CVE-2001-0215 in Roads
Summary
by MITRE
ROADS search.pl program allows remote attackers to read arbitrary files by specifying the file name in the form parameter and terminating the filename with a null byte.
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Analysis
by VulDB Data Team • 10/08/2025
The vulnerability described in CVE-2001-0215 represents a classic file inclusion flaw that existed within the ROADS search.pl web application. This vulnerability specifically affects the handling of user input through the form parameter mechanism, creating a pathway for remote attackers to access arbitrary files on the server. The flaw stems from inadequate input validation and sanitization within the search.pl script, which processes user-supplied data without proper restrictions on file path traversal or null byte handling. The vulnerability is particularly concerning as it allows attackers to bypass normal file access controls and potentially retrieve sensitive information from the underlying file system.
The technical implementation of this vulnerability leverages null byte injection techniques to manipulate the file reading process within the search.pl program. When a user submits a request containing a filename in the form parameter, the application processes this input without proper validation of special characters including null bytes. By appending a null byte to the filename, attackers can effectively truncate the file path and gain access to files that would normally be protected or restricted. This type of vulnerability falls under the broader category of path traversal attacks and can be classified as a CWE-22 weakness, specifically related to improper limitation of a pathname to a restricted directory. The null byte termination technique exploits the way certain programming languages and operating systems handle string termination, allowing attackers to manipulate the intended file access behavior.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the capability to access potentially sensitive files including configuration files, database credentials, system logs, and other confidential data stored on the server. This vulnerability enables an attacker to perform reconnaissance activities by accessing system files that may contain valuable information about the server environment, installed software, and potential security weaknesses. The remote nature of the attack means that an attacker does not require physical access to the system or local network privileges to exploit this vulnerability. From an attacker's perspective, this represents a critical weakness that can be exploited without authentication, making it particularly dangerous in environments where web applications are not properly secured against input manipulation attacks. The vulnerability can be mapped to ATT&CK technique T1213.002 for credential access through web application attacks and T1083 for file and directory discovery.
Mitigation strategies for this vulnerability involve multiple layers of defense including immediate patching of the affected search.pl script to implement proper input validation and sanitization. The most effective approach involves implementing strict input filtering that rejects or escapes special characters including null bytes, backslashes, and forward slashes that could be used for path manipulation. Additionally, the application should implement proper file access controls that limit the directories from which files can be read and ensure that user input is properly escaped before being used in file system operations. Security measures should include implementing proper access controls, using secure coding practices that prevent direct file path construction from user input, and establishing proper logging and monitoring to detect potential exploitation attempts. Organizations should also consider implementing web application firewalls that can detect and block null byte injection patterns, as well as regular security assessments to identify similar vulnerabilities in other web applications. The vulnerability highlights the importance of following secure coding guidelines and implementing defense-in-depth strategies to protect against injection-based attacks that can compromise system integrity and confidentiality.