CVE-2018-8056 in Bridge Cobub Razor
Summary
by MITRE
Physical path Leakage exists in Western Bridge Cobub Razor 0.8.0 via an invalid channel_name parameter to /index.php?/manage/channel/addchannel or a direct request to /export.php.
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Analysis
by VulDB Data Team • 04/05/2025
The vulnerability CVE-2018-8056 represents a critical information disclosure flaw in Western Bridge Cobub Razor version 0.8.0 that exposes physical file paths through improper error handling mechanisms. This vulnerability specifically manifests when an attacker submits an invalid channel_name parameter to the management endpoint at /index.php?/manage/channel/addchannel or directly accesses the export.php script without proper validation. The flaw stems from the application's inadequate sanitization of user-supplied input, allowing malicious actors to trigger error messages that inadvertently reveal sensitive filesystem information including absolute paths, directory structures, and potentially server configuration details.
The technical implementation of this vulnerability falls under CWE-200, which specifically addresses "Information Exposure Through Output with Sensitive Data" and aligns with ATT&CK technique T1212, "Exploitation for Credential Access" through information gathering. When the application processes the malformed channel_name parameter, it fails to properly validate or sanitize the input before using it in internal operations. This leads to the generation of error messages that contain the physical path of the application's installation directory, which can be exploited by attackers to gain insights into the server's file structure. The exposure occurs because the system does not implement proper input validation controls or error handling mechanisms that would prevent sensitive path information from being returned in error responses.
The operational impact of this vulnerability extends beyond simple information disclosure as it provides attackers with crucial reconnaissance data that can be leveraged for subsequent attacks. An attacker who successfully exploits this vulnerability can obtain the absolute path of the web application, which may reveal the server's root directory structure, potentially exposing other sensitive files or directories that could be targeted in further exploitation attempts. The vulnerability also increases the risk of privilege escalation attacks as the leaked information can help attackers identify other potential attack vectors or misconfigurations within the system. Additionally, this information disclosure can aid in bypassing security controls that rely on obfuscation or path-based access restrictions, making the application more vulnerable to various forms of exploitation including local file inclusion attacks.
Mitigation strategies for CVE-2018-8056 should focus on implementing robust input validation and error handling mechanisms throughout the application. The most effective approach involves sanitizing all user-supplied input, particularly parameters used in critical operations such as channel management, and implementing comprehensive error handling that prevents sensitive path information from being exposed in error responses. Organizations should also consider implementing proper access controls and authentication mechanisms to limit access to administrative endpoints. Regular security audits and code reviews should be conducted to identify similar vulnerabilities in other parts of the application, while also ensuring that the application follows secure coding practices as outlined in OWASP Top 10 and ISO 27001 standards. The patch for this vulnerability would require updating to a newer version of Cobub Razor that addresses the improper input validation and error handling issues, or implementing custom fixes that properly validate the channel_name parameter and sanitize all error outputs to prevent path leakage.