CVE-2012-3329 in Bootable Media Creator
Summary
by MITRE
IBM Advanced Settings Utility (ASU) through 3.62 and 3.70 through 9.21 and Bootable Media Creator (BoMC) through 2.30 and 3.00 through 9.21 on Linux allow local users to overwrite arbitrary files via a symlink attack on a (1) temporary file or (2) log file.
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Analysis
by VulDB Data Team • 01/31/2018
The vulnerability identified as CVE-2012-3329 affects IBM Advanced Settings Utility (ASU) and Bootable Media Creator (BoMC) components across multiple version ranges on Linux systems. This security flaw represents a classic symlink attack vulnerability that enables local attackers to manipulate file operations through carefully crafted symbolic link manipulations. The affected software versions include ASU through 3.62 and 3.70 through 9.21, alongside BoMC through 2.30 and 3.00 through 9.21, creating a significant attack surface for privilege escalation and data manipulation.
The technical implementation of this vulnerability stems from improper handling of temporary and log files during software execution. When these utilities create or modify files in temporary directories, they fail to validate whether the target file paths are legitimate or if they point to symbolic links that could be manipulated by local users. This insecure file creation pattern allows attackers to establish malicious symbolic links in the same directories where the utilities expect to create temporary or log files, effectively enabling arbitrary file overwrite operations. The vulnerability manifests when the software performs operations on these files without proper validation of the file system state, creating a race condition scenario where the symbolic link can be exploited before or during file creation.
From an operational perspective, this vulnerability poses significant risks to system integrity and security posture. Local users can leverage this weakness to overwrite critical system files, configuration files, or log data with malicious content, potentially leading to privilege escalation, system compromise, or data corruption. The impact extends beyond simple file manipulation as attackers could overwrite system binaries, configuration files, or log entries that might be processed by other system components, creating cascading security implications. The vulnerability's exploitation requires local access but does not require special privileges beyond what a standard user already possesses, making it particularly dangerous in multi-user environments.
The vulnerability maps directly to CWE-377: Insecure Temporary File and CWE-59: Improper Link Resolution, both of which are fundamental security weaknesses in file system operations. From an ATT&CK framework perspective, this vulnerability aligns with T1059.007: Command and Scripting Interpreter: Python and T1548.001: Abuse Elevation Control Mechanism: Bypass User Account Control, as it provides a means for local privilege escalation and system manipulation. The attack vector specifically corresponds to T1068: Exploitation for Privilege Escalation, where local users can leverage insecure file handling to gain elevated privileges or manipulate system components.
Mitigation strategies should focus on implementing proper file system validation and secure temporary file creation practices. Organizations should ensure that all temporary and log file operations use secure methods such as creating files with exclusive access permissions, using proper directory permissions, and implementing atomic file creation operations. The recommended approach includes using the mkstemp() function or similar secure file creation mechanisms that prevent symbolic link manipulation. Additionally, system administrators should apply the latest security patches from IBM, conduct regular security audits of affected systems, and monitor for suspicious file system activities in temporary directories. Network segmentation and privilege separation should also be implemented to limit the potential impact of successful exploitation attempts.