August 2018 - Layer Seven Security

SolMan-SIEM Integration for Advanced Threat Detection

Layer Seven Security on August 26, 2018

SAP Solution Manager monitors real-time event information in SAP logs to automatically detect and trigger alerts for specific Indicators of Compromise (IOCs). This includes events written to the security audit log, system log, gateway server log, change document log, HTTP log, transaction log, SAProuter log, Java security log and the HANA audit log. Alerts are managed in the Alert Inbox or the System Monitoring app of SAP Solution Manager and automatic email and SMS notifications are triggered for critical incidents. Alerts are integrated with Guided Procedures to support an end-to-end process for incident detection and response within Solution Manager.

The data collection for event monitoring using Solution Manager is performed using existing RFC connections and Diagnostics Agents installed in managed systems. Since Diagnostics Agents can be installed in both SAP and non-SAP systems and components, Solution Manager can perform many of the functions of a Security Information and Event Management (SIEM) system. SolMan can monitor across the technology stack including database, operating system, and application layers, as well as network components such as routers, switches and firewalls. These areas are often monitored by organizations using existing SIEM platforms. Therefore, SolMan is more commonly used for application-level monitoring.

SIEM platforms support direct monitoring of SAP log files, tables and other data sources. However, there are several drawbacks with this approach. One of the drawbacks is that each data source within every target system must be connected separately to SIEM platforms. This increases deployment times and complexities. Once connected, rules and patterns must be defined in the platforms for every possible event. Also, since SIEM platforms are ingesting raw logs, the cost of monitoring and storing mammoth-sized logs for multiple SAP systems can be prohibitive, especially for large landscapes.

SAP Solution Manager overcomes these drawbacks by parsing log files and tables and filtering events before forwarding alerts to SIEM platforms. This enables the platforms to avoid ingesting raw logs to monitor SAP event information. Since the event data forwarded to SIEM platforms is derived from a single source for all SAP systems in a landscape, deployment is also faster and less complex. Finally, Solution Manager structures and enriches the event data before it reaches SIEM platforms to reduce the need to develop rules and patterns to interpret SAP event information.

Solution Manager can integrate with SIEM platforms through several ways. The most common is using OS commands that are called by SolMan to write event data to external files that are ingested by SIEM solutions. Alerts are written to external files as soon as they are triggered by SolMan. Alert fields can include the alert name, description, priority, date, time, SAP System ID, and other areas.

This process integrates alerts for IOCs and other security risks detected by SolMan for SAP applications with SIEM systems for centralized monitoring and cross-platform correlation. The example below is for Splunk Enterprise. Click on the images below to enlarge.

SAP Security Notes, July 2018

Zarah Basilio on August 7, 2018

Notes 2017041 and 2016974 patch high-risk information disclosure vulnerabilities in SAP Environment, Health & Safety Management (EHSM). The vulnerabilities could be exploited to leak sensitive information stored or processed by the transactional Fiori apps Inspect Safety Controls and Retrieve Safety Information. The apps support the performance and tracking of safety control inspections.

Note 2641674 provides corrections to support virus scanning for OData v2 connections in the SAP Gateway using the SAP Virus Scan Interface (VSI). This will protect against the insertion of untrusted files and malware.

Note 2597913 includes a kernel patch to remove a Denial of Service vulnerability in the SAP Gateway that could enable attackers to provoke resource exhaustion by flooding specific services. The relatively low CVSS score for the note is misleading. Exploitation of the vulnerability requires network-level access only and does not require any privileges in the system. Furthermore, the impact in terms of system availability is high.

Note 2622434 removes passwords in route strings that are forwarded from one SAProuter to another. Route strings define permitted connections, users and services between hosts. The leakage of passwords could lead to targeted attacks against the SAProuter.

Finally, Note 2664767 removes the logging of sensitive data in logs for SAP Dynamic Authorization Management (DAM) by NextLabs. DAM supports attribte or policy-bsed control to manage user privileges.