CVE-2019-4556 in QRadar Advisor
Summary
by MITRE
IBM QRadar Advisor 1.0.0 through 2.4.0 uses incomplete blacklisting for input validation which allows attackers to bypass application controls resulting in direct impact to the system and data integrity. IBM X-Force ID: 166205.
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Analysis
by VulDB Data Team • 02/11/2024
IBM QRadar Advisor version 1.0.0 through 2.4.0 contains a critical input validation vulnerability that stems from an incomplete blacklisting approach in its security controls. This vulnerability resides in the application's defense mechanisms that are designed to prevent unauthorized access and data manipulation. The flaw manifests when the system employs a restrictive list of characters or patterns to block potentially malicious input, but fails to account for all possible bypass techniques that attackers can employ. This incomplete blacklisting approach creates a pathway for threat actors to circumvent the intended security controls, effectively allowing them to inject malicious code or data into the system. The vulnerability is particularly concerning because it directly impacts the system's ability to maintain data integrity and can result in unauthorized access to sensitive information. According to the ATT&CK framework, this weakness maps to technique T1059.001 (Command and Scripting Interpreter: PowerShell) and T1078.004 (Valid Accounts: Cloud Accounts) as attackers can leverage this vulnerability to escalate privileges and gain persistent access. The CWE (Common Weakness Enumeration) classification for this vulnerability falls under CWE-20, which represents Improper Input Validation, and specifically aligns with CWE-1021, which addresses Incomplete Blacklist Validation. The security implications extend beyond simple input sanitization issues, as the vulnerability creates opportunities for attackers to manipulate system behavior through crafted inputs that bypass the application's protective measures. This type of vulnerability is particularly dangerous in security monitoring platforms like QRadar Advisor where data integrity and system availability are paramount for effective threat detection and response operations.
The operational impact of CVE-2019-4556 is significant for organizations relying on IBM QRadar Advisor for security analytics and threat intelligence. When exploited, this vulnerability can allow attackers to inject malicious payloads that may alter or corrupt data within the system, potentially leading to false security alerts or complete data loss. The incomplete blacklisting approach means that attackers can bypass multiple layers of security controls that were designed to prevent unauthorized access to system resources. This vulnerability can be exploited through various attack vectors including web interface manipulation, API calls, and potentially through file upload mechanisms if the application accepts external inputs. The risk is compounded by the fact that QRadar Advisor is typically used in environments where security monitoring and incident response capabilities are critical, making any compromise of the system's integrity potentially devastating to an organization's overall security posture. Organizations may experience unauthorized access to sensitive threat intelligence data, which could result in information leakage that compromises ongoing investigations and defensive operations. The vulnerability also creates opportunities for attackers to establish persistence within the environment by manipulating system configurations or injecting backdoors through the bypassed input validation controls.
Mitigation strategies for CVE-2019-4556 should focus on implementing robust input validation mechanisms that move beyond simple blacklisting approaches to more comprehensive validation techniques. Organizations should immediately apply the vendor-provided security patches and updates for IBM QRadar Advisor to address the root cause of the vulnerability. The recommended approach involves implementing whitelisting controls rather than relying on blacklisting, which aligns with security best practices outlined in NIST SP 800-160 and ISO/IEC 27001 standards. Network segmentation and access controls should be implemented to limit the blast radius of potential exploitation, ensuring that even if an attacker successfully bypasses input validation, they cannot easily move laterally within the network. Regular security assessments and penetration testing should be conducted to identify similar validation weaknesses in other applications and systems within the organization's infrastructure. Additionally, implementing comprehensive logging and monitoring of all system inputs can help detect exploitation attempts and provide forensic evidence for incident response activities. The solution should also include regular security awareness training for administrators and developers to ensure they understand the importance of proper input validation and the risks associated with incomplete blacklisting approaches. Organizations should consider implementing automated vulnerability scanning tools that can identify similar input validation flaws across their entire application portfolio, as this vulnerability is representative of broader security patterns that can affect multiple systems within an enterprise environment. The remediation process must also include thorough testing of the patched system to ensure that the fix does not introduce any regressions or impact legitimate system functionality.