CVE-2007-3327 in HTTP Server
Summary
by MITRE
httpsv.exe in HTTP Server 1.6.2 allows remote attackers to obtain sensitive information (script source code) via a URI with a trailing %20 (encoded space).
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Analysis
by VulDB Data Team • 02/02/2025
The vulnerability described in CVE-2007-3327 affects the httpsv.exe component of HTTP Server version 1.6.2, representing a critical information disclosure flaw that enables remote attackers to access sensitive script source code through carefully crafted URI requests. This issue stems from improper handling of URL encoding sequences, specifically the trailing %20 character which represents an encoded space. The vulnerability exists within the server's request processing logic where it fails to properly sanitize or validate URI components before serving content, allowing malicious actors to exploit this weakness by appending encoded spaces to script file paths.
The technical implementation of this vulnerability resides in the server's path resolution mechanism, which processes URI requests without adequate input validation. When a request containing a trailing %20 is processed, the server interprets this encoded space character in a way that causes it to traverse directory structures or access files that should remain protected. This behavior creates an information disclosure condition where attackers can retrieve the source code of server-side scripts, potentially exposing sensitive logic, database connection details, and other proprietary code elements. The vulnerability specifically impacts the HTTP Server 1.6.2 implementation and demonstrates a classic path traversal or directory traversal weakness that has been documented across numerous web server implementations over the years.
From an operational perspective, this vulnerability poses significant risks to organizations relying on the affected HTTP Server version, as the disclosure of script source code can lead to comprehensive exposure of application logic and potential attack surface expansion. Attackers can leverage this weakness to understand how applications process requests, identify potential injection points, and develop more sophisticated attacks targeting the underlying system. The impact extends beyond simple information disclosure, as script source code often contains database credentials, API keys, and other sensitive information that could be exploited for further compromise. This vulnerability aligns with CWE-22 Path Traversal and CWE-200 Information Exposure, representing a clear violation of secure coding practices that should prevent unauthorized access to file system resources.
The attack vector for this vulnerability is straightforward and requires minimal technical expertise, making it particularly dangerous in environments where the affected server is publicly accessible. Remote attackers need only craft a URI request with a trailing %20 character appended to script file paths to potentially access sensitive source code files. This weakness can be exploited through standard web browser interactions or automated scanning tools, allowing for rapid reconnaissance of vulnerable systems. Organizations should consider this vulnerability in relation to ATT&CK technique T1592 reconnaissance, where adversaries gather information about target systems to plan further attacks. The combination of information disclosure and potential credential exposure makes this vulnerability particularly attractive to threat actors seeking to escalate privileges or conduct more sophisticated attacks against the compromised environment.
Mitigation strategies for this vulnerability should focus on immediate patching of the HTTP Server 1.6.2 component to address the URI handling flaw. Organizations should implement proper input validation and sanitization measures that prevent encoded characters from being processed in ways that could lead to directory traversal. Additionally, access controls should be enforced to limit direct access to script source files, and web server configurations should be reviewed to ensure that sensitive files are not directly accessible through URL requests. The implementation of web application firewalls and security monitoring systems can help detect and prevent exploitation attempts targeting this specific vulnerability. Regular security assessments and code reviews should be conducted to identify similar weaknesses in other server components and applications, ensuring comprehensive protection against information disclosure vulnerabilities that could compromise system integrity and confidentiality.