CVE-2016-9597 in JBoss
Summary
by MITRE
It was found that Red Hat JBoss Core Services erratum RHSA-2016:2957 for CVE-2016-3705 did not actually include the fix for the issue found in libxml2, making it vulnerable to a Denial of Service attack due to a Stack Overflow. This is a regression CVE for the same issue as CVE-2016-3705.
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Analysis
by VulDB Data Team • 04/27/2023
The vulnerability identified as CVE-2016-9597 represents a critical regression in the Red Hat JBoss Core Services security patching process, specifically affecting the libxml2 library implementation. This issue stems from an incomplete remediation of the previously identified CVE-2016-3705, which itself was a stack overflow vulnerability that could be exploited to cause denial of service conditions. The flaw manifests in the XML parsing functionality of the affected systems, where improper handling of malformed XML input can trigger stack overflow conditions that ultimately lead to application termination and system unavailability.
The technical root cause of this vulnerability lies within the libxml2 library's XML parser implementation, which fails to properly validate stack usage during recursive parsing operations. When processing specially crafted XML documents containing deeply nested elements or maliciously constructed structures, the parser can exhaust available stack memory, resulting in a stack overflow condition that terminates the application process. This vulnerability operates at the application layer and can be exploited through various attack vectors including web applications, API endpoints, or any system that processes XML input from untrusted sources. The issue falls under CWE-121, which specifically addresses stack-based buffer overflow conditions, and demonstrates the critical importance of thorough regression testing in security patch deployment.
The operational impact of CVE-2016-9597 extends beyond simple service disruption, as it represents a fundamental failure in the security update process that leaves systems vulnerable to targeted denial of service attacks. Attackers can exploit this vulnerability by submitting malicious XML content to applications that utilize the affected libxml2 library, causing the application to crash and potentially leading to extended downtime. This vulnerability is particularly dangerous in enterprise environments where JBoss Core Services are widely deployed, as it can affect multiple applications simultaneously and potentially compromise business continuity. The attack surface is broad, encompassing web services, enterprise applications, and any system that processes XML data, making it a high-priority target for exploitation.
Organizations affected by this vulnerability should immediately implement comprehensive mitigation strategies that include applying the correct security patches from Red Hat, implementing input validation and sanitization measures, and deploying intrusion detection systems to monitor for exploitation attempts. The remediation process must ensure that the complete fix for CVE-2016-3705 is properly applied, rather than relying on partial or incorrect patches. Additionally, system administrators should conduct thorough vulnerability assessments to identify all instances of the affected software and implement network segmentation to limit the potential impact of successful exploitation attempts. This vulnerability demonstrates the critical need for robust patch management processes and continuous security monitoring to prevent such regressions from affecting production environments. The incident also highlights the importance of adhering to security standards such as those outlined in the ATT&CK framework, particularly in the context of privilege escalation and defense evasion techniques that attackers might employ when exploiting such vulnerabilities.