CVE-2012-4417 in GlusterFS
Summary
by MITRE
GlusterFS 3.3.0, as used in Red Hat Storage server 2.0, allows local users to overwrite arbitrary files via a symlink attack on temporary files with predictable names.
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Analysis
by VulDB Data Team • 04/22/2017
The vulnerability identified as CVE-2012-4417 affects GlusterFS version 3.3.0, specifically impacting Red Hat Storage Server 2.0 implementations. This security flaw represents a classic symlink attack vector that exploits predictable temporary file naming conventions within the file system management framework. The vulnerability manifests when local users can manipulate symbolic links to target arbitrary files for overwriting, creating a significant risk for system integrity and data confidentiality.
The technical root cause of this vulnerability stems from inadequate temporary file handling mechanisms within GlusterFS operations. When the system creates temporary files during normal processing operations, it generates these files with predictable naming patterns that can be anticipated by local attackers. This predictable naming scheme allows malicious users to establish symbolic links with the same names before the legitimate system processes create their temporary files, effectively redirecting the system's file creation operations to overwrite files of their choosing. The vulnerability operates at the file system level where proper atomic operations and secure temporary file creation procedures are not adequately enforced.
From an operational perspective, this vulnerability presents a serious threat to systems running affected GlusterFS versions as it enables local privilege escalation and arbitrary file manipulation capabilities. Attackers with local access can leverage this flaw to overwrite critical system files, configuration data, or user information, potentially leading to complete system compromise or data loss. The impact extends beyond simple file overwrites as it can be used to modify system binaries, configuration files, or log data, creating persistent backdoors or hiding malicious activities. This vulnerability is particularly concerning in enterprise environments where GlusterFS serves as a primary storage solution and where local user access might be more prevalent than expected.
The vulnerability aligns with CWE-377, which addresses insecure temporary file creation, and represents a specific instance of insecure file handling practices that violate fundamental security principles. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and persistence mechanisms through file system manipulation. Organizations should implement immediate mitigations including patching to newer GlusterFS versions that address predictable temporary file naming, implementing proper file system permissions, and conducting thorough security reviews of temporary file handling processes. Additionally, system administrators should monitor for suspicious file creation patterns and implement logging mechanisms to detect potential symlink attacks. The recommended remediation includes upgrading to patched versions of GlusterFS where temporary file creation uses secure methods with random naming conventions and proper atomic operations to prevent race conditions that enable such attacks.