CVE-2008-2528 in Access Gateway
Summary
by MITRE
Unspecified vulnerability in Citrix Access Gateway Standard Edition 4.5.7 and earlier and Advanced Edition 4.5 HF2 and earlier allows attackers to bypass authentication and gain "access to network resources" via unspecified vectors.
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Analysis
by VulDB Data Team • 03/16/2021
The vulnerability identified as CVE-2008-2528 represents a critical authentication bypass flaw affecting Citrix Access Gateway products across both Standard and Advanced editions. This weakness exists in versions 4.5.7 and earlier for Standard Edition, and 4.5 HF2 and earlier for Advanced Edition, creating a significant security risk for organizations relying on these access gateway solutions for network resource protection. The unspecified nature of the attack vectors suggests multiple potential pathways through which an attacker could exploit this vulnerability, making it particularly concerning for security professionals who must account for various attack surfaces.
The technical flaw underlying CVE-2008-2528 stems from inadequate authentication mechanisms within the Citrix Access Gateway implementation, allowing unauthorized users to circumvent the normal access control procedures that should govern network resource access. This authentication bypass capability directly violates fundamental security principles and creates a pathway for malicious actors to gain unauthorized network access without proper credentials or authorization. The vulnerability essentially undermines the core purpose of the access gateway as a security control, transforming it from a protective barrier into a potential entry point for attackers.
From an operational impact perspective, this vulnerability presents a severe threat to enterprise network security infrastructure, as successful exploitation would enable attackers to access sensitive network resources that should remain protected behind the Citrix Access Gateway. Organizations using these vulnerable versions face potential data breaches, unauthorized system access, and compromise of critical network assets. The risk is amplified when considering that Citrix Access Gateway products are commonly deployed in enterprise environments where they serve as primary gateways for remote access to internal networks, making them attractive targets for cybercriminals seeking persistent access to organizational resources.
Security professionals should note that this vulnerability aligns with CWE-287, which addresses improper authentication issues in software systems, and represents a classic example of how authentication flaws can undermine entire security architectures. The ATT&CK framework categorizes this type of vulnerability under privilege escalation and initial access tactics, as it enables adversaries to bypass authentication mechanisms and establish unauthorized access to network resources. Organizations should implement immediate mitigation strategies including applying the vendor-provided patches, conducting comprehensive network segmentation, and monitoring for suspicious authentication attempts or unauthorized access patterns.
The remediation approach for CVE-2008-2528 requires organizations to upgrade their Citrix Access Gateway installations to versions that address this authentication bypass vulnerability. Security teams should also implement additional protective measures such as network access control policies, enhanced monitoring of authentication events, and regular security assessments of their access gateway configurations. Given the age of this vulnerability and its widespread impact, organizations should consider comprehensive security audits of their remote access infrastructure to identify and remediate similar authentication weaknesses that may exist in other network security components.