CVE-2001-1322 in xinetd
Summary
by MITRE
xinetd 2.1.8 and earlier runs with a default umask of 0, which could allow local users to read or modify files that are created by an application that runs under xinetd but does not set its own safe umask.
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Analysis
by VulDB Data Team • 09/27/2025
The vulnerability identified as CVE-2001-1322 represents a critical security flaw in the xinetd superdaemon service that affects versions 2.1.8 and earlier. This issue stems from the default configuration where xinetd operates with a umask value of 0, creating a fundamental weakness in file permission management that can be exploited by local attackers to gain unauthorized access to sensitive system resources. The xinetd service acts as a superdaemon that manages various network services and applications, making it a prime target for privilege escalation attacks. When applications run under xinetd without explicitly setting their own secure umask values, they inherit this dangerous default setting, potentially exposing system files to unauthorized read or modification attempts.
The technical flaw manifests through the improper handling of file creation permissions within the xinetd execution environment. A umask of 0 allows all file permissions to be set according to the application's explicit settings, bypassing the normal security restrictions that should be enforced by default. This creates a scenario where files created by applications running under xinetd can be accessed by any user on the system, fundamentally undermining the principle of least privilege that is central to secure system administration. The vulnerability is particularly dangerous because it affects the foundational security mechanisms of the system rather than a specific application, making it a widespread concern across all systems running vulnerable versions of xinetd.
The operational impact of this vulnerability extends beyond simple file access issues, as local users can potentially manipulate critical system files that are created during service execution. This could lead to privilege escalation attacks where attackers exploit the weak file permissions to modify system binaries, configuration files, or sensitive data files. The attack surface is broad since xinetd typically manages numerous network services including telnet, ftp, and other protocols that may create temporary files or log data during operation. According to CWE-276, this vulnerability maps directly to improper file permissions, while the ATT&CK framework would categorize this under privilege escalation techniques through insecure file permissions. The vulnerability essentially allows attackers to subvert the normal security boundaries that should protect system integrity and confidentiality.
Mitigation strategies for CVE-2001-1322 involve multiple layers of security implementation to address both the immediate vulnerability and prevent similar issues in the future. System administrators should immediately upgrade to xinetd version 2.1.9 or later, which includes proper default umask handling. Additionally, applications running under xinetd should be explicitly configured to set secure umask values during their initialization process, typically setting umask to 077 or similar restrictive values. Security hardening practices should include regular auditing of file permissions for applications managed by xinetd, implementing mandatory access controls through SELinux or similar frameworks, and monitoring for unauthorized file creation or modification attempts. The solution aligns with security best practices outlined in NIST SP 800-53 and ISO 27001 standards for system configuration management and access control. Organizations should also consider implementing network segmentation and service isolation to limit the potential impact of such vulnerabilities, as well as establishing regular security assessments to identify and remediate similar configuration weaknesses across their infrastructure.