CVE-2021-43955 in FishEye
Summary
by MITRE • 03/16/2022
The /rest-service-fecru/server-v1 resource in Fisheye and Crucible before version 4.8.9 allowed authenticated remote attackers to obtain information about installation directories via information disclosure vulnerability.
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Analysis
by VulDB Data Team • 03/18/2022
The vulnerability identified as CVE-2021-43955 represents a critical information disclosure flaw within Atlassian Fisheye and Crucible platforms prior to version 4.8.9. This vulnerability exists within the /rest-service-fecru/server-v1 resource endpoint, which serves as a RESTful interface for server management operations. The flaw allows authenticated remote attackers to extract sensitive directory path information from the affected systems, potentially exposing critical infrastructure details that could aid in subsequent attack vectors.
The technical implementation of this vulnerability stems from insufficient input validation and output sanitization within the server-v1 resource handler. When authenticated users make requests to this specific endpoint, the system inadvertently reveals installation directory structures and file paths through its response payload. This occurs due to improper access control measures that fail to properly restrict sensitive information exposure even when users have legitimate authentication credentials. The vulnerability is classified under CWE-200, which specifically addresses information disclosure vulnerabilities where sensitive information is exposed to unauthorized parties.
From an operational impact perspective, this information disclosure vulnerability significantly weakens the security posture of affected organizations. The leaked directory information can provide attackers with valuable reconnaissance data including installation paths, file structures, and potentially database locations. This intelligence can be leveraged to craft more sophisticated attacks, such as path traversal exploits, or to identify additional vulnerabilities within the application's file system. The vulnerability affects the confidentiality aspect of the CIA triad, as it exposes sensitive system information that should remain protected from unauthorized access.
The attack vector for this vulnerability requires an authenticated user, which means that attackers must first obtain valid credentials through phishing, credential stuffing, or other compromise techniques. However, once authenticated, the attacker can leverage this information disclosure to gain insights into the system architecture and potentially identify other weaknesses in the application's configuration. This aligns with the ATT&CK framework's reconnaissance phase, where attackers gather information about their target environment to plan more effective attacks. Organizations using affected versions should prioritize immediate remediation through patching to address this vulnerability.
Mitigation strategies for CVE-2021-43955 primarily focus on applying the vendor-provided security patches released in version 4.8.9 and subsequent updates. Additionally, organizations should implement network segmentation to limit access to administrative endpoints and enforce strict access controls for authenticated users. Regular security audits should verify that sensitive information is properly protected and that no unnecessary directory traversal or path exposure occurs in application responses. The vulnerability highlights the importance of maintaining up-to-date software versions and implementing proper input validation controls to prevent information leakage through API endpoints.