CVE-2003-0382 in Eterm
Summary
by MITRE
Buffer overflow in Eterm 0.9.2 allows local users to gain privileges via a long ETERMPATH environment variable.
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Analysis
by VulDB Data Team • 04/22/2019
The vulnerability described in CVE-2003-0382 represents a classic buffer overflow flaw that existed within the Eterm terminal emulator version 0.9.2. This particular implementation flaw allowed local attackers to escalate their privileges by manipulating the ETERMPATH environment variable, which served as a critical entry point for exploitation. The vulnerability was particularly concerning because it leveraged the trust model inherent in Unix-like systems where local users could potentially exploit weaknesses in application handling of environment variables to achieve unauthorized privilege escalation.
The technical implementation of this buffer overflow occurred when the Eterm application processed the ETERMPATH environment variable without proper bounds checking. This environment variable typically contains a list of directories where the terminal emulator would search for various resources and executables. When a local user provided an excessively long ETERMPATH value, the application failed to validate the input length, allowing memory corruption to occur in the buffer allocated for storing this variable. The overflow occurred in the stack memory region, causing the overwrite of adjacent memory locations including return addresses and control information that governed program execution flow.
From an operational perspective, this vulnerability created a significant security risk for systems running Eterm 0.9.2, particularly in multi-user environments where local privilege escalation could lead to complete system compromise. The local nature of the attack meant that any user with access to the system could potentially exploit this flaw, making it a critical concern for system administrators. The privilege escalation achieved through this vulnerability could allow attackers to execute arbitrary code with elevated privileges, potentially leading to complete system takeover or data exfiltration. This type of vulnerability directly violates the principle of least privilege and undermines the security model of Unix-like operating systems.
The vulnerability aligns with CWE-121, which describes heap-based and stack-based buffer overflow conditions, and represents a classic example of improper input validation. From an attacker's perspective, this flaw maps to ATT&CK technique T1068, which involves the exploitation of vulnerabilities to gain elevated privileges. The exploitation process required minimal prerequisites and could be automated, making it particularly dangerous in environments where Eterm was commonly used. The vulnerability also demonstrates the importance of proper memory management and input validation in application security, as the flaw existed in the basic string handling mechanisms of the application.
Mitigation strategies for this vulnerability included immediate patching of the Eterm application to version 0.9.3 or later, which contained proper bounds checking for environment variable processing. System administrators should have implemented strict input validation policies and environment variable sanitization procedures. Additionally, privilege separation mechanisms and mandatory access controls could have limited the impact of such exploitation attempts. Regular security audits and vulnerability assessments would have identified this weakness before exploitation, highlighting the importance of maintaining up-to-date software versions and implementing comprehensive security monitoring practices. The vulnerability also underscored the necessity of secure coding practices, particularly in handling environment variables and user inputs, which should be validated against expected length and content constraints to prevent similar buffer overflow conditions.