CVE-2017-5530 in tibbr Community
Summary
by MITRE
The tibbr web server components of tibbr Community, and tibbr Enterprise contain SAML protocol handling errors which may allow authorized users to impersonate other users, and therefore escalate their access privileges. Affected releases are tibbr Community 5.2.1 and below; 6.0.0; 6.0.1; 7.0.0, tibbr Enterprise 5.2.1 and below; 6.0.0; 6.0.1; 7.0.0.
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Analysis
by VulDB Data Team • 01/18/2023
The vulnerability identified as CVE-2017-5530 affects the tibbr web server components within both tibbr Community and tibbr Enterprise platforms, specifically targeting the Security Assertion Markup Language protocol implementation. This SAML handling error represents a critical authorization bypass flaw that enables authenticated users to exploit the system's identity management mechanisms. The vulnerability stems from improper validation and processing of SAML assertions within the web server components, creating a pathway for privilege escalation through user impersonation. The affected versions span multiple release lines including tibbr Community 5.2.1 and earlier, 6.0.0, 6.0.1, and 7.0.0, as well as the corresponding tibbr Enterprise versions with identical release numbers, indicating a widespread issue affecting the platform's core authentication infrastructure.
The technical flaw manifests in the SAML protocol handling implementation where the system fails to properly validate the identity claims embedded within SAML assertions. This validation gap allows an authorized user to manipulate or forge SAML tokens to assume the identity of other legitimate users within the system. The vulnerability operates at the authentication layer, specifically targeting the Single Sign-On functionality that relies on SAML for user authentication and authorization. When a user submits a SAML assertion, the system should verify the authenticity and integrity of the identity claims before granting access privileges. However, the flawed implementation permits unauthorized privilege elevation by accepting manipulated assertions that contain forged user identity information, effectively bypassing the normal access control checks that should prevent one user from accessing another user's resources or permissions.
The operational impact of this vulnerability extends beyond simple privilege escalation, creating significant security risks for organizations relying on tibbr platforms for collaboration and enterprise communication. An attacker with valid credentials could leverage this vulnerability to access sensitive data, modify user permissions, or perform administrative actions on behalf of other users within the system. This capability directly violates the principle of least privilege and undermines the integrity of the authentication system, potentially leading to data breaches, unauthorized access to confidential information, and disruption of business operations. The vulnerability affects the entire user base since any authenticated user can potentially exploit this weakness, making it particularly dangerous in environments where multiple users access shared resources or where administrative privileges are required for system maintenance.
Mitigation strategies for CVE-2017-5530 should focus on immediate patching of affected systems to address the SAML protocol handling errors. Organizations must upgrade to versions that contain the necessary security fixes and validate that all SAML implementations properly validate identity claims and assertion signatures. Network segmentation and monitoring should be implemented to detect unusual authentication patterns or suspicious SAML assertion processing. The vulnerability aligns with CWE-287 which addresses improper authentication issues and relates to ATT&CK technique T1078 for valid accounts and privilege escalation. Security teams should also implement additional controls such as multi-factor authentication, enhanced logging of authentication events, and regular security assessments of identity management systems. Organizations should conduct thorough vulnerability assessments to identify any additional SAML-related vulnerabilities and ensure that all authentication mechanisms properly enforce access controls. The remediation process must include comprehensive testing to verify that the patched systems maintain proper authentication functionality while eliminating the user impersonation capability that was previously possible through this vulnerability.