CVE-2021-40176 in Log360
Summary
by MITRE • 08/30/2021
Zoho ManageEngine Log360 before Build 5225 allows stored XSS.
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Analysis
by VulDB Data Team • 09/03/2021
The vulnerability identified as CVE-2021-40176 represents a critical stored cross-site scripting flaw within Zoho ManageEngine Log360 software prior to Build 5225. This security weakness resides in the application's handling of user input within log management and monitoring functionalities, where improperly sanitized data can be stored and subsequently executed in the context of other users' browsers. The vulnerability specifically affects the web interface components responsible for processing and displaying log data, user-generated content, and administrative configurations that are persisted within the application's database.
The technical implementation of this flaw stems from insufficient input validation and output encoding mechanisms within the Log360 application's backend processing systems. When administrators or users submit data containing malicious script payloads through various input fields, these inputs are not adequately sanitized before being stored in the database. The stored data is then retrieved and displayed in web pages without proper HTML escaping or context-appropriate encoding, creating an environment where attacker-controlled JavaScript code can execute in the browsers of unsuspecting victims who view the affected content. This vulnerability operates under the CWE-79 classification for cross-site scripting, specifically categorized as a stored XSS variant where the malicious payload persists in the application's data store.
The operational impact of this vulnerability extends beyond simple data theft or defacement, as it enables attackers to establish persistent footholds within the targeted environment. An attacker who successfully exploits this vulnerability could execute arbitrary JavaScript code in the context of any user viewing the affected content, potentially leading to session hijacking, credential theft, data exfiltration, or privilege escalation within the Log360 environment. The stored nature of the vulnerability means that the malicious code remains active even after the initial injection point, allowing for prolonged exploitation periods and making detection more challenging. This vulnerability directly maps to several ATT&CK techniques including T1566 for social engineering and T1059 for command and scripting interpreter, as attackers can leverage the persistent nature of stored XSS to maintain access and execute further malicious activities.
Organizations utilizing Zoho ManageEngine Log360 software should prioritize immediate remediation through the installation of Build 5225 or subsequent patches that address the input sanitization and output encoding deficiencies. Security teams should implement network segmentation and monitoring of user input fields to detect potential exploitation attempts, while also conducting comprehensive vulnerability assessments of the Log360 environment to identify any potential compromise indicators. The mitigation strategy should include regular security updates, input validation enforcement, and comprehensive security awareness training for administrators who interact with the Log360 interface. Additionally, organizations should consider implementing web application firewalls and content security policies to provide additional layers of protection against similar vulnerabilities in other applications within their infrastructure.