CVE-2001-1048 in AWOL
Summary
by MITRE
AWOL PHP script allows remote attackers to include arbitrary files from remote web sites via an HTTP request that sets the includedir variable.
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Analysis
by VulDB Data Team • 09/30/2025
The vulnerability described in CVE-2001-1048 represents a classic remote file inclusion flaw that was prevalent during the early 2000s web application security landscape. This issue affects AWOL PHP scripts and demonstrates how insecure parameter handling can lead to severe remote code execution capabilities for attackers. The vulnerability specifically exploits the lack of proper input validation in the includedir variable, which is typically used to specify directories from which files should be included or imported into the running PHP script.
The technical flaw stems from the script's improper sanitization of user-supplied input that is directly used to construct file inclusion paths. When an attacker manipulates the includedir parameter through an HTTP request, they can potentially inject external URLs that point to malicious files hosted on remote servers. This creates a scenario where the PHP interpreter will fetch and execute code from these remote locations, effectively allowing attackers to execute arbitrary commands on the vulnerable server. The vulnerability is particularly dangerous because it can be exploited without requiring any authentication or local access to the target system, making it a prime target for automated attacks.
The operational impact of this vulnerability extends beyond simple code execution, as it can enable full system compromise when combined with other attack vectors. An attacker could potentially upload malicious PHP shells, backdoors, or other exploit code that would persist on the server and allow continued unauthorized access. The vulnerability also poses risks to data integrity and confidentiality, as attackers could potentially access sensitive information stored on the server or manipulate database contents through the included remote files. This type of vulnerability is categorized under CWE-94, which represents "Improper Control of Generation of Code ('Code Injection')" and aligns with ATT&CK technique T1190 for "Exploit Public-Facing Application" and T1059 for "Command and Scripting Interpreter" as attackers leverage the included code to execute commands on the target system.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and sanitization mechanisms. The most effective approach involves rejecting any input that contains external URL schemes or protocols, particularly http, https, ftp, and other remote access protocols. Developers should employ whitelisting techniques to restrict file inclusion to predefined, trusted directories and ensure that all user-supplied parameters are properly escaped or encoded before being used in file operations. Additionally, the PHP configuration should be adjusted to disable remote file inclusion features entirely through the use of the allow_url_include directive set to off. Organizations should also implement web application firewalls that can detect and block suspicious patterns in HTTP requests that attempt to exploit such vulnerabilities, and conduct regular security assessments to identify and remediate similar issues across their application portfolios. The vulnerability serves as a historical example of why modern web development practices emphasize the principle of least privilege and the importance of validating all inputs regardless of their source.