CVE-1999-1560 in Tiger
Summary
by MITRE
Vulnerability in a script in Texas A&M University (TAMU) Tiger allows local users to execute arbitrary commands as the Tiger user, usually root.
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Analysis
by VulDB Data Team • 04/19/2026
The vulnerability described in CVE-1999-1560 represents a critical privilege escalation flaw within the Texas A&M University Tiger system, a widely deployed network administration tool that was prevalent in academic and research environments during the late 1990s. This vulnerability specifically targets the scripting mechanisms within the Tiger software, which was designed to provide remote system administration capabilities for managing Unix-based systems. The flaw enables local attackers to exploit a command injection vulnerability that allows them to execute arbitrary commands with the elevated privileges of the Tiger user, typically root access. This represents a fundamental breakdown in the principle of least privilege and demonstrates how poorly designed script execution mechanisms can create severe security risks. The vulnerability is particularly concerning because it operates at the local level, meaning that an attacker who has already gained access to a system with limited privileges can leverage this weakness to escalate their access to the highest administrative level, effectively compromising the entire system.
The technical implementation of this vulnerability stems from inadequate input validation and improper command construction within the Tiger script execution framework. When the Tiger system processes user input or configuration parameters, it fails to properly sanitize or escape special characters that could be interpreted as command delimiters or operators. This creates an environment where malicious input can be injected into command execution contexts, allowing attackers to append or modify commands that should normally be restricted. The flaw likely resides in how the system handles command line arguments or script parameters, where user-controlled data is directly concatenated into system commands without proper sanitization. This type of vulnerability is classified as a command injection weakness under CWE-77 and represents a subset of the broader CWE-94 category for Code Injection vulnerabilities. The attack vector is particularly insidious because it requires minimal privileges to exploit, making it a preferred target for attackers who have already gained access to a system through other means.
The operational impact of this vulnerability extends far beyond simple privilege escalation, as it fundamentally undermines the security posture of any system running the vulnerable version of Tiger software. Once an attacker successfully exploits this vulnerability, they gain complete control over the target system, including the ability to modify system files, install malicious software, steal sensitive data, or establish persistent backdoors. The implications are severe for academic institutions and research organizations that rely on such systems for managing their network infrastructure, as these environments often contain sensitive research data, personal information, and critical system configurations. The vulnerability also demonstrates the broader risk of legacy system management, where software that has been in production for years may contain undiscovered security flaws due to inadequate security testing or patch management processes. Organizations using such systems face potential regulatory compliance issues, as this type of vulnerability could lead to data breaches that violate privacy laws and security standards. The attack is particularly effective in environments where the Tiger system is used for remote administration, as it allows attackers to maintain access even after initial compromise, creating a persistent threat that can be difficult to detect and remediate.
Mitigation strategies for this vulnerability should include immediate patching of the affected Tiger software to address the command injection flaw through proper input validation and sanitization. System administrators should implement comprehensive access controls and privilege management to limit local user access to only necessary system functions, following the principle of least privilege as outlined in cybersecurity frameworks such as NIST SP 800-53. Network segmentation and monitoring should be implemented to detect anomalous command execution patterns that might indicate exploitation attempts, leveraging security information and event management systems to track suspicious activities. Additionally, organizations should conduct thorough security assessments of legacy systems to identify similar vulnerabilities that may exist in other components of their infrastructure, as the presence of one vulnerability often indicates potential for others. The vulnerability also highlights the importance of maintaining up-to-date security patches and implementing robust change management processes for system administration tools, as the exploitation of such flaws often occurs due to delayed patch deployment or lack of security awareness among system administrators. Organizations should also consider implementing application whitelisting or script execution controls that prevent unauthorized command execution, particularly in environments where legacy systems must continue to operate while security upgrades are planned.