CVE-2018-1427 in DB2
Summary
by MITRE
IBM GSKit (IBM DB2 for Linux, UNIX and Windows 9.7, 10.1, 10.5, and 11.1) contains several environment variables that a local attacker could overflow and cause a denial of service. IBM X-Force ID: 139072.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 02/22/2023
IBM GSKit represents a critical cryptographic toolkit component within IBM DB2 database systems across multiple platform architectures. This vulnerability specifically targets the insecure handling of environment variables within the GSKit framework, creating a potential avenue for local privilege escalation and system disruption. The flaw manifests when certain environment variables exceed their intended buffer sizes, leading to stack corruption and subsequent system instability. Attackers exploiting this weakness can manipulate variables such as GSKit-specific parameters that control cryptographic operations and certificate handling processes, ultimately resulting in denial of service conditions that compromise database availability.
The technical implementation of this vulnerability stems from inadequate input validation and buffer management within the GSKit library routines. When environment variables exceed predefined memory allocations, the system experiences stack overflow conditions that can trigger program termination or system crashes. This behavior aligns with common software security principles where improper buffer handling creates exploitable conditions for denial of service attacks. The vulnerability affects multiple IBM DB2 versions including 9.7, 10.1, 10.5, and 11.1 across Linux, UNIX, and Windows operating systems, indicating a widespread impact within IBM database deployments. The flaw operates at the system level rather than application level, making it particularly dangerous as it can affect core database services and potentially compromise entire database environments.
From an operational perspective, this vulnerability presents significant risks to database availability and system integrity within enterprise environments. Local attackers with access to system resources can exploit the buffer overflow conditions to disrupt database services, potentially causing extended downtime and data accessibility issues. The impact extends beyond simple service disruption as database systems may become unstable, requiring manual intervention for recovery and system restarts. Organizations running IBM DB2 deployments across multiple platforms face increased risk exposure, particularly in environments where database availability is critical for business operations. The vulnerability's exploitation requires local system access, but once achieved, it can cause cascading effects throughout database infrastructure and associated applications that depend on stable database connectivity.
Security mitigation strategies should prioritize immediate patch application from IBM to address the buffer overflow conditions in GSKit components. System administrators must implement comprehensive monitoring to detect unusual environment variable modifications that might indicate exploitation attempts. The vulnerability demonstrates the importance of secure coding practices and proper input validation as outlined in CWE-121 and CWE-122 categories for buffer overflow conditions. Organizations should also consider implementing privilege separation and least-privilege access controls to limit potential exploitation scope. Network segmentation and access controls can help reduce the attack surface for local privilege escalation attempts, while regular security assessments should verify proper environment variable handling within cryptographic libraries. The remediation process requires careful testing of patches to ensure compatibility with existing database configurations and applications relying on GSKit functionality, as improper patching can introduce additional stability issues within database environments.