CVE-2014-5721 in Touchnote Postcards
Summary
by MITRE
The Touchnote Postcards (aka com.touchnote.android) application 4.2.7 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 • 08/30/2024
The vulnerability identified as CVE-2014-5721 affects the Touchnote Postcards Android application version 4.2.7, representing a critical security flaw in the application's SSL certificate validation mechanism. This weakness resides in the application's failure to properly verify X.509 certificates from SSL servers, creating a significant attack surface that adversaries can exploit to conduct man-in-the-middle attacks. The vulnerability directly impacts the application's ability to establish secure communications with backend servers, undermining the fundamental security principles of secure socket layer encryption that are essential for protecting sensitive user data during transmission.
From a technical perspective, the flaw manifests as a complete absence of certificate verification within the application's SSL implementation. This means that when the application establishes connections to remote servers using HTTPS or SSL protocols, it accepts any certificate presented by the server without performing the necessary validation checks that should confirm the certificate's authenticity, validity, and proper issuance chain. The vulnerability aligns with CWE-295, which specifically addresses "Improper Certificate Validation" and represents a classic example of insufficient certificate trust verification. The application essentially operates in a state where it trusts any certificate presented, regardless of whether it was issued by a legitimate certificate authority or if it has been compromised through malicious certificate generation.
The operational impact of this vulnerability extends beyond simple data interception, as it enables sophisticated attack scenarios that can compromise user privacy and data integrity. An attacker positioned in the network path between the Android device and the server can present a forged certificate that appears legitimate to the vulnerable application, allowing them to decrypt and modify communications between the user and the server. This capability enables attackers to obtain sensitive information such as user credentials, personal data, payment information, and other confidential communications that should remain protected during transmission. The vulnerability creates a persistent threat vector that can be exploited across multiple sessions and connections, making it particularly dangerous for applications handling sensitive user information.
Security professionals should recognize this vulnerability as a prime example of how mobile applications can be compromised through inadequate cryptographic implementation, falling into the ATT&CK framework category of T1552.2 (Credentials from Password Stores) and T1041 (Exfiltration Over C2 Channel) when exploited. The vulnerability's impact is amplified by the fact that it affects a mobile application, where users may be connecting to servers from various network environments including public Wi-Fi networks where man-in-the-middle attacks are more prevalent. Organizations should implement immediate mitigations including updating the application to a version that properly implements certificate verification, implementing network-level security controls such as certificate pinning, and conducting thorough security assessments of all mobile applications that handle sensitive data. Additionally, this vulnerability underscores the importance of following secure coding practices and adhering to industry standards such as those outlined in the OWASP Mobile Security Project, which specifically addresses the need for proper certificate validation in mobile applications to prevent such critical security flaws from being introduced into production software.