CVE-2000-0740 in Net Tools PKI Server
Summary
by MITRE
Buffer overflow in strong.exe program in NAI Net Tools PKI server 1.0 before HotFix 3 allows remote attackers to execute arbitrary commands via a long URL in the HTTPS port.
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Analysis
by VulDB Data Team • 06/08/2025
The vulnerability identified as CVE-2000-0740 represents a critical buffer overflow flaw within the strong.exe component of NAI Net Tools PKI server version 1.0 prior to HotFix 3. This security weakness resides in the server's handling of HTTP requests transmitted over the HTTPS port, specifically when processing Uniform Resource Locators that exceed normal length parameters. The flaw stems from inadequate input validation mechanisms that fail to properly constrain the size of URL parameters received by the vulnerable application, creating an exploitable condition where maliciously crafted input can overwrite adjacent memory locations.
The technical implementation of this buffer overflow vulnerability occurs when the strong.exe program processes incoming HTTPS requests containing excessively long URLs. The program's memory management does not enforce proper bounds checking on the URL parameter length, allowing an attacker to supply input that exceeds the allocated buffer space. This overflow condition enables attackers to overwrite critical memory segments including return addresses and program control structures, potentially allowing arbitrary code execution with the privileges of the running process. The vulnerability is particularly dangerous because it operates over the HTTPS port, which typically requires authentication or operates in a trusted environment, making exploitation more plausible.
From an operational perspective, this vulnerability presents significant risks to organizations relying on NAI Net Tools PKI server implementations. Remote attackers can leverage this weakness to gain unauthorized access to the affected system, potentially escalating privileges to system level access. The impact extends beyond simple unauthorized access as the vulnerability allows for complete system compromise, enabling attackers to install backdoors, modify system files, or establish persistent access to the network infrastructure. The fact that the vulnerability operates over HTTPS port 443 makes it particularly attractive to attackers as they can exploit it without requiring special network access or physical presence at the target site.
Organizations should immediately implement mitigations including applying the available HotFix 3 patch from NAI to address the buffer overflow condition in the strong.exe program. Additionally, network segmentation and firewall rules should be configured to restrict access to the HTTPS port to only trusted sources. The implementation of intrusion detection systems capable of identifying malformed URL patterns and unusual traffic patterns on port 443 can provide additional layers of protection. From a compliance standpoint, this vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and represents a significant concern under ATT&CK technique T1059.007 for remote code execution through web services. System administrators should also consider implementing application whitelisting policies and regular security assessments to identify similar vulnerabilities in other network services and applications.