CVE-2007-5965 in QSslSocket
Summary
by MITRE
QSslSocket in Trolltech Qt 4.3.0 through 4.3.2 does not properly verify SSL certificates, which might make it easier for remote attackers to trick a user into accepting an invalid server certificate for a spoofed service, or trick a service into accepting an invalid client certificate for a user.
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Analysis
by VulDB Data Team • 08/02/2019
The vulnerability identified as CVE-2007-5965 affects the QSslSocket component within Trolltech Qt framework versions 4.3.0 through 4.3.2, representing a critical weakness in SSL/TLS certificate validation mechanisms. This flaw resides in the core cryptographic library implementation that governs secure socket communications, specifically undermining the fundamental trust model that SSL/TLS protocols are designed to establish between communicating parties. The vulnerability stems from insufficient certificate verification procedures that fail to properly validate the authenticity and legitimacy of digital certificates presented during secure connections.
The technical implementation flaw manifests in the QSslSocket class's inability to correctly perform certificate chain validation and hostname matching operations that are essential for establishing secure communications. This weakness allows attackers to exploit the certificate validation process by presenting forged certificates that would normally be rejected by proper SSL validation routines. The vulnerability creates a scenario where both client and server certificate validation can be bypassed, enabling man-in-the-middle attacks where attackers can intercept and manipulate communications between legitimate parties. The flaw specifically impacts the certificate verification algorithms that should ensure certificate validity, issuer authenticity, and proper hostname alignment between the certificate and the service being accessed.
Operationally, this vulnerability presents significant risks to applications built using the affected Qt versions, as it undermines the security assurances that SSL/TLS encryption is meant to provide. Attackers can exploit this weakness to perform credential theft, data interception, and service impersonation attacks without detection. The impact extends beyond simple data compromise to include potential authentication bypass scenarios where users might unknowingly trust malicious certificates presented by attackers. Systems relying on Qt applications for secure communications, including web browsers, network clients, and server applications, become vulnerable to sophisticated attack vectors that leverage the improper certificate validation.
Organizations should implement immediate mitigations including upgrading to Qt versions 4.3.3 or later where this vulnerability has been resolved through enhanced certificate validation procedures. The fix addresses the core issue by implementing proper certificate chain validation and hostname verification mechanisms that align with industry standards for secure communications. Additional defensive measures include monitoring network traffic for suspicious certificate patterns, implementing certificate pinning strategies where applicable, and conducting thorough security assessments of Qt-based applications to identify potential exposure. This vulnerability aligns with CWE-295 which specifically addresses improper certificate validation and relates to ATT&CK technique T1573.001 concerning secure protocol violations, emphasizing the critical importance of proper cryptographic implementation in preventing security breaches.