteration of system files (high integrity impact), and service interruptions (high availability impact).
Risk & Impact Analysis
Organizations utilizing Red Hat Enterprise Linux 7.0 and X.Org Server are at significant risk due to the potential for privilege escalation or denial of service. The blast radius is considerable, as many systems within an organization may utilize the Xvfb component in multi-screen configurations.
Given the high CVSS score of 7.0, organizations should address this vulnerability in their priority patch cycle to prevent exploitation.
The urgent need for remediation is underscored by the high potential impact on operational integrity and the lack of current public exploits, which may change.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
This vulnerability affects the following versions: Red Hat Enterprise Linux 7.0 and X.Org Server. Organizations using these products should evaluate their configurations and apply the necessary patches.
Mitigation & Remediation
Organizations should check for patches provided by Red Hat for this vulnerability, specifically in the errata RHSA-2024:2298. Upgrading to the latest version of the affected products is critical.
If immediate patching is not possible, consider implementing configuration hardening measures and network controls to mitigate the risks associated with this vulnerability.
Additionally, organizations should monitor their systems for any unusual behavior that may indicate attempts to exploit this vulnerability.
Detection Guidance
To detect potential exploitation attempts, organizations should monitor system logs for any anomalies during the shutdown or reset of the Xvfb server. Look for unusual patterns related to pointer movement and screen transitions.
Monitoring for abnormal resource usage during Xvfb operations may also indicate exploitation attempts.
AppSecure Threat Intelligence Insight
Long-term significance of CVE-2023-5574 emphasizes the necessity for organizations to maintain their systems and apply updates promptly. The pattern of use-after-free vulnerabilities in software development highlights the importance of rigorous memory management practices.
Security teams should learn from this incident to strengthen their vulnerability management programs and ensure that legacy configurations are reviewed and updated regularly.
For further resources on vulnerability management, organizations can refer to guides on vulnerability management and penetration testing methodology to strengthen defenses.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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