CVE-2014-5528 in Appsflyer
Summary
by MITRE
The Appsflyer library 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 • 08/23/2024
The vulnerability identified as CVE-2014-5528 represents a critical security flaw in the AppsFlyer Android library that fundamentally compromises the integrity of secure communications between mobile applications and backend servers. This issue arises from the library's failure to properly validate SSL/TLS certificates during the connection establishment process, creating an exploitable gap in the cryptographic security framework that mobile applications rely upon for protecting sensitive user data and transactional information.
The technical root cause of this vulnerability lies in the improper implementation of certificate validation mechanisms within the AppsFlyer SDK. When an Android application integrates this library, it establishes secure connections to AppsFlyer's servers using SSL/TLS protocols. However, the library fails to perform proper X.509 certificate verification, which is a fundamental security requirement in cryptographic communications. This omission allows attackers to intercept communications using malicious certificates that appear legitimate to the vulnerable application, effectively bypassing the entire certificate validation infrastructure designed to prevent unauthorized access to sensitive data.
From an operational perspective, this vulnerability creates significant risk for organizations using the AppsFlyer library in their mobile applications. Attackers can exploit this weakness to perform man-in-the-middle attacks, where they position themselves between the mobile application and the intended server to intercept, modify, or steal sensitive information such as user credentials, personal data, financial transactions, and other confidential communications. The impact extends beyond individual user privacy concerns to potentially compromise entire application ecosystems and corporate data repositories that rely on the integrity of communications established through the vulnerable library.
The security implications of this vulnerability align with CWE-295, which specifically addresses "Improper Certificate Validation," and can be mapped to ATT&CK technique T1041, "Exfiltration Over C2 Channel," as attackers can use the compromised communication channels to exfiltrate sensitive data. Organizations utilizing the affected library face potential regulatory compliance violations under data protection frameworks such as GDPR, HIPAA, and PCI-DSS, as the vulnerability creates exploitable pathways for unauthorized data access and potential breaches.
Mitigation strategies for this vulnerability require immediate action from affected organizations, including updating to patched versions of the AppsFlyer SDK, implementing additional security monitoring for suspicious certificate validation behaviors, and conducting comprehensive security assessments of all mobile applications that utilize the library. Organizations should also consider implementing network-level security controls such as certificate pinning to provide additional protection layers beyond the standard SSL/TLS certificate validation mechanisms. The remediation process must include thorough testing to ensure that updated implementations maintain proper certificate validation while preserving application functionality and user experience.