CVE-2002-0627 in Viewstation
Summary
by MITRE
The Web server for Polycom ViewStation before 7.2.4 allows remote attackers to bypass authentication and read files via Unicode encoded requests.
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Analysis
by VulDB Data Team • 05/09/2019
The CVE-2002-0627 vulnerability affects the Polycom ViewStation web server software version 7.2.3 and earlier, representing a critical authentication bypass flaw that enables remote attackers to access restricted files through specially crafted Unicode encoded HTTP requests. This vulnerability stems from insufficient input validation within the web server's request processing mechanism, specifically when handling Unicode characters in the URL path or parameters. The flaw allows malicious actors to construct requests that exploit character encoding inconsistencies in the authentication validation process, effectively circumventing the server's access control mechanisms. Attackers can leverage this vulnerability to retrieve sensitive configuration files, system information, and potentially confidential data without proper authorization, making it a significant security risk for organizations relying on Polycom ViewStation devices for video conferencing and collaboration services.
The technical implementation of this vulnerability involves the web server's failure to properly normalize or validate Unicode characters during the authentication check process. When a request containing Unicode encoded sequences is processed, the server's authentication module may interpret these sequences differently than intended, allowing unauthorized access to protected resources. This issue falls under the CWE-129 weakness category, which encompasses improper validation of input that can lead to various authentication bypass scenarios. The vulnerability demonstrates a classic example of encoding-based attacks where the distinction between different character encodings creates an exploitable gap in the security model. The Unicode handling flaw specifically relates to how the server processes multibyte character sequences in URLs, where certain Unicode characters may be interpreted as equivalent to ASCII characters in the authentication context, thereby undermining the security controls.
The operational impact of CVE-2002-0627 extends beyond simple unauthorized file access, potentially enabling attackers to gain comprehensive insights into the network infrastructure and system configuration of affected devices. Remote attackers can exploit this vulnerability from any location with network access to the Polycom ViewStation, making it particularly dangerous for organizations with remote workers or distributed networks. The ability to bypass authentication without requiring valid credentials significantly increases the attack surface and reduces the effectiveness of traditional security controls. This vulnerability directly impacts the confidentiality and integrity of the system, as unauthorized parties can access sensitive data and potentially modify system configurations. Organizations using these devices may experience service disruption, data breaches, and compliance violations, especially in regulated environments where unauthorized access to system information is strictly prohibited.
Mitigation strategies for CVE-2002-0627 primarily involve updating the Polycom ViewStation firmware to version 7.2.4 or later, which includes proper Unicode handling and authentication validation mechanisms. Network administrators should implement immediate patch management procedures to upgrade all affected devices and verify that the update has been successfully applied. Additionally, organizations should consider implementing network segmentation and access controls to limit exposure of these devices to untrusted networks. The vulnerability highlights the importance of proper input validation and encoding normalization in web applications, aligning with ATT&CK technique T1190 for exploiting vulnerabilities in web applications. Security monitoring should include detection of unusual Unicode character sequences in HTTP requests, and organizations should establish incident response procedures to address potential exploitation attempts. Regular security assessments and penetration testing should be conducted to identify similar encoding-based vulnerabilities in other networked devices and applications within the organization's infrastructure.