CVE-2001-0241 in Windows
Summary
by MITRE
Buffer overflow in Internet Printing ISAPI extension in Windows 2000 allows remote attackers to gain root privileges via a long print request that is passed to the extension through IIS 5.0.
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Analysis
by VulDB Data Team • 10/07/2025
The vulnerability described in CVE-2001-0241 represents a critical buffer overflow flaw within the Internet Printing ISAPI extension component of Microsoft Windows 2000 systems running IIS 5.0. This issue stems from improper input validation mechanisms within the print request processing functionality, creating a pathway for remote exploitation that can result in complete system compromise. The vulnerability specifically affects the handling of print requests passed through the Internet Printing Protocol, which is commonly used for remote printing services in enterprise environments. When a maliciously crafted print request exceeds the allocated buffer space, the overflow can overwrite adjacent memory locations, potentially allowing attackers to execute arbitrary code with the highest privileges available on the system.
The technical implementation of this vulnerability falls under CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows data to be written beyond the allocated memory buffer. The flaw occurs in the ISAPI extension's print request processing logic, where incoming data from IIS 5.0 is not properly validated against maximum length constraints before being copied into fixed-size buffers. This type of vulnerability is particularly dangerous because it operates at the system level within the context of IIS, which typically runs with elevated privileges. The attack vector involves sending a specially crafted print request to the target system, which then triggers the buffer overflow during processing, potentially leading to privilege escalation from standard user access to root or administrator level access.
From an operational perspective, this vulnerability presents significant risk to organizations running Windows 2000 servers with IIS 5.0 and the Internet Printing extension enabled. The remote nature of the attack means that exploitation can occur without requiring local system access or physical presence, making it particularly attractive to attackers seeking to compromise systems remotely. The impact extends beyond simple privilege escalation as the successful exploitation can lead to complete system takeover, allowing attackers to install malware, establish backdoors, steal sensitive data, or use the compromised system as a launching point for further attacks within the network. Organizations with multiple Windows 2000 servers running IIS 5.0 are particularly vulnerable, as this represents a widespread attack surface that can be exploited across entire server farms.
The mitigation strategies for CVE-2001-0241 primarily focus on immediate patching and configuration hardening measures. Microsoft released security updates addressing this vulnerability through their regular security bulletin process, and organizations should prioritize applying these patches to all affected systems. Additionally, network-level protections such as firewall rules can be implemented to restrict access to the Internet Printing service ports, specifically port 9100 which is commonly used for printer communication. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically targeting the use of software exploitation to gain elevated system privileges. Organizations should also implement monitoring solutions to detect unusual print request patterns that might indicate exploitation attempts, while considering the removal of unnecessary print services from production systems. The vulnerability demonstrates the importance of input validation and memory safety practices in server-side applications, highlighting the critical need for secure coding practices that prevent buffer overflows and other memory corruption vulnerabilities.