CVE-2007-4074 in Festival
Summary
by MITRE
The default configuration of Centre for Speech Technology Research (CSTR) Festival 1.95 beta (aka 2.0 beta) on Gentoo Linux, SUSE Linux, and possibly other distributions, is run locally with elevated privileges without requiring authentication, which allows local and remote attackers to execute arbitrary commands via the local daemon on port 1314, a different vulnerability than CVE-2001-0956. NOTE: this issue is local in some environments, but remote on others.
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Analysis
by VulDB Data Team • 07/21/2021
The vulnerability described in CVE-2007-4074 represents a critical privilege escalation and command execution flaw within the Festival speech synthesis system version 1.95 beta. This issue affects multiple Linux distributions including Gentoo and SUSE, where the Festival daemon runs with elevated privileges by default without requiring authentication mechanisms. The daemon listens on port 1314, creating an attack surface that can be exploited by both local and remote adversaries depending on the specific system configuration and network topology. This vulnerability operates under the principle of least privilege violation, where a system service should not run with unnecessary elevated permissions, directly violating security best practices established in standards such as the Common Weakness Enumeration CWE-276 which categorizes improper privilege management as a fundamental security flaw.
The technical implementation of this vulnerability stems from the improper configuration of the Festival daemon process which executes with root or administrative privileges while simultaneously accepting connections from unauthenticated clients. When attackers connect to port 1314, they can send specially crafted commands to the daemon that are executed with the elevated privileges of the running process. This creates a direct path for arbitrary code execution, allowing attackers to perform system-level operations including but not limited to file manipulation, process termination, network reconnaissance, and privilege escalation to full administrative control. The remote exploitability aspect of this vulnerability is particularly concerning as it demonstrates how default configurations can create persistent attack vectors that remain active until explicitly addressed by system administrators.
The operational impact of this vulnerability extends beyond simple command execution to encompass complete system compromise when exploited successfully. Attackers can leverage this vulnerability to establish persistent backdoors, exfiltrate sensitive data, or deploy additional malicious payloads. The fact that this vulnerability exists in default installations across multiple distributions indicates a widespread security risk affecting numerous systems that may not be actively monitored for such configuration issues. This flaw directly maps to ATT&CK technique T1068 which describes privilege escalation through exploitation of system configuration weaknesses, and T1059 which covers execution through command and scripting interpreters. The vulnerability's classification as local in some environments but remote in others demonstrates the complexity of modern attack surface analysis and the importance of comprehensive security audits.
Mitigation strategies for this vulnerability require immediate attention from system administrators to address the root cause through proper privilege management and daemon configuration. The primary solution involves running the Festival daemon with reduced privileges or implementing authentication mechanisms before allowing remote connections. Administrators should consider disabling the daemon entirely if it is not required for system operations, or alternatively, configure the service to run under a dedicated low-privilege user account with minimal necessary permissions. Network segmentation and firewall rules can be implemented to restrict access to port 1314 to trusted sources only, while regular security audits should verify that no other services are running with unnecessary elevated privileges. Additionally, system hardening procedures should be implemented to ensure that default installations do not contain security vulnerabilities, aligning with security frameworks such as the Center for Internet Security (CIS) benchmarks and the NIST Cybersecurity Framework. Regular patch management and vulnerability scanning processes should be established to identify similar configuration issues across the entire infrastructure rather than relying on reactive security measures.