In libxml2 before version 2.10.4, parsing certain invalid XSD schemas can result in a NULL pointer dereference, leading to a segmentation fault. This vulnerability is classified as CVE-2023-28484, with a CVSS score of 6.5, indicating a medium severity level. The nature of this vulnerability presents a risk to the availability of affected systems, especially if exploited over the network.
The vulnerability requires user interaction to trigger, which, while limiting its exploitability, still necessitates immediate attention from security teams. Organizations utilizing affected versions of libxml2 should prioritize patching to prevent potential disruptions.
This vulnerability allows attackers to affect the availability of systems running libxml2 by causing a crash, which could be exploited in denial-of-service attacks. Therefore, organizations should assess their exposure to this vulnerability and take appropriate measures to mitigate the risks.
As of the latest intelligence, no public exploits are confirmed, and the vulnerability is not included in the Known Exploited Vulnerabilities (KEV) database. Nevertheless, the potential impact on availability underscores the importance of timely remediation.
Organizations should prioritize patching immediately.
Vulnerability Details
The vulnerability exists in libxml2 before version 2.10.4, specifically in the xmlSchemaFixupComplexType function located in xmlschemas.c. It is classified under CWE-476, which refers to NULL Pointer Dereference. The CVSS score of 6.5 indicates a medium severity level, with high availability impact and no confidentiality or integrity impact.
Technical Analysis
The root cause of this vulnerability is improper handling of certain invalid XSD schemas during parsing. Attackers can exploit this vulnerability by sending specially crafted XML data to the parser, which may cause the application to dereference a null pointer, resulting in a segmentation fault.
The attack vector is network-based, requiring low attack complexity as no special privileges are needed. However, user interaction is required to trigger the vulnerability. The availability impact is high, while confidentiality and integrity impacts are non-existent.
Risk & Impact Analysis
Risk to organizations includes potential denial of service due to the application crashing when processing malicious XML data. The availability impact is significant, particularly for services relying on libxml2 for XML parsing, which could lead to service outages.
Organizations should assess their use of libxml2 and implement the necessary patches as soon as they are available. The urgency is amplified by the potential for exploitation in production environments.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of libxml2 prior to 2.10.4 are affected. Additionally, Debian Linux 10.0 is also vulnerable to this issue. Organizations should ensure they are on the latest version to mitigate risks.
Mitigation & Remediation
To mitigate this vulnerability, organizations should update libxml2 to version 2.10.4 or later. This version addresses the NULL pointer dereference issue. If an immediate patch is not available, consider applying configuration hardening measures and network controls to limit exposure.
For further guidance on penetration testing and vulnerability management, organizations can refer to resources on penetration testing to assess their security posture.
Detection Guidance
Organizations should monitor logs for indicators of exploitation attempts, including unusual XML parsing requests. Behavioral anomalies such as unexpected application crashes or performance degradation should also be investigated.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-28484 lies in its demonstration of how improper input handling in libraries can lead to critical availability issues. This highlights the need for rigorous testing and validation of third-party components.
Security teams should take this as a lesson to enhance their vulnerability management programs, ensuring that all dependencies are regularly updated and assessed for security risks. For comprehensive strategies, organizations may reference our blog on vulnerability management and adopt best practices.
Additionally, understanding the patterns in vulnerabilities like this can inform future security strategies. To stay updated, organizations can explore our resources on penetration testing methodologies as part of their ongoing security assessments.
Finally, engaging in proactive security measures, such as AI security best practices, can further bolster defenses against evolving threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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