CVE-2011-4092 in obby
Summary
by MITRE
obby (aka libobby) does not verify SSL server certificates, which allows remote attackers to spoof servers via an arbitrary certificate.
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Analysis
by VulDB Data Team • 03/17/2019
The vulnerability identified as CVE-2011-4092 affects the obby library also known as libobby, which is a library used for implementing lobby functionality in multiplayer games. This flaw represents a critical security weakness in the library's handling of secure communications. The vulnerability stems from the library's failure to properly validate SSL/TLS server certificates during the connection establishment process, creating a significant attack surface that can be exploited by malicious actors.
This technical flaw specifically resides in the SSL certificate verification mechanism within the libobby library implementation. When applications utilize this library for establishing secure connections to game servers, the library does not perform proper certificate validation checks that should confirm the authenticity of the server's SSL certificate. The absence of certificate verification allows attackers to intercept communications and present arbitrary certificates to establish fake server connections, effectively enabling man-in-the-middle attacks. This vulnerability directly maps to CWE-295, which addresses improper certificate validation, and aligns with ATT&CK technique T1573.002 related to secure channel protocols.
The operational impact of this vulnerability is substantial as it undermines the fundamental security assumptions of encrypted communications within gaming applications. Attackers can exploit this weakness to impersonate legitimate game servers, potentially redirecting players to malicious infrastructure, stealing login credentials, or injecting malicious game data. The vulnerability affects any application that relies on libobby for secure lobby communications, particularly multiplayer games that depend on authenticated server connections. This creates a persistent threat vector where adversaries can maintain long-term access to game networks without detection, as the lack of certificate verification makes it difficult for legitimate users to distinguish between authentic and malicious servers.
Mitigation strategies for this vulnerability require immediate attention from developers and system administrators. The primary solution involves implementing proper SSL certificate validation within the libobby library by ensuring that all certificate verification checks are performed before establishing secure connections. This includes validating certificate chains, checking certificate expiration dates, and verifying certificate signatures against trusted certificate authorities. Organizations should also consider implementing additional security measures such as certificate pinning to prevent the use of arbitrary certificates, even when they are technically valid. The vulnerability highlights the importance of adhering to security best practices outlined in industry standards such as NIST SP 800-52 for certificate management and the OWASP Top Ten security guidelines for secure communications. Regular security audits and penetration testing should be conducted to ensure that all cryptographic libraries properly implement certificate validation mechanisms.