CVE-2018-1730 in QRadar SIEM
Summary
by MITRE
IBM QRadar SIEM 7.2 and 7.3 is vulnerable to a XML External Entity Injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources. IBM X-Force ID: 147709.
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Analysis
by VulDB Data Team • 06/13/2023
The vulnerability identified as CVE-2018-1730 represents a critical XML External Entity Injection flaw within IBM QRadar SIEM versions 7.2 and 7.3, classified under CWE-611 according to the Common Weakness Enumeration framework. This vulnerability resides in the system's XML processing mechanisms where external entity references are not properly sanitized, creating an attack surface that allows malicious actors to manipulate the parsing behavior of XML data. The flaw specifically manifests when the system processes XML input without adequate validation or sanitization of external entity declarations, enabling attackers to craft malicious XML payloads that can trigger unintended system behavior.
The technical exploitation of this XXE vulnerability enables remote attackers to perform information disclosure attacks by referencing external entities that can expose internal system information, file contents, or network resources that would normally be protected. The attack vector operates through the manipulation of XML parsers within the QRadar SIEM environment, where the system's failure to restrict external entity resolution creates opportunities for attackers to access sensitive data through techniques such as file retrieval, port scanning, or even server-side request forgery. The vulnerability's impact extends beyond mere information disclosure as it can also facilitate resource exhaustion attacks by consuming memory resources through malicious entity references that cause the system to process excessive data or trigger recursive entity expansion.
From an operational perspective, this vulnerability poses significant risks to security monitoring and incident response capabilities within organizations relying on QRadar SIEM for threat detection and management. The exposure of sensitive information through XXE attacks can compromise the integrity of security event logs, potentially allowing attackers to discover system configurations, user credentials, or other confidential data that would normally be protected within the SIEM environment. The resource consumption aspect of this vulnerability can lead to denial of service conditions that impact the availability of critical security monitoring functions, potentially leaving organizations vulnerable to undetected security incidents during periods of active exploitation. This threat scenario aligns with ATT&CK technique T1566.001 for initial access through spearphishing attachments and T1071.004 for application layer protocol usage, as the attack leverages XML processing mechanisms to achieve its objectives.
Organizations utilizing affected QRadar SIEM versions should implement immediate mitigations including disabling external entity resolution in XML parsers, implementing proper input validation for all XML data processing, and restricting network access to XML processing endpoints. The recommended approach involves configuring XML parsers to reject external entity declarations and implementing strict input sanitization measures that prevent malicious XML content from being processed. Additionally, network segmentation and access controls should be strengthened to limit potential attack vectors, while regular security assessments should verify that all XML processing components have been properly patched and configured according to IBM security advisories. The vulnerability demonstrates the importance of proper XML security configuration and highlights the need for comprehensive input validation across all data processing components within security information and event management systems.