CVE-2014-9114 in util-linux
Summary
by MITRE
Blkid in util-linux before 2.26rc-1 allows local users to execute arbitrary code.
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Analysis
by VulDB Data Team • 12/04/2025
The vulnerability identified as CVE-2014-9114 affects the blkid utility within util-linux versions prior to 2.26rc-1, representing a critical security flaw that enables local attackers to execute arbitrary code on affected systems. This vulnerability resides within the disk labeling and identification functionality that blkid provides, which is fundamental to Linux system operations and is widely utilized by various system components including mount utilities, udev, and system initialization scripts. The flaw stems from insufficient input validation and improper handling of specially crafted filesystem labels or device identifiers that can be processed by blkid during its operation.
The technical implementation of this vulnerability involves a buffer overflow condition that occurs when blkid processes malformed or excessively long device identifiers or filesystem labels. When the utility encounters such inputs, particularly through the processing of device information from /proc/mounts or other system interfaces, it fails to properly validate the length of incoming data before copying it into fixed-size buffers. This behavior creates an exploitable condition where an attacker can craft malicious input that overflows these buffers and potentially overwrites adjacent memory regions, including return addresses on the stack. The vulnerability is particularly concerning because blkid is frequently invoked during system boot processes, by udev rules, and through various automated scripts, making it accessible to local users who might not have elevated privileges.
The operational impact of this vulnerability extends beyond simple code execution, as it can be leveraged to escalate privileges or compromise entire system operations. Since blkid is a core utility that many system processes depend upon, an attacker who successfully exploits this vulnerability can potentially manipulate how the system identifies and mounts filesystems, leading to privilege escalation or system compromise. The attack vector is particularly dangerous because it requires only local user access, making it difficult to detect and defend against in environments where local access is not strictly controlled. This vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and can be mapped to ATT&CK technique T1068, which covers 'Exploitation for Privilege Escalation' through local system exploitation.
Mitigation strategies for this vulnerability primarily focus on immediate patching of util-linux to version 2.26rc-1 or later, which contains the necessary fixes for the buffer overflow conditions. System administrators should also implement additional security controls such as restricting local access to system resources, monitoring for unusual blkid activity, and ensuring that system updates are applied promptly. The vulnerability demonstrates the critical importance of input validation in system utilities and highlights how seemingly benign tools can become attack vectors when proper security measures are not implemented. Organizations should also consider implementing runtime protections such as stack canaries, address space layout randomization, and non-executable stack protections to reduce the effectiveness of potential exploitation attempts. Regular security assessments of core system utilities and maintaining up-to-date system configurations are essential practices to prevent similar vulnerabilities from being exploited in production environments.