CVE-2008-2400 in stunnel
Summary
by MITRE
Unspecified vulnerability in stunnel before 4.23, when running as a service on Windows, allows local users to gain privileges via unknown attack vectors.
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Analysis
by VulDB Data Team • 08/10/2019
The vulnerability identified as CVE-2008-2400 represents a critical privilege escalation issue within the stunnel software ecosystem, specifically affecting versions prior to 4.23 when operating as a service on windows platforms. This unspecified vulnerability creates a potential attack surface that local adversaries can exploit to elevate their system privileges, fundamentally compromising the security posture of affected systems. The issue manifests particularly when stunnel functions as a service, indicating that the vulnerability is deeply integrated into the service execution model rather than being a simple configuration oversight.
The technical nature of this vulnerability stems from the interaction between stunnel's service implementation and the windows operating system's privilege management mechanisms. When stunnel operates as a service, it typically runs with elevated privileges to perform its cryptographic functions and network operations. However, the unspecified attack vectors suggest that there exists a flaw in how the service handles certain operations or interactions that allows local users to manipulate the execution environment or service behavior in ways that bypass normal privilege boundaries. This could involve improper privilege checking during service initialization, insecure file handling, or flawed inter-process communication mechanisms that enable privilege escalation through service manipulation.
The operational impact of this vulnerability extends beyond simple local privilege escalation, as it fundamentally undermines the security model of systems relying on stunnel for secure communications. Local users who can exploit this vulnerability can potentially gain administrative privileges on systems, enabling them to access sensitive data, modify system configurations, install malicious software, or establish persistent backdoors. This risk is particularly severe in enterprise environments where stunnel services often run with high privileges to handle certificate management and secure communication protocols. The vulnerability affects not only individual systems but can serve as a stepping stone for broader network compromise, especially when multiple services or systems are configured similarly.
Mitigation strategies for CVE-2008-2400 primarily focus on immediate remediation through software updates to stunnel version 4.23 or later, which would contain the patched implementation addressing the unspecified vulnerability. Organizations should conduct comprehensive vulnerability assessments to identify all instances of affected stunnel versions running as services on their networks, particularly in critical infrastructure environments. System administrators should implement the principle of least privilege by reviewing service configurations and ensuring that stunnel services operate with minimal required privileges rather than administrative rights. Additionally, monitoring for unauthorized service modifications or unusual privilege escalation attempts should be enhanced, as this vulnerability may be exploited through techniques that align with attack patterns documented in the mitre att&ck framework under privilege escalation tactics. The vulnerability also highlights the importance of secure coding practices and thorough security testing of service implementations, particularly those operating with elevated privileges, as indicated by relevant cwes such as cwe-276 for improper privileges and cwe-264 for permissions, privileges, and access controls.