CVE-2018-7660 in OpenText Documentum D2
Summary
by MITRE
In OpenText Documentum D2 Webtop v4.6.0030 build 059, a Reflected Cross-Site Scripting Vulnerability could potentially be exploited by malicious users to compromise the affected system via the servlet/Download _docbase or _username parameter.
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Analysis
by VulDB Data Team • 01/24/2020
The vulnerability identified as CVE-2018-7660 resides within OpenText Documentum D2 Webtop version 4.6.0030 build 059, representing a critical reflected cross-site scripting flaw that exposes the system to potential exploitation by unauthorized actors. This vulnerability specifically manifests through the servlet/Download endpoint where the _docbase or _username parameters fail to properly sanitize user input, creating an avenue for malicious code injection. The flaw aligns with CWE-79, which categorizes cross-site scripting vulnerabilities as weaknesses in input validation and output encoding, making it a prime target for attackers seeking to compromise web applications. The affected system operates within a document management framework that processes user requests through servlet endpoints, making the Download servlet particularly vulnerable due to its handling of sensitive parameters that are directly reflected in HTTP responses without adequate sanitization mechanisms.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious payloads containing script code within the _docbase or _username parameters of the Download servlet request. When a victim user clicks on a malicious link containing these crafted parameters, the web application reflects the malicious script back to the user's browser within the response content. This reflected XSS attack leverages the trust relationship between the user and the web application, allowing attackers to execute arbitrary JavaScript code in the victim's browser context. The vulnerability's impact extends beyond simple script execution as it can potentially enable session hijacking, credential theft, and further escalation attacks within the Documentum environment. The attack vector is particularly concerning because it requires minimal user interaction beyond clicking a malicious link, making it highly effective for social engineering campaigns.
The operational impact of this vulnerability creates significant risk for organizations utilizing OpenText Documentum D2 Webtop, as successful exploitation could lead to complete compromise of the web application and underlying document management system. Attackers could leverage the reflected XSS to establish persistent access through session manipulation, steal user credentials, or redirect victims to malicious sites that further exploit the compromised environment. The vulnerability also poses risks to data confidentiality and integrity within the Documentum repository, as attackers might gain unauthorized access to sensitive documents and metadata. Organizations using this version of Documentum face potential compliance violations and regulatory penalties due to the exposure of user data and system vulnerabilities. The attack surface is particularly broad since the vulnerability affects the core web application interface that handles document access and retrieval operations, making it a prime target for attackers seeking to compromise enterprise document management systems.
Mitigation strategies for CVE-2018-7660 should prioritize immediate patching of the affected OpenText Documentum D2 Webtop version to the latest security updates provided by the vendor. Organizations must implement robust input validation and output encoding mechanisms within the Download servlet to prevent malicious payloads from being reflected in HTTP responses. The implementation of Content Security Policy headers should be enforced to limit script execution and prevent unauthorized code injection. Additionally, network segmentation and web application firewalls should be deployed to monitor and filter suspicious traffic patterns targeting the vulnerable servlet endpoints. Security awareness training for users should emphasize the dangers of clicking untrusted links and the importance of verifying the legitimacy of web application interactions. Organizations should also conduct comprehensive vulnerability assessments of their Documentum environments to identify similar issues and implement proper access controls and authentication mechanisms to minimize potential attack surfaces. The remediation process should include thorough testing of patches to ensure they do not introduce regressions in legitimate application functionality while maintaining the security posture of the document management infrastructure.