A flaw was found in the libxml2 library. This uncontrolled resource consumption vulnerability occurs when processing XML catalogs that contain repeated <nextCatalog> elements pointing to the same downstream catalog. A remote attacker can exploit this by supplying crafted catalogs, causing the parser to redundantly traverse catalog chains. This leads to excessive CPU consumption and degrades application availability, resulting in a denial-of-service condition.
The CVSS score for this vulnerability is 2.9, classified as low severity. Despite the low score, organizations should remain vigilant as the risk to availability could impact critical services, particularly in applications heavily utilizing XML processing.
Currently, the vulnerability status is 'Awaiting Analysis', indicating that further investigation is needed to assess the overall impact. Organizations should monitor for updates on this vulnerability and be prepared to implement necessary mitigations.
Risk to organizations includes potential denial-of-service conditions, particularly in environments where XML catalogs are heavily utilized and improperly validated. Organizations should prioritize patching immediately.
Vulnerability Details
The vulnerability is characterized by uncontrolled resource consumption, specifically during the processing of XML catalogs. The attack vector is local, with high attack complexity, and no privileges or user interaction are required.
The availability impact is rated as low, meaning that while the service may be affected, it is not expected to lead to complete unavailability. The flaw is categorized under CWE-400.
Technical Analysis
The root cause of this vulnerability lies in the way libxml2 processes XML catalogs, particularly when faced with repeated <nextCatalog> elements. This design flaw allows an attacker to craft specific catalogs that can cause the parser to enter a loop, consuming CPU resources excessively.
The attack vector is local, requiring access to the system where the application is running. Given the high complexity of the attack, it is not trivial for an attacker to exploit this vulnerability, but it is still a valid concern for environments using this library.
In terms of impact, the vulnerability does not affect confidentiality or integrity, but can lead to low availability. Monitoring for unusual CPU usage patterns may help in early detection of potential exploitation.
Risk & Impact Analysis
While the CVSS score indicates low severity, the real-world implications of this vulnerability can still pose a risk to organizations, particularly those relying on libxml2 for XML processing. Excessive CPU consumption from exploitation can lead to service degradation or outages.
The urgency for remediation is classified as low, allowing organizations to address this in their routine maintenance cycles. However, they should remain vigilant and monitor for any updates regarding this vulnerability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch are affected. Organizations using libxml2 should assess their environments and apply any available patches as they become available.
Mitigation & Remediation
Organizations should prioritize patching immediately. Monitoring for unusual CPU usage is recommended as a precaution. For those unable to apply a patch, consider implementing network controls to limit access to systems using libxml2.
Furthermore, organizations can benefit from a comprehensive penetration testing approach to identify similar weaknesses.
Detection Guidance
Security teams should monitor logs for indicators of unusual CPU usage patterns and inspect systems for any unauthorized access attempts. Behavioral anomalies in application performance can also indicate exploitation attempts.
AppSecure Threat Intelligence Insight
This vulnerability highlights the importance of robust input validation in XML processing systems. Organizations should consider adopting a proactive security posture.
To enhance your security strategy, consider reviewing our vulnerability management program and explore the benefits of cloud penetration testing to identify potential vulnerabilities in your environment.
Finally, organizations are encouraged to stay informed about emerging threats and trends in cybersecurity by following relevant publications and reports.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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