CVE-2024-48929 in Umbraco
Summary
by MITRE • 10/22/2024
Umbraco is a free and open source .NET content management system. In versions on the 13.x branch prior to 13.5.2 and versions on the 10.x branch prior to 10.8.7, during an explicit sign-out, the server session is not fully terminated. Versions 13.5.2 and 10.8.7 contain a patch for the issue.
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Analysis
by VulDB Data Team • 03/03/2025
The vulnerability identified as CVE-2024-48929 affects Umbraco content management systems across multiple version branches, specifically targeting the session management mechanism during user sign-out operations. This issue impacts versions 13.x prior to 13.5.2 and 10.x prior to 10.8.7, representing a critical session management flaw that undermines the security posture of affected systems. The vulnerability stems from incomplete session termination during explicit sign-out processes, creating persistent access vectors that could be exploited by malicious actors.
The technical flaw manifests in the improper handling of server-side session state when users explicitly sign out of the Umbraco system. While the user interface may indicate successful sign-out, the underlying session remains active on the server, maintaining access to protected resources and functionality. This behavior violates fundamental session management principles and creates a persistent security risk where authenticated sessions can be reused or hijacked. The issue falls under CWE-613, which specifically addresses insufficient session expiration, and aligns with ATT&CK technique T1566 related to credential access through session hijacking.
The operational impact of this vulnerability extends beyond simple session persistence, creating potential attack vectors for privilege escalation and unauthorized data access. An attacker who can maintain access to a session after sign-out could potentially access sensitive content management features, modify website data, or perform administrative actions without proper authentication. The vulnerability particularly affects organizations relying on Umbraco for content management where session security is paramount, as it undermines the integrity of the authentication system and creates opportunities for prolonged unauthorized access. This flaw could enable attackers to maintain elevated privileges even after legitimate users have attempted to terminate their sessions.
Organizations should immediately implement the patches released in versions 13.5.2 and 10.8.7 to address this vulnerability. System administrators should conduct thorough security assessments to identify any potential session hijacking that may have occurred during the vulnerable period, particularly monitoring for unusual activity patterns in user sessions. The remediation process should include comprehensive testing to ensure that sign-out functionality properly terminates all session state and that no residual session data remains accessible. Additionally, organizations should consider implementing additional session monitoring and management controls, including automatic session timeout mechanisms and enhanced session validation procedures to further mitigate risks associated with session management vulnerabilities.