CVE-2018-1782 in Spectrum Scale
Summary
by MITRE
IBM GPFS (IBM Spectrum Scale 5.0.1.0 and 5.0.1.1) allows a local, unprivileged user to cause a kernel panic on a node running GPFS by accessing a file that is stored on a GPFS file system with mmap, or by executing a crafted file stored on a GPFS file system. IBM X-Force ID: 148805.
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Analysis
by VulDB Data Team • 05/17/2023
The vulnerability identified as CVE-2018-1782 represents a critical kernel-level flaw within IBM General Parallel File System implementation, specifically affecting versions 5.0.1.0 and 5.0.1.1 of IBM Spectrum Scale. This issue manifests as a local privilege escalation vulnerability that can be exploited by unprivileged users to trigger system-wide kernel panics, effectively causing complete system crashes and service disruptions. The flaw resides in how the file system handles memory mapping operations and execution of crafted files, creating a pathway for malicious users to compromise system stability through seemingly benign file access patterns. The vulnerability is particularly concerning because it operates at the kernel level, bypassing typical user-space security boundaries and potentially allowing attackers to disrupt critical enterprise storage infrastructure.
The technical implementation of this vulnerability stems from improper handling of memory mapping operations within the GPFS kernel modules when processing files stored on the file system. When a local user attempts to access a file using mmap system calls or executes a specially crafted file, the kernel fails to properly validate input parameters and memory access patterns, leading to memory corruption that ultimately results in kernel panic conditions. This behavior aligns with CWE-121, which describes heap-based buffer overflow conditions, and CWE-125, which covers out-of-bounds read vulnerabilities that can lead to memory corruption. The vulnerability's exploitation mechanism demonstrates characteristics consistent with privilege escalation techniques that leverage kernel memory management flaws, making it particularly dangerous in enterprise environments where GPFS is commonly deployed for high-performance computing and data storage operations.
The operational impact of CVE-2018-1782 extends far beyond simple system crashes, as it can lead to complete service disruption for organizations relying on IBM Spectrum Scale for critical data operations. When a kernel panic occurs, the affected node becomes unavailable, potentially causing data unavailability and service interruptions that can cascade across distributed storage clusters. In large-scale deployments, this vulnerability could compromise entire storage pools, forcing administrators to perform emergency node restarts and potentially resulting in data loss or corruption during recovery operations. The vulnerability's local nature means that any user with access to the system can exploit it, making it particularly dangerous in multi-tenant environments or shared computing resources where user isolation is not properly enforced. Organizations using GPFS for mission-critical applications face significant risk of operational downtime and potential data integrity issues when this vulnerability remains unpatched.
Mitigation strategies for CVE-2018-1782 should focus on immediate patch deployment from IBM, as the vendor has released specific fixes for affected versions of IBM Spectrum Scale. Organizations should also implement network segmentation and access controls to limit local user access to GPFS nodes where possible, reducing the attack surface for potential exploitation. System monitoring should be enhanced to detect kernel panic events and unusual memory access patterns that could indicate exploitation attempts. Security teams should also consider implementing privileged access management controls and regular vulnerability assessments to identify similar kernel-level vulnerabilities in other storage systems. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically targeting the kernel-level execution environment. Organizations should conduct thorough impact assessments to determine which systems are vulnerable and prioritize patching based on risk exposure, particularly focusing on nodes that serve as primary storage controllers or contain critical data assets.