CVE-2018-4015 in BrightCloud SDK
Summary
by MITRE
An exploitable vulnerability exists in the HTTP client functionality of the Webroot BrightCloud SDK. The configuration of the HTTP client does not enforce a secure connection by default, resulting in a failure to validate TLS certificates. An attacker could impersonate a remote BrightCloud server to exploit this vulnerability.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 04/26/2020
The vulnerability identified as CVE-2018-4015 resides within the Webroot BrightCloud SDK's HTTP client implementation, representing a critical security flaw that undermines the integrity of secure communications. This issue manifests in the default configuration of the HTTP client which fails to enforce mandatory secure connections, creating a pathway for man-in-the-middle attacks. The vulnerability stems from insufficient TLS certificate validation mechanisms that should normally verify the authenticity of remote servers before establishing encrypted connections. According to CWE-295, this represents a weakness in certificate validation where the system fails to properly validate the trustworthiness of TLS certificates, making it susceptible to cryptographic attacks that compromise secure communication channels.
The technical exploitation of this vulnerability occurs when an attacker positions themselves between the client application and the BrightCloud server, intercepting and modifying network traffic. The HTTP client's default behavior allows connections to proceed even when TLS certificate validation fails, effectively disabling the security guarantees that encryption protocols are designed to provide. This flaw enables attackers to create fake server responses that appear legitimate to the client application, facilitating unauthorized data access, modification, or interception. The vulnerability specifically impacts the secure transmission of sensitive information through the SDK, potentially exposing user data, authentication tokens, or other confidential communications that should remain protected during transit.
The operational impact of CVE-2018-4015 extends beyond simple data interception, as it fundamentally compromises the trust model that secure applications rely upon for maintaining data integrity and confidentiality. Applications using the Webroot BrightCloud SDK become vulnerable to various attack vectors including credential theft, data manipulation, and privacy violations. The vulnerability affects any system that depends on the BrightCloud SDK for secure communications, potentially exposing organizations to regulatory compliance violations and reputational damage. Attackers can leverage this weakness to perform session hijacking, execute arbitrary code, or gain unauthorized access to systems that rely on the SDK for secure network communications. This vulnerability aligns with ATT&CK technique T1046 which describes network service scanning and exploitation of insecure communication protocols.
Mitigation strategies for CVE-2018-4015 require immediate implementation of proper TLS certificate validation controls within the HTTP client configuration. Organizations should ensure that all HTTP client instances enforce mandatory certificate validation with proper trust chain verification, including certificate pinning where appropriate for critical applications. The recommended approach involves configuring the SDK to reject connections when certificate validation fails, implementing strict hostname verification, and establishing proper certificate revocation checking mechanisms. Security teams should also consider implementing network monitoring to detect potential exploitation attempts and establish proper incident response procedures for handling potential compromise scenarios. Additionally, application developers must review all network communication code to ensure that secure connection parameters are properly configured and that default insecure settings are not inadvertently used in production environments. The fix should align with industry best practices for secure coding and TLS implementation as outlined in NIST SP 800-52 and OWASP secure coding guidelines.