CVE-2000-0670 in CVSWeb
Summary
by MITRE
The cvsweb CGI script in CVSWeb 1.80 allows remote attackers with write access to a CVS repository to execute arbitrary commands via shell metacharacters.
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Analysis
by VulDB Data Team • 10/13/2025
The vulnerability described in CVE-2000-0670 represents a critical command injection flaw within the cvsweb CGI script component of CVSWeb version 1.80. This issue stems from inadequate input validation and sanitization mechanisms that fail to properly handle user-supplied data before incorporating it into shell commands. The vulnerability specifically affects systems where the cvsweb CGI script is deployed and accessible to users who possess write permissions within the CVS repository. When such users submit malicious input containing shell metacharacters through the web interface, the script processes these inputs without proper sanitization, leading to arbitrary command execution on the underlying system.
The technical exploitation of this vulnerability occurs through the manipulation of input parameters that are directly passed to shell commands within the cvsweb script. This type of flaw falls under the Common Weakness Enumeration category CWE-78, which specifically addresses improper neutralization of special elements used in OS commands. The vulnerability demonstrates a classic command injection attack vector where user-controllable data flows directly into shell execution contexts without proper validation or escaping. Attackers can leverage this weakness to execute arbitrary system commands with the privileges of the web server process, potentially leading to complete system compromise.
The operational impact of CVE-2000-0670 extends beyond simple unauthorized command execution, as it provides attackers with a powerful foothold within the system infrastructure. Since the vulnerability requires only write access to a CVS repository, it can be exploited by insiders or compromised users with repository write privileges, making it particularly dangerous in environments where multiple developers have repository access. The consequences can include data exfiltration, system enumeration, privilege escalation, and persistent backdoor installation. This vulnerability directly aligns with ATT&CK technique T1059.001 for command and scripting interpreter, specifically targeting the execution of system commands through the web interface.
Mitigation strategies for this vulnerability should focus on immediate remediation through patching the CVSWeb software to version 1.81 or later, which contains the necessary input validation fixes. Additionally, implementing proper input sanitization and escaping mechanisms within the CGI script is essential to prevent shell metacharacter interpretation. Organizations should consider implementing network segmentation to limit access to the cvsweb interface and enforce least privilege principles for CVS repository access. The implementation of web application firewalls and input validation controls can provide additional defense-in-depth measures. Regular security assessments and vulnerability scanning should be conducted to identify similar command injection vulnerabilities in other web applications and system components, ensuring comprehensive protection against this class of attack.