CVE-2021-20732 in App
Summary
by MITRE • 06/09/2021
The ATOM (ATOM - Smart life App for Android versions prior to 1.8.1 and ATOM - Smart life App for iOS versions prior to 1.8.2) does not verify server certificate properly, which allows man-in-the-middle attackers to eavesdrop on encrypted communication via a crafted certificate.
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Analysis
by VulDB Data Team • 06/11/2021
The vulnerability identified as CVE-2021-20732 affects the ATOM smart home application across both android and ios platforms, specifically targeting versions prior to 1.8.1 for android and 1.8.2 for ios. This represents a critical flaw in the application's cryptographic implementation that undermines the fundamental security assurances of encrypted communications. The vulnerability stems from improper server certificate verification mechanisms within the application's secure communication stack, creating an exploitable weakness that directly violates established security protocols for mobile application development and network communication.
The technical flaw manifests as a failure in the certificate pinning or validation process that should occur during the establishment of secure connections between the mobile application and its backend services. When an application fails to properly validate server certificates, it essentially removes the cryptographic trust verification that ensures communications are genuinely secured between the client and the intended server. This weakness allows attackers to perform man-in-the-middle attacks by presenting forged certificates that appear legitimate to the vulnerable application, thereby enabling them to intercept, modify, or steal sensitive data transmitted through the encrypted channels.
The operational impact of this vulnerability extends beyond simple data interception to encompass potential compromise of user privacy and device security within smart home environments. Mobile applications that control smart home devices often transmit sensitive information including user credentials, device configuration details, and personal lifestyle data. When attackers can successfully perform man-in-the-middle attacks, they gain access to these communications, potentially allowing them to control connected devices, access personal information, or establish persistent access points within users' home networks. This vulnerability directly maps to attack techniques categorized under the MITRE ATT&CK framework within the credential access and defense evasion domains, as it enables attackers to obtain valid credentials and avoid detection through legitimate communication channels.
The security implications of this vulnerability align with CWE-295, which specifically addresses "Improper Certificate Validation," representing a well-documented weakness in cryptographic implementations that affects mobile applications and network services. Organizations implementing security controls should consider this vulnerability in their risk assessment frameworks, particularly when evaluating the security posture of IoT and smart home ecosystems. The affected applications must implement proper certificate validation mechanisms including certificate pinning, robust certificate chain validation, and proper trust store management to prevent exploitation. Additionally, the vulnerability demonstrates the critical importance of maintaining up-to-date security practices in mobile applications and highlights the necessity of comprehensive security testing including penetration testing and secure coding reviews to identify similar implementation flaws before they can be exploited in real-world scenarios.