CVE-2015-8482 in Unified Agent
Summary
by MITRE
Blue Coat Unified Agent before 4.6.2 does not prevent modification of its configuration files when running in local enforcement mode, which allows local administrators to unblock categories or disable the agent via unspecified vectors.
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Analysis
by VulDB Data Team • 04/27/2018
The vulnerability identified as CVE-2015-8482 affects Blue Coat Unified Agent versions prior to 4.6.2, specifically when operating in local enforcement mode. This represents a critical security flaw that undermines the integrity of the agent's configuration management system. The issue stems from insufficient access controls and validation mechanisms within the agent's file handling processes, allowing unauthorized local administrators to manipulate core configuration parameters without proper authorization. The vulnerability exists at the file system level where the agent fails to implement proper file permissions or integrity checks on its configuration files, creating a pathway for privilege escalation and policy bypass.
From a technical perspective, the flaw manifests as a lack of proper input validation and access control enforcement within the Blue Coat Unified Agent's local enforcement framework. When the agent operates in local enforcement mode, it should maintain strict control over its configuration files to prevent unauthorized modifications that could compromise security policies. However, the implementation fails to properly validate file access requests or implement proper file locking mechanisms, allowing local administrators to modify critical configuration parameters. This vulnerability aligns with CWE-276, which addresses improper file permissions, and CWE-732, which covers inadequate permissions for critical resources. The unspecified vectors mentioned in the description suggest that multiple modification paths exist, potentially including direct file system manipulation, configuration interface manipulation, or process injection techniques that exploit the agent's trust model.
The operational impact of this vulnerability is significant for organizations relying on Blue Coat Unified Agent for network security enforcement. Local administrators with access to the system can bypass security policies by unblocking previously restricted content categories or disabling the agent entirely, effectively nullifying the security controls that the agent is designed to enforce. This creates a scenario where internal threats or compromised accounts can undermine the organization's security posture by modifying the agent's behavior. The vulnerability essentially allows for a complete bypass of the agent's intended security functions, potentially enabling data exfiltration, unauthorized access to restricted resources, or the establishment of persistent backdoors. Organizations may experience compliance violations and security breaches when this vulnerability is exploited, as the security controls that should be protecting against such threats are rendered ineffective.
Mitigation strategies for this vulnerability should focus on immediate patching to version 4.6.2 or later, which addresses the configuration file protection mechanisms. Organizations should also implement additional monitoring and auditing of configuration file changes, particularly focusing on the Blue Coat Unified Agent directories and their associated file permissions. Network segmentation and principle of least privilege should be enforced to limit local administrative access to systems running the agent. Security teams should conduct thorough vulnerability assessments to identify all instances of the affected software and ensure proper configuration file permissions are implemented. The remediation process should include verification that the agent properly enforces access controls and that configuration files cannot be modified without proper authorization. This vulnerability demonstrates the importance of proper privilege separation and access control implementation, as highlighted by ATT&CK technique T1068, which covers privilege escalation through local administration access. Organizations should also consider implementing integrity checking mechanisms and file monitoring solutions to detect unauthorized modifications to critical security agent configuration files.