CVE-1999-1535 in AspUpload
Summary
by MITRE
Buffer overflow in AspUpload.dll in Persits Software AspUpload before 1.4.0.2 allows remote attackers to cause a denial of service, and possibly execute arbitrary commands, via a long argument in the HTTP request.
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Analysis
by VulDB Data Team • 04/19/2026
The vulnerability described in CVE-1999-1535 represents a critical buffer overflow flaw within the AspUpload.dll component of Persits Software's AspUpload ActiveX control. This issue affects versions prior to 1.4.0.2 and demonstrates a classic stack-based buffer overflow condition that occurs when processing HTTP request arguments. The vulnerability manifests when the software fails to properly validate the length of input parameters, specifically those passed as arguments in HTTP requests, leading to memory corruption that can be exploited by malicious actors.
The technical implementation of this buffer overflow stems from inadequate bounds checking within the AspUpload.dll library. When processing user-supplied input through HTTP requests, the component does not enforce proper input length limitations, allowing attackers to supply excessively long argument strings that exceed the allocated buffer space. This condition creates a situation where adjacent memory locations become overwritten, potentially corrupting program execution flow and enabling arbitrary code execution. The vulnerability falls under CWE-121, which specifically addresses stack-based buffer overflow conditions, and represents a fundamental flaw in input validation and memory management practices.
From an operational perspective, this vulnerability presents significant risks to web application security and system availability. Remote attackers can leverage this flaw to not only cause denial of service conditions through application crashes but also potentially execute arbitrary commands on the affected system with the privileges of the web server process. The impact extends beyond simple service disruption as the vulnerability could enable full system compromise if the web server has elevated privileges. This type of vulnerability aligns with ATT&CK technique T1203, which covers "Exploitation for Client Execution" and demonstrates how buffer overflow conditions can be weaponized for remote code execution.
The exploitation of this vulnerability typically involves crafting malicious HTTP requests containing oversized argument values that trigger the buffer overflow during request processing. Attackers may construct specially formatted payloads that not only cause the application to crash but also overwrite critical memory segments to redirect execution flow. The vulnerability's severity is compounded by the fact that it affects ActiveX controls commonly deployed in web environments, making it particularly dangerous in corporate and public web applications. Organizations running affected versions of Persits Software AspUpload should implement immediate mitigations including patching to version 1.4.0.2 or later, implementing input validation controls, and monitoring for suspicious HTTP request patterns that might indicate exploitation attempts.