CVE-2015-7369 in Adserver
Summary
by MITRE
The default Flash cross-domain policy (crossdomain.xml) in Revive Adserver before 3.2.2 does not restrict access cross domain access, which allows remote attackers to conduct cross domain attacks via unspecified vectors.
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Analysis
by VulDB Data Team • 06/21/2022
The vulnerability identified as CVE-2015-7369 represents a critical security flaw in Revive Adserver versions prior to 3.2.2, specifically concerning the handling of Flash cross-domain policy files. This issue stems from the improper configuration of the crossdomain.xml file, which serves as a crucial security mechanism for controlling cross-domain access in Flash-based web applications. The default policy configuration fails to adequately restrict access permissions, creating an exploitable gap in the application's security posture.
The technical flaw manifests in the absence of proper access controls within the crossdomain.xml policy file, which is designed to govern how Flash applications can communicate across different domains. When this file is improperly configured or lacks restrictive measures, it allows remote attackers to establish unauthorized cross-domain connections to the vulnerable Revive Adserver instance. This misconfiguration enables attackers to leverage Flash's cross-domain communication capabilities to bypass normal security boundaries and potentially access sensitive resources or data that should be restricted to specific domains.
The operational impact of this vulnerability extends beyond simple cross-domain access issues, as it provides attackers with a potential pathway for more sophisticated attacks. The unspecified vectors mentioned in the description suggest that the vulnerability could be exploited through various methods including but not limited to data exfiltration, session hijacking, or further exploitation of other vulnerabilities within the application. This weakness directly violates the fundamental security principle of least privilege and undermines the integrity of the application's network security controls.
The vulnerability aligns with CWE-284, which addresses improper access control in software applications, and demonstrates how inadequate security configuration can create exploitable conditions. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and lateral movement through network-based attacks. The cross-domain policy misconfiguration essentially creates an attack surface that allows adversaries to perform reconnaissance and potentially establish persistent access to the affected system. Organizations utilizing Revive Adserver versions before 3.2.2 face significant risk of unauthorized access and data compromise due to this misconfigured security control.
The recommended mitigation strategy involves updating to Revive Adserver version 3.2.2 or later, which includes the corrected cross-domain policy implementation. Additionally, system administrators should review and properly configure all cross-domain policy files to ensure they follow security best practices. The configuration should explicitly define which domains are permitted to access resources and implement appropriate restrictions to prevent unauthorized cross-domain communication. Regular security audits of Flash-based applications and their associated policy files should be conducted to maintain proper access controls and prevent similar misconfigurations from occurring in the future.