CVE-2000-0459 in IMP
Summary
by MITRE
IMP does not remove files properly if the MSWordView application quits, which allows local users to cause a denial of service by filling up the disk space by requesting a large number of documents and prematurely stopping the request.
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Analysis
by VulDB Data Team • 04/21/2026
The vulnerability described in CVE-2000-0459 represents a critical file management flaw within the IMP (Internet Message Project) email client software that operates under Microsoft Windows environments. This issue specifically manifests when the MSWordView application component terminates unexpectedly or is prematurely closed during document processing operations. The root cause stems from improper file cleanup mechanisms within the application's resource management system, where temporary files and document processing artifacts are not properly deleted from the system's temporary storage directories. This flaw falls under the category of improper cleanup or resource deallocation vulnerabilities that can lead to significant system instability and resource exhaustion conditions.
The technical exploitation of this vulnerability occurs when a local attacker crafts multiple document requests that trigger the MSWordView application to process these files. As each document request is initiated, temporary files are created in the system's temporary directory space to facilitate the document viewing and processing operations. However, when the MSWordView application terminates prematurely or crashes during these operations, the cleanup routines that should normally remove these temporary files from disk storage are either bypassed or fail to execute completely. This results in a gradual accumulation of temporary files that consume available disk space, ultimately leading to a denial of service condition where the system becomes unable to process additional requests or store new data due to insufficient storage capacity.
The operational impact of this vulnerability extends beyond simple denial of service conditions to encompass broader system stability and performance degradation issues. Local users with minimal privileges can exploit this weakness to systematically fill up available disk space through repeated document requests, effectively rendering the system unusable for legitimate email operations and potentially affecting other system services that depend on adequate disk space availability. The vulnerability demonstrates characteristics consistent with CWE-119 Improper Access to Memory and CWE-129 Improper Validation of Input, as it involves improper handling of temporary file resources and inadequate validation of document processing operations. Attackers can leverage this flaw to perform persistent resource exhaustion attacks that may require system administrator intervention to resolve through manual cleanup of temporary files and system reboot operations.
Mitigation strategies for this vulnerability should focus on implementing proper file cleanup mechanisms within the IMP application, particularly during application termination events. System administrators should ensure that the MSWordView component is regularly updated with the latest security patches and that proper disk space monitoring is implemented to detect unusual file growth patterns. The implementation of automated cleanup routines that periodically scan and remove orphaned temporary files can help prevent accumulation of stale resources. Additionally, network security measures including access controls and monitoring of system resource utilization can help detect and prevent exploitation attempts. From an ATT&CK framework perspective, this vulnerability aligns with T1499.004 Endpoint Denial of Service and T1078 Valid Accounts, as it leverages local system resources and can be executed through legitimate user accounts to exhaust system resources. Organizations should also consider implementing system hardening practices that limit the amount of temporary storage available to applications and establish automated alerts when disk space utilization exceeds predetermined thresholds to prevent exploitation of this type of resource exhaustion vulnerability.