CVE-2017-18227 in WebTitan Gateway
Summary
by MITRE
TitanHQ WebTitan Gateway has incorrect certificate validation for the TLS interception feature.
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Analysis
by VulDB Data Team • 01/12/2020
The TitanHQ WebTitan Gateway represents a security appliance designed to provide web filtering and content control services for enterprise networks. This device operates as a transparent proxy that intercepts and inspects HTTPS traffic between client endpoints and web servers. The appliance implements TLS interception capabilities to examine encrypted web traffic for security policy enforcement, malware detection, and content filtering purposes. The vulnerability CVE-2017-18227 specifically targets the certificate validation mechanisms within this TLS interception feature, creating a critical security weakness that undermines the integrity of the encryption protection.
The technical flaw manifests in the improper validation of SSL/TLS certificates during the interception process. When the WebTitan Gateway intercepts HTTPS traffic, it generates and presents its own certificate to client devices while maintaining a connection to the original web server. The vulnerability stems from insufficient certificate verification procedures that fail to properly validate the authenticity and trustworthiness of certificates presented during the interception process. This weakness allows for potential man-in-the-middle attacks where malicious actors could exploit the flawed validation to present fraudulent certificates that would be accepted by the appliance, thereby compromising the encrypted communication channel.
The operational impact of this vulnerability extends beyond simple certificate validation failures to encompass broader security implications for organizations relying on the WebTitan Gateway. Attackers exploiting this vulnerability could potentially establish unauthorized interception points within the network, allowing them to decrypt and monitor sensitive communications that were previously protected by TLS encryption. This compromises the confidentiality of business data, personal information, and proprietary communications flowing through the network. The vulnerability particularly affects organizations that depend on the appliance for web filtering while maintaining strict security policies around encrypted traffic inspection, as it fundamentally undermines the trust model that the security appliance is designed to enforce.
Organizations should implement immediate mitigations including updating to patched versions of the WebTitan Gateway software, reviewing and strengthening certificate management policies, and implementing additional network monitoring to detect unauthorized interception attempts. The vulnerability aligns with CWE-295 which addresses improper certificate validation and relates to ATT&CK technique T1566 which covers credential harvesting through phishing and social engineering. Network administrators should also consider implementing certificate pinning mechanisms where appropriate, establishing strict certificate authority validation procedures, and conducting regular security assessments of interception points within the network infrastructure to prevent exploitation of similar validation weaknesses.