CVE-2001-1383 in Linux
Summary
by MITRE
initscript in setserial 2.17-4 and earlier uses predictable temporary file names, which could allow local users to conduct unauthorized operations on files.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 04/14/2019
The vulnerability identified as CVE-2001-1383 resides within the initscript component of setserial version 2.17-4 and earlier releases, presenting a significant security risk through its use of predictable temporary file names. This flaw specifically affects systems that utilize the setserial utility for serial port configuration and management, where the initscript component is responsible for initializing serial port parameters during system boot or configuration changes. The predictable naming convention of temporary files creates an exploitable condition that allows local attackers to manipulate or gain unauthorized access to system resources through carefully crafted file operations. The vulnerability is classified under CWE-377 as "Insecure Temporary File Creation" and represents a classic example of a race condition attack vector where adversaries can predict and potentially overwrite temporary files used by the vulnerable system component.
The technical implementation of this vulnerability stems from the initscript's failure to utilize secure temporary file creation mechanisms when handling serial port configuration data. When the setserial utility executes its initialization process, it generates temporary files with predictable names that follow a discernible pattern based on system parameters, process identifiers, or timestamp values. This predictable naming scheme enables attackers to create symbolic links or directly place malicious files with the same names before the legitimate temporary file is created, thereby intercepting or modifying the intended operations. The flaw operates at the operating system level where temporary files are created without proper security controls such as secure file creation modes, unique naming conventions, or proper file permission settings that would prevent unauthorized access or manipulation by local users.
The operational impact of CVE-2001-1383 extends beyond simple privilege escalation to encompass potential system compromise and data integrity violations within environments that rely on serial port communications. Local attackers with basic system access can exploit this vulnerability to execute unauthorized operations including but not limited to privilege escalation, data corruption, or information disclosure through manipulation of serial port configuration files. The attack vector is particularly concerning in multi-user environments where the predictable temporary file names can be exploited by any user with access to the system, potentially allowing for persistent access or privilege elevation. This vulnerability aligns with ATT&CK technique T1068 which covers "Local Privilege Escalation" through the exploitation of insecure temporary file handling mechanisms, and T1059 which addresses "Command and Scripting Interpreter" usage in executing malicious code through compromised system utilities.
Mitigation strategies for CVE-2001-1383 primarily focus on updating to patched versions of setserial where the initscript component properly implements secure temporary file creation practices. System administrators should immediately upgrade to setserial versions that address this vulnerability by incorporating secure file naming conventions, utilizing unique identifiers for temporary files, and implementing proper file permission controls during temporary file creation. Additional defensive measures include implementing proper file system permissions and access controls to limit potential exploitation, monitoring for suspicious temporary file creation patterns, and conducting regular security assessments of system initialization scripts. The vulnerability demonstrates the critical importance of secure coding practices in system utilities and the necessity of following security guidelines such as those outlined in the Open Web Application Security Project (OWASP) secure coding practices, which emphasize the need for secure temporary file handling to prevent predictable naming attacks that can lead to privilege escalation and unauthorized system access. Organizations should also consider implementing automated vulnerability scanning tools that can identify and flag similar insecure temporary file creation patterns within their system components and applications.