CVE-2008-1594 in AIX
Summary
by MITRE
The kernel in IBM AIX 5.2 and 5.3 does not properly handle resizing JFS2 filesystems on concurrent volume groups spread across multiple nodes, which allows local users of one node to cause a denial of service (remote node crash) by using chfs or lreducelv to reduce a filesystem s size.
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Analysis
by VulDB Data Team • 08/15/2019
The vulnerability described in CVE-2008-1594 represents a critical flaw in the IBM AIX operating system kernel that affects versions 5.2 and 5.3. This issue manifests within the JFS2 filesystem implementation and specifically targets the handling of filesystem resizing operations across distributed volume groups that span multiple nodes in a cluster environment. The vulnerability exploits a fundamental weakness in the kernel's concurrency management mechanisms when dealing with distributed filesystem operations, creating a scenario where a local user on one node can inadvertently or maliciously disrupt operations on remote nodes within the same cluster.
The technical flaw stems from improper synchronization and handling of JFS2 filesystem resizing operations when multiple nodes share the same volume group. When administrators or users employ commands such as chfs or lreducelv to reduce filesystem sizes, the kernel fails to properly coordinate these operations across the distributed cluster environment. This lack of proper coordination leads to race conditions and inconsistent state management between nodes, ultimately resulting in kernel panics or system crashes on remote nodes that are part of the same volume group. The vulnerability specifically targets the kernel's handling of concurrent filesystem operations and demonstrates a failure in the distributed locking mechanisms that should prevent conflicting operations across multiple cluster nodes.
The operational impact of this vulnerability is severe and can result in significant service disruption within IBM AIX cluster environments. Local users with access to one node can leverage this vulnerability to cause remote node crashes, effectively creating a denial of service condition that affects the entire cluster infrastructure. This type of vulnerability is particularly dangerous in enterprise environments where high availability and system stability are critical requirements. The remote node crashes can lead to complete system outages, data loss, and require extensive recovery procedures that may involve cluster reconfiguration and manual intervention to restore normal operations.
From a cybersecurity perspective, this vulnerability aligns with CWE-362, which describes race conditions in concurrent systems, and demonstrates characteristics consistent with ATT&CK technique T1499.001, which involves network denial of service attacks through system resource exhaustion or corruption. The vulnerability represents a classic case of insufficient input validation and improper error handling in distributed systems, where the kernel fails to validate the consistency of operations across multiple nodes before executing potentially disruptive filesystem modifications. Organizations running IBM AIX 5.2 and 5.3 systems should immediately implement mitigations including applying the relevant IBM security patches, implementing strict access controls to limit local user privileges, and monitoring for suspicious filesystem resizing activities that could indicate exploitation attempts. Additionally, system administrators should consider implementing network segmentation and enhanced logging to detect and prevent unauthorized filesystem modifications that could trigger this vulnerability.