CVE-2016-3980 in Java AS
Summary
by MITRE
The Java Startup Framework (aka jstart) in SAP JAVA AS 7.4 allows remote attackers to cause a denial of service via a crafted HTTP request, aka SAP Security Note 2259547.
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Analysis
by VulDB Data Team • 02/05/2019
The vulnerability identified as CVE-2016-3980 resides within the Java Startup Framework component of SAP Java Application Server version 7.4, specifically affecting the jstart utility that handles HTTP request processing. This flaw represents a denial of service condition that can be exploited by remote attackers through the manipulation of HTTP requests, making it a significant threat to SAP system availability and operational continuity. The vulnerability is documented in SAP Security Note 2259547, which provides official guidance on the identified weakness and its potential impact on enterprise systems relying on SAP Java Application Server infrastructure.
The technical mechanism underlying this vulnerability involves improper input validation within the jstart framework's HTTP request handling process. When a specially crafted HTTP request is submitted to the affected system, the Java Startup Framework fails to properly sanitize or process the malformed input, leading to a condition where the application becomes unresponsive or crashes entirely. This type of flaw falls under the CWE-129 category of Improper Validation of Input, specifically relating to insufficient validation of input data that could lead to service disruption. The vulnerability exploits a weakness in the request parsing logic where the framework does not adequately handle malformed HTTP headers or request parameters, causing the system to enter an unstable state that results in denial of service.
The operational impact of this vulnerability extends beyond simple service interruption, as it can compromise the availability of critical business applications that depend on SAP Java Application Server functionality. Organizations utilizing this framework may experience complete service outages during exploitation attempts, potentially affecting enterprise resource planning systems, customer relationship management platforms, and other mission-critical applications built on the SAP infrastructure. The remote nature of the attack means that threat actors can exploit this vulnerability from external networks without requiring physical access or local system credentials, making it particularly dangerous for organizations with exposed SAP systems. This vulnerability aligns with ATT&CK technique T1499.004 which covers Network Denial of Service attacks, and represents a significant risk to business continuity and operational resilience.
Mitigation strategies for CVE-2016-3980 should include immediate application of the security patch provided by SAP in their Security Note 2259547, which addresses the input validation weakness in the jstart framework. Organizations should also implement network-level protections including firewall rules that restrict access to the affected HTTP endpoints and deploy intrusion detection systems to monitor for suspicious HTTP request patterns. Additionally, system administrators should consider implementing request rate limiting and input validation controls at the application level to reduce the effectiveness of potential exploitation attempts. The vulnerability demonstrates the importance of proper input validation in web application frameworks and highlights the need for comprehensive security testing of enterprise application components, particularly those handling external network communications. Organizations should also conduct thorough vulnerability assessments to identify other potential weaknesses in their SAP infrastructure that could be exploited in similar fashion, ensuring a layered defense approach to protect against denial of service attacks.