CVE-2016-1929 in HANA
Summary
by MITRE
The XS engine in SAP HANA allows remote attackers to spoof log entries in trace files and consequently cause a denial of service (disk consumption and process crash) via a crafted HTTP request, related to an unspecified debug function, aka SAP Security Note 2241978.
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Analysis
by VulDB Data Team • 07/23/2018
The vulnerability identified as CVE-2016-1929 resides within the XS engine component of SAP HANA, a high-performance in-memory database platform widely deployed in enterprise environments. This weakness represents a significant security flaw that enables remote attackers to manipulate system logging mechanisms through carefully crafted HTTP requests. The vulnerability specifically targets an unspecified debug function within the XS engine, which serves as a critical pathway for malicious actors to exploit the system's trace file handling capabilities. The affected SAP HANA systems operate under the assumption that trace file entries are trustworthy, creating a window of opportunity for attackers to inject malicious log entries that appear legitimate to the system's monitoring and logging infrastructure.
The technical exploitation of this vulnerability occurs through HTTP request manipulation that triggers the debug function, allowing attackers to inject forged log entries into the trace files maintained by the XS engine. These spoofed entries can be designed to consume excessive disk space through repetitive or oversized logging content, ultimately leading to disk exhaustion conditions that cause system processes to crash. The flaw leverages the inherent trust model of the system's logging mechanisms, where the XS engine does not adequately validate or sanitize log entry inputs received through HTTP requests. This design oversight creates a condition where attacker-controlled data can be directly written to critical system trace files without proper authorization checks or input validation measures. The vulnerability's impact extends beyond simple log manipulation as the malicious entries can trigger cascading failures within the system's resource management and process monitoring capabilities.
The operational consequences of this vulnerability pose severe risks to SAP HANA deployments, particularly in mission-critical enterprise environments where system availability and data integrity are paramount. Remote attackers can leverage this weakness to consume disk space rapidly through the injection of large volumes of spoofed log entries, potentially leading to complete system outages when storage resources are exhausted. The process crash vulnerability represents a direct threat to system stability, as the XS engine may become unresponsive or terminate unexpectedly when encountering the manipulated trace file contents. This denial of service condition can disrupt business operations, particularly in scenarios where SAP HANA serves as a core component of enterprise applications, ERP systems, or data analytics platforms. The vulnerability's remote exploitability means that attackers can initiate the attack from any location without requiring physical access or local system credentials, making it particularly dangerous for organizations with distributed or cloud-based SAP HANA deployments.
Organizations affected by CVE-2016-1929 should prioritize immediate implementation of SAP Security Note 2241978, which provides specific patches and workarounds to address the debug function vulnerability. System administrators must review and harden HTTP request handling mechanisms within the XS engine to implement proper input validation and sanitization procedures for all trace file entries. The mitigation strategy should include implementing network-level controls to restrict access to debug functions and establishing monitoring protocols to detect unusual patterns in trace file generation. Additionally, organizations should consider implementing disk space quotas and automated alerting systems to prevent complete disk exhaustion scenarios that could lead to process crashes. From a security framework perspective, this vulnerability aligns with CWE-20 General Input Validation and CWE-345 Insufficient Verification of Data Authenticity, while the remote exploitation aspects correspond to ATT&CK techniques involving privilege escalation and denial of service through system manipulation. The incident highlights the critical importance of validating all system inputs, particularly those originating from external sources, and demonstrates how seemingly minor debug functionality can create substantial security risks when not properly secured against malicious input injection.