CVE-2000-0741 in Net Tools PKI Server
Summary
by MITRE
Format string vulnerability in strong.exe program in NAI Net Tools PKI server 1.0 before HotFix 3 allows remote attackers to execute arbitrary code via format strings in a URL with a .XUDA extension.
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Analysis
by VulDB Data Team • 06/08/2025
The vulnerability identified as CVE-2000-0741 represents a critical format string flaw in the strong.exe component of NAI Net Tools PKI server version 1.0 before HotFix 3. This vulnerability resides within the handling of web requests containing specific file extensions, particularly those with the .XUDA extension that are processed through the PKI server's web interface. The flaw stems from improper input validation and sanitization of user-supplied data that is subsequently used in format string operations without proper escaping or parameterization. Attackers can exploit this weakness by crafting malicious URLs that contain format specifiers such as %s, %d, or %x within the .XUDA extension parameters, allowing them to manipulate how the application processes and interprets user input.
The technical implementation of this vulnerability places the application at risk of arbitrary code execution through format string exploitation techniques that are well-documented within the cybersecurity community. When the strong.exe program processes a request containing malicious format specifiers in the URL parameter, it fails to properly validate or sanitize the input before passing it to functions that expect format strings. This creates opportunities for attackers to perform stack pointer manipulation, memory read/write operations, and potentially overwrite critical program memory locations. The vulnerability specifically affects the web server component of the PKI server that handles requests through the .XUDA extension, which typically represents a specific protocol or data format used by the NAI Net Tools suite for certificate management and related operations. The flaw aligns with CWE-134, which describes format string vulnerabilities where format strings are constructed from user-controlled data without proper validation.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete system compromise and potential data breaches within organizations relying on the affected PKI infrastructure. Attackers can leverage this vulnerability to gain unauthorized access to the underlying system, potentially escalating privileges to execute malicious payloads, modify certificate data, or disrupt certificate authority operations. The remote nature of the attack means that exploitation can occur from any location without requiring physical access to the server, making it particularly dangerous for production environments where PKI servers often serve as critical infrastructure components. Organizations using this version of NAI Net Tools PKI server face significant risk of unauthorized certificate issuance, certificate revocation manipulation, and overall compromise of their public key infrastructure. This vulnerability would likely be categorized under the ATT&CK technique T1059.007 for command and scripting interpreter, as attackers could potentially execute arbitrary commands on the compromised system through the format string exploitation.
Mitigation strategies for CVE-2000-0741 should prioritize immediate application of the vendor-provided HotFix 3 patch that addresses the format string vulnerability in the strong.exe component. Organizations should also implement network-level restrictions to limit access to the affected PKI server components, particularly those handling .XUDA extension requests, through firewall rules and access control lists. Additionally, input validation should be strengthened at all application layers to prevent format specifiers from being processed as part of user-supplied data, and logging should be enhanced to detect suspicious URL patterns and format string attempts. The vulnerability demonstrates the critical importance of proper input sanitization and parameter validation in web applications, particularly those handling sensitive cryptographic operations within PKI environments where trust and security are paramount. Security monitoring should include detection of malformed URL requests and unusual parameter patterns that could indicate exploitation attempts against similar format string vulnerabilities in other applications.