CVE-2003-1538 in Linux
Summary
by MITRE
susehelp in SuSE Linux 8.1, Enterprise Server 8, Office Server, and Openexchange Server 4 does not properly filter shell metacharacters, which allows remote attackers to execute arbitrary commands via CGI queries.
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Analysis
by VulDB Data Team • 07/17/2024
The vulnerability identified as CVE-2003-1538 resides within the susehelp component of several SuSE Linux distributions including Enterprise Server 8, Office Server, and Openexchange Server 4. This flaw represents a classic command injection vulnerability that arises from inadequate input validation and sanitization within the web-based help system. The vulnerability specifically manifests when the susehelp application processes CGI queries without properly filtering or escaping shell metacharacters, creating a pathway for malicious actors to inject and execute arbitrary commands on the underlying system.
The technical exploitation of this vulnerability occurs through the manipulation of CGI parameters that are passed to the susehelp application. When user-supplied input containing shell metacharacters such as semicolons, ampersands, or backticks is processed by the application, these characters are interpreted by the shell rather than being treated as literal input. This misconfiguration allows attackers to chain commands together and execute arbitrary code with the privileges of the web server process, typically running as the root user or a privileged account. The vulnerability is classified under CWE-77 as "Improper Neutralization of Special Elements used in a Command ('Command Injection')", which is a well-documented weakness in software security that has been consistently exploited across various platforms and applications over many years.
The operational impact of this vulnerability is severe and far-reaching within the affected SuSE environments. An attacker who successfully exploits this vulnerability can gain complete control over the compromised system, potentially leading to unauthorized data access, system compromise, or even lateral movement within a network. The attack surface is particularly concerning as it affects multiple server configurations including enterprise, office, and openexchange server variants, suggesting a widespread exposure across various deployment scenarios. Organizations using these specific versions of SuSE Linux are particularly vulnerable because the flaw exists at the application level within the web interface, making it accessible over the network without requiring special privileges or physical access to the system. The vulnerability's exploitation does not require authentication for the web application itself, making it an attractive target for automated attacks and increasing the potential for widespread compromise.
Mitigation strategies for CVE-2003-1538 should focus on immediate patching of the affected susehelp component, which was addressed in subsequent SuSE updates. Organizations should implement proper input validation and sanitization measures to prevent shell metacharacter injection, following established security practices such as those outlined in the OWASP Top Ten and NIST guidelines for secure coding. Network segmentation and firewall rules should be configured to limit access to the affected web applications, while monitoring systems should be deployed to detect suspicious CGI query patterns that might indicate exploitation attempts. Additionally, organizations should conduct regular vulnerability assessments and security audits to identify similar injection vulnerabilities in other applications and services. The ATT&CK framework categorizes this type of vulnerability under T1059.001 "Command and Scripting Interpreter: Shell Script" as part of the execution phase, highlighting the importance of preventing command injection attacks through proper input handling and privilege separation. Regular security training for developers and system administrators is essential to prevent similar issues in future software development cycles and to ensure proper security practices are maintained across all system components.