CVE-2010-3900 in Midori
Summary
by MITRE
Midori before 0.2.5, when WebKitGTK+ before 1.1.14 or LibSoup before 2.29.91 is used, does not verify X.509 certificates, which allows man-in-the-middle attackers to spoof arbitrary https web sites via a crafted server certificate, a related issue to CVE-2010-3312.
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Analysis
by VulDB Data Team • 05/26/2025
The vulnerability identified as CVE-2010-3900 represents a critical security flaw in the Midori web browser version 0.2.4 and earlier, which operated on Linux systems. This issue specifically affected configurations where Midori utilized WebKitGTK+ versions prior to 1.1.14 or LibSoup versions before 2.29.91. The core problem lies in the browser's complete absence of X.509 certificate verification during HTTPS connections, creating a fundamental security gap that undermines the entire public key infrastructure that secures web communications.
The technical flaw manifests as a failure in the certificate validation process that should normally occur when establishing secure HTTPS connections. When a web browser connects to a secure website, it must verify that the server's SSL/TLS certificate is valid and issued by a trusted certificate authority. This process involves checking certificate signatures, expiration dates, and ensuring the certificate matches the domain being accessed. In Midori's case, this verification step was entirely bypassed, allowing attackers to present any certificate without validation. The vulnerability operates at the transport layer security level, specifically affecting the TLS/SSL handshake process where certificate validation should occur.
This security weakness enables sophisticated man-in-the-middle attacks where malicious actors can intercept communications between users and legitimate websites. Attackers can create fraudulent certificates that appear to be from trusted domains, allowing them to decrypt and modify traffic between users and web servers. The impact extends beyond simple eavesdropping to include potential data manipulation, credential theft, and complete session hijacking. Users connecting to sites such as online banking portals, email services, or corporate intranets would be particularly vulnerable to these attacks, as the browser would accept any certificate without question, making it impossible to distinguish between legitimate and malicious connections.
The vulnerability's relationship to CVE-2010-3312 demonstrates a pattern of security flaws in web browser implementations where certificate validation was either disabled or improperly implemented. This type of flaw aligns with CWE-295, which specifically addresses "Improper Certificate Validation," and represents a critical weakness in the authentication and integrity verification mechanisms. From an operational perspective, this vulnerability could be exploited through various attack vectors including compromised networks, rogue access points, or compromised DNS servers, making it particularly dangerous in enterprise environments where network security may be less robust.
Organizations and users should immediately upgrade to Midori version 0.2.5 or later, which includes proper certificate validation mechanisms. System administrators should also ensure that underlying dependencies such as WebKitGTK+ and LibSoup are updated to versions that properly implement certificate verification. Network monitoring solutions should be configured to detect unusual certificate behavior, and users should be educated about the importance of verifying SSL/TLS certificate warnings. The remediation process should include comprehensive testing to ensure that certificate validation works correctly across all supported platforms and configurations, as improper implementation of certificate validation can lead to denial of service conditions or legitimate certificate rejection.