CVE-2020-4486 in QRadar
Summary
by MITRE
IBM QRadar 7.2.0 thorugh 7.2.9 could allow an authenticated user to overwrite or delete arbitrary files due to a flaw after WinCollect installation. IBM X-Force ID: 181861.
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Analysis
by VulDB Data Team • 11/07/2020
IBM QRadar versions 7.2.0 through 7.2.9 contain a critical file permission vulnerability that arises from improper handling of file operations following WinCollect installation. This vulnerability stems from insufficient input validation and inadequate access control mechanisms within the system's file management subsystem. The flaw specifically manifests when the WinCollect component is installed, creating a window of opportunity for authenticated users to manipulate file permissions and execute unauthorized file operations. The vulnerability is classified under CWE-276, which addresses improper file permissions, and represents a direct violation of the principle of least privilege in system security design. Attackers with valid credentials can exploit this weakness to overwrite or delete arbitrary files within the system's file structure, potentially compromising system integrity and availability. The vulnerability's impact extends beyond simple file manipulation as it can be leveraged to escalate privileges and gain deeper access to the underlying system infrastructure.
The technical implementation of this vulnerability occurs through a combination of weak file access controls and insufficient validation of user inputs during WinCollect installation processes. When the WinCollect component initializes, it creates temporary file handles and directory structures that are not properly secured against authenticated user manipulation. This flaw allows attackers to craft specific file paths and operations that bypass normal access controls, effectively granting them write permissions to system-critical files that should remain protected. The vulnerability operates at the operating system level where file permissions are improperly configured, making it particularly dangerous as it can be exploited by users who have legitimate access to the QRadar system but should not have the ability to modify core system files. The flaw demonstrates a classic privilege escalation vector through improper access control mechanisms.
The operational impact of this vulnerability extends significantly beyond immediate file corruption or deletion capabilities. An attacker with access to a legitimate user account can potentially compromise the entire QRadar environment by deleting critical log processing files, modifying system configuration settings, or overwriting essential binaries. This vulnerability directly affects the system's ability to maintain audit trails and log integrity, which are fundamental requirements for security monitoring and compliance. The exploitation of this vulnerability can lead to complete system compromise, as it allows attackers to manipulate core system components that govern how the platform processes and stores security events. Organizations relying on QRadar for security information and event management (SIEM) capabilities face significant risk of data loss, operational disruption, and potential compliance violations. The vulnerability also creates opportunities for attackers to establish persistent access within the network by modifying system files that govern user access controls and monitoring capabilities.
Organizations should implement immediate mitigations including applying the official IBM security patches released for this vulnerability, which address the underlying file permission issues in the WinCollect installation process. Network segmentation and access control measures should be enhanced to limit user access to only necessary system components, reducing the potential impact of credential compromise. Regular monitoring of file system changes and access logs should be implemented to detect unauthorized file operations that may indicate exploitation attempts. System administrators should conduct comprehensive audits of file permissions and access controls, particularly focusing on directories created during WinCollect installation processes. The implementation of principle of least privilege access controls and mandatory access controls can significantly reduce the impact of this vulnerability. Additionally, organizations should consider implementing intrusion detection systems that can monitor for anomalous file access patterns and unauthorized file modification activities, as these behaviors are characteristic of exploitation attempts against this specific vulnerability type.