CVE-2021-36772 in ADManager Plus
Summary
by MITRE • 07/17/2021
Zoho ManageEngine ADManager Plus before 7110 allows stored XSS.
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Analysis
by VulDB Data Team • 07/22/2021
The vulnerability identified as CVE-2021-36772 affects Zoho ManageEngine ADManager Plus version 7110 and earlier, representing a critical stored cross-site scripting flaw that enables attackers to inject malicious scripts into the application's web interface. This vulnerability exists within the application's input validation mechanisms, specifically in how user-supplied data is processed and stored within the system's database. The flaw allows adversaries to persistently inject malicious JavaScript code through various input fields that are subsequently rendered to other users without proper sanitization or encoding, creating a persistent threat vector that can affect multiple users over time.
The technical implementation of this vulnerability stems from inadequate output encoding and input validation within the ADManager Plus application's web interface. When users submit data through forms or other input mechanisms, the application fails to properly sanitize or encode user-supplied content before storing it in the database. This stored data is then later retrieved and displayed to other users without appropriate security measures, allowing the malicious JavaScript code to execute in the context of other users' browsers. The vulnerability manifests across multiple application components including user management interfaces, configuration settings, and administrative panels where user input is accepted and processed.
From an operational impact perspective, this stored XSS vulnerability poses significant risks to organizations using Zoho ManageEngine ADManager Plus for Active Directory management and administrative tasks. Attackers can exploit this vulnerability to steal session cookies, perform unauthorized administrative actions, redirect users to malicious websites, or extract sensitive information from the application. The persistent nature of stored XSS means that once an attacker successfully injects malicious code, it will continue to affect all users who view the affected content until the malicious data is removed from the database. This vulnerability particularly threatens organizations that rely on ADManager Plus for critical identity and access management functions, as successful exploitation could lead to complete compromise of the administrative interface and potentially the underlying Active Directory infrastructure.
Organizations should immediately upgrade to Zoho ManageEngine ADManager Plus version 7110 or later to remediate this vulnerability, as this release contains the necessary patches and security fixes to prevent malicious script injection. Additionally, implementing proper input validation and output encoding measures can help mitigate the risk of similar vulnerabilities, including the implementation of Content Security Policy headers, regular security scanning of web applications, and comprehensive user input sanitization. Security teams should also conduct thorough penetration testing and vulnerability assessments to identify any other potential XSS vulnerabilities within their web applications. This vulnerability aligns with CWE-79, which describes cross-site scripting flaws, and represents a significant concern under the ATT&CK framework's initial access and privilege escalation techniques, particularly within the context of web application attacks and credential theft scenarios.
The remediation approach should include comprehensive testing of the patched version to ensure that the XSS vulnerability has been properly addressed without introducing regressions in application functionality. Network segmentation and monitoring should be implemented to detect potential exploitation attempts, while security awareness training for administrators can help identify suspicious activities related to user account management and configuration changes that might indicate exploitation of this vulnerability. Regular security updates and patch management processes should be strengthened to prevent similar vulnerabilities from arising in the future, particularly focusing on web application security testing and code review processes that specifically address input validation and output encoding requirements.