CVE-2015-1454 in ProxyClient
Summary
by MITRE
Blue Coat ProxyClient before 3.3.3.3 and 3.4.x before 3.4.4.10 and Unified Agent before 4.1.3.151952 does not properly validate certain certificates, which allows man-in-the-middle attackers to spoof ProxySG Client Managers, and consequently modify configurations and execute arbitrary software updates, via a crafted certificate.
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Analysis
by VulDB Data Team • 04/12/2022
The vulnerability identified as CVE-2015-1454 represents a critical certificate validation flaw in Blue Coat ProxyClient software and Unified Agent implementations. This weakness affects multiple versions of the software including ProxyClient versions prior to 3.3.3.3 and 3.4.x versions before 3.4.4.10, as well as Unified Agent versions before 4.1.3.151952. The vulnerability stems from insufficient certificate validation mechanisms that fail to properly verify the authenticity and integrity of digital certificates used in the communication between client systems and ProxySG Client Managers. This flaw creates a significant security gap that enables malicious actors to perform man-in-the-middle attacks against authenticated sessions.
The technical implementation of this vulnerability lies in the improper certificate validation process where the affected software components do not adequately verify certificate chains, trust anchors, or cryptographic signatures. Attackers can exploit this weakness by presenting crafted certificates that appear to be legitimate ProxySG Client Manager certificates, thereby bypassing the normal authentication procedures. This allows unauthorized individuals to establish fraudulent connections with the client systems and gain administrative privileges over the configuration management functions. The vulnerability specifically targets the certificate validation routines that should ensure only trusted certificates are accepted for authentication purposes.
The operational impact of CVE-2015-1454 is severe and multifaceted, as it provides attackers with the ability to completely compromise the integrity of ProxySG client management systems. Once successfully exploited, adversaries can modify critical configuration settings, inject malicious code, and perform arbitrary software updates that can persist across system reboots. This capability enables attackers to maintain long-term access to compromised systems while potentially establishing backdoors or exfiltrating sensitive data. The vulnerability essentially grants remote attackers the same privileges as legitimate administrators, making it particularly dangerous in enterprise environments where ProxySG appliances are commonly deployed for web filtering and security policy enforcement.
Organizations affected by this vulnerability should immediately implement mitigation strategies including updating to the patched versions of ProxyClient and Unified Agent software, implementing additional network monitoring to detect anomalous certificate usage patterns, and reviewing existing certificate trust configurations. Security teams should also consider deploying network segmentation measures to limit the potential attack surface and implement certificate pinning mechanisms where possible. From a compliance perspective, this vulnerability aligns with CWE-295 which addresses improper certificate validation, and represents a significant concern under ATT&CK framework category T1059 for execution through legitimate system processes. The vulnerability demonstrates the critical importance of proper certificate validation in maintaining secure communications and highlights the need for robust cryptographic practices in enterprise security infrastructure deployments.