CVE-2007-0668 in Solaris
Summary
by MITRE
The Loopback Filesystem (LOFS) in Sun Solaris 10 allows local users in a non-global zone to move and rename files in a read-only filesystem, which could lead to a denial of service.
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Analysis
by VulDB Data Team • 08/28/2019
The vulnerability identified as CVE-2007-0668 resides within the Loopback Filesystem implementation of Sun Solaris 10 operating system, specifically affecting systems configured with non-global zones. This flaw represents a significant security weakness that undermines the fundamental principle of filesystem isolation and read-only protection mechanisms. The Loopback Filesystem, designed to provide read-only access to filesystems from different mount points, fails to properly enforce access controls when operating within the confines of non-global zones, creating an unexpected privilege escalation vector.
The technical flaw manifests through improper handling of file operations within read-only mounted filesystems when accessed from non-global zones. Local users within these restricted zones can exploit a weakness in the LOFS implementation that allows them to perform file move and rename operations on files located within read-only filesystem mounts. This behavior violates the expected security model where read-only filesystems should prevent any modification operations, including file movement and renaming. The vulnerability specifically affects the kernel-level filesystem handling code that manages cross-zone file access permissions.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass potential denial of service conditions within the affected system. When local users successfully manipulate files within read-only mounts, they can disrupt normal system operations by renaming critical system files or moving essential components to locations where they become inaccessible or corrupted. This capability enables attackers to potentially compromise system stability, create service disruptions, or even render certain system functionalities unavailable. The vulnerability is particularly concerning in multi-tenant environments where non-global zones are used to isolate different user groups or applications.
From a cybersecurity perspective, this vulnerability aligns with CWE-276, which addresses improper file permissions and access control mechanisms, and relates to ATT&CK technique T1068, which involves local privilege escalation through kernel vulnerabilities. The flaw demonstrates a failure in the principle of least privilege enforcement and highlights the importance of proper filesystem isolation in virtualized environments. Organizations should consider implementing immediate mitigations including patching the Solaris 10 systems with the appropriate security updates from Oracle, restricting file operations within non-global zones, and monitoring for suspicious file manipulation activities. Additionally, system administrators should review and tighten zone configuration policies to limit the scope of operations that non-global zone users can perform on mounted filesystems. The vulnerability underscores the critical need for comprehensive security testing of kernel-level filesystem operations, particularly in virtualized environments where isolation boundaries must be strictly maintained to prevent lateral movement and privilege escalation attacks.