CVE-2014-7724 in Blink
Summary
by MITRE
The Chemssou Blink (aka com.chemssou.blink) application 1.0 for Android does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.
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Analysis
by VulDB Data Team • 10/16/2024
The Chemssou Blink application version 1.0 for Android presents a critical security vulnerability through its improper handling of SSL/TLS certificate validation mechanisms. This flaw resides in the application's failure to properly verify X.509 certificates presented by SSL servers during secure communications. The vulnerability creates a dangerous trust relationship where the application accepts any certificate without cryptographic verification, effectively disabling the fundamental security assurances that SSL/TLS protocols are designed to provide. This weakness allows malicious actors to perform man-in-the-middle attacks by presenting forged certificates that appear legitimate to the vulnerable application, thereby undermining the confidentiality and integrity of data transmitted between the mobile device and remote servers.
The technical implementation flaw stems from the application's inadequate SSL certificate validation logic within its network communication stack. When establishing secure connections, the application should validate certificate chains against trusted root authorities using proper certificate pinning or trust store verification mechanisms. However, this implementation fails to perform essential certificate checks including signature validation, expiration date verification, and chain of trust establishment. The vulnerability aligns with CWE-295, which specifically addresses "Improper Certificate Validation," and represents a classic example of weak cryptographic implementation that violates fundamental security principles. This weakness creates an attack surface where adversaries can exploit the trust relationship to intercept, modify, or redirect communications without detection.
The operational impact of this vulnerability extends beyond simple data interception to encompass comprehensive security compromise of user data and application integrity. Mobile applications that fail to properly validate SSL certificates become vulnerable to various attack vectors including credential theft, session hijacking, and data manipulation. Users of the Chemssou Blink application face significant risks when connecting to sensitive services, as attackers can impersonate legitimate servers and capture authentication credentials, personal information, or financial data. The vulnerability particularly affects applications that handle sensitive user data, making it a prime target for cybercriminals seeking to exploit mobile application security weaknesses. This flaw demonstrates a fundamental failure in mobile application security development practices and represents a violation of industry standards for secure mobile application design.
Mitigation strategies for this vulnerability require immediate implementation of proper SSL certificate validation mechanisms within the application. Developers should implement certificate pinning to ensure that only specific certificates or certificate authorities are accepted, thereby preventing attackers from using forged certificates. The application must validate certificate chains against trusted root certificates, verify certificate expiration dates, and ensure proper signature validation. Security measures should include implementing proper trust store management and utilizing established cryptographic libraries that handle certificate validation correctly. Organizations should also consider implementing network monitoring to detect potential man-in-the-middle attacks and establish secure communication protocols that align with NIST SP 800-52 recommendations for mobile application security. The fix requires comprehensive code review and security testing to ensure that all network communication paths properly validate SSL/TLS certificates, addressing the underlying CWE-295 weakness through proper cryptographic implementation.