CVE-2018-1799 in DB2
Summary
by MITRE
IBM DB2 for Linux, UNIX and Windows (includes DB2 Connect Server) 9.7, 10.1, 10.5, and 11.1 could allow a local unprivileged user to overwrite files on the system which could cause damage to the database. IBM X-Force ID: 149429.
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Analysis
by VulDB Data Team • 06/05/2023
This vulnerability affects IBM DB2 database systems across multiple versions including 9.7, 10.1, 10.5, and 11.1 on Linux, UNIX, and Windows platforms. The flaw represents a privilege escalation risk where unprivileged local users can potentially overwrite critical system files, leading to database corruption and system instability. The vulnerability stems from inadequate file permission controls and improper access validation mechanisms within the database server components. According to CWE-276, this manifests as incorrect permissions for critical resources, which directly enables unauthorized file modification operations. The security implications extend beyond simple file overwrites as database integrity and system stability can be severely compromised through this vector.
The technical exploitation of this vulnerability occurs through local system access where attackers can manipulate file operations within the DB2 environment. The flaw allows malicious users to bypass normal access controls and modify system files that should only be accessible to privileged processes. This creates a persistent threat vector that can be leveraged for further attacks including data corruption, system compromise, and potential privilege escalation to root or administrative levels. The vulnerability is particularly concerning because it operates at the file system level rather than through network protocols, making detection more challenging and potentially allowing for stealthy exploitation.
Operational impact of this vulnerability is significant for organizations relying on DB2 database systems, as it creates an attack surface that can be exploited by insider threats or compromised local accounts. The potential for database damage includes corruption of critical system files, disruption of database services, and possible data loss or manipulation. Organizations may experience service interruptions, performance degradation, and increased maintenance requirements as a result of this vulnerability. The attack vector's local nature means that traditional network-based security controls may not prevent exploitation, requiring additional local system security measures. This vulnerability aligns with ATT&CK technique T1068, which covers 'Local Privilege Escalation' through exploitation of system weaknesses.
Mitigation strategies should focus on implementing strict access controls and privilege separation within the DB2 environment. Organizations should ensure that DB2 processes run with minimal required privileges and that file system permissions are properly configured to prevent unauthorized file modifications. Regular security assessments and vulnerability scanning should be conducted to identify and remediate similar issues. System hardening measures including disabling unnecessary services, implementing proper user access controls, and maintaining up-to-date security patches are essential. The vulnerability demonstrates the importance of principle of least privilege enforcement and proper file system security controls as outlined in security frameworks such as NIST SP 800-53. Additionally, organizations should implement monitoring solutions that can detect anomalous file system activity and unauthorized file modifications to provide early warning of potential exploitation attempts.