CVE-2020-35682 in ServiceDesk Plus
Summary
by MITRE • 03/14/2021
Zoho ManageEngine ServiceDesk Plus before 11134 allows an Authentication Bypass (only during SAML login).
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Analysis
by VulDB Data Team • 04/01/2021
The vulnerability identified as CVE-2020-35682 affects Zoho ManageEngine ServiceDesk Plus versions prior to 11134 and represents a critical authentication bypass flaw that specifically impacts the SAML login functionality. This issue creates a security weakness where unauthorized users can potentially gain access to the system without proper authentication credentials, particularly when utilizing SAML single sign-on mechanisms. The vulnerability demonstrates a fundamental failure in the authentication process validation, allowing attackers to circumvent the intended security controls that should verify user identities through SAML protocols.
The technical implementation flaw stems from insufficient validation of SAML response parameters and authentication state management within the ServiceDesk Plus application. During SAML authentication flows, the system fails to properly verify the authenticity of SAML assertions or validate the session state, enabling malicious actors to manipulate the authentication process. This weakness operates specifically during SAML login operations and does not affect other authentication methods such as local username/password authentication or LDAP integration. The vulnerability falls under the category of weak session management and inadequate input validation, aligning with CWE-287 which addresses authentication failures and CWE-305 which covers authentication bypass mechanisms.
The operational impact of this vulnerability is significant for organizations relying on SAML integration for ServiceDesk Plus access. Attackers who can exploit this flaw can potentially gain unauthorized administrative or user-level access to the service desk system, compromising sensitive data and operational integrity. The vulnerability affects the core security model of the application, particularly when organizations depend on SAML for centralized authentication management. This creates a potential attack vector that could lead to data breaches, unauthorized system modifications, privilege escalation, and disruption of service desk operations. The impact extends beyond immediate unauthorized access as it undermines the trust model that SAML is designed to establish between identity providers and service providers.
Organizations should immediately implement the vendor-provided patch for ServiceDesk Plus version 11134 or later to remediate this vulnerability. The mitigation strategy involves not only applying the security update but also conducting thorough security assessments of existing SAML configurations and monitoring for potential exploitation attempts. Security teams should review SAML implementation practices and ensure proper validation of authentication responses. Additional protective measures include implementing network-level controls to restrict access to SAML endpoints, monitoring authentication logs for suspicious activities, and maintaining regular vulnerability assessments. This vulnerability highlights the importance of proper authentication flow validation and demonstrates how SAML implementations must be carefully scrutinized for potential bypass mechanisms. The issue also emphasizes the need for continuous security testing of authentication flows and adherence to security best practices as outlined in the MITRE ATT&CK framework's authentication tactics and techniques, particularly focusing on credential access and privilege escalation vectors.