CVE-2012-3240 in Eucalyptus
Summary
by MITRE
The Walrus service in Eucalyptus 2.0.3 and 3.0.x before 3.0.2 allows remote attackers to gain administrator privileges via a crafted REST request.
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Analysis
by VulDB Data Team • 12/06/2021
The vulnerability identified as CVE-2012-3240 represents a critical authorization flaw within the Walrus service component of Eucalyptus cloud infrastructure platforms. This issue affects versions 2.0.3 and 3.0.x prior to 3.0.2, creating a pathway for remote attackers to escalate their privileges from regular user status to full administrator access. The Walrus service functions as Eucalyptus's object storage system, providing cloud storage capabilities that are integral to the platform's overall architecture. The vulnerability stems from insufficient input validation and authentication mechanisms within the REST API endpoints that govern administrative operations. Attackers can exploit this weakness by crafting specially formatted REST requests that bypass normal access controls, effectively allowing them to execute administrative commands without proper authorization. This type of vulnerability directly violates the principle of least privilege and represents a fundamental breakdown in the system's security model.
The technical implementation of this vulnerability involves the manipulation of REST request parameters that should normally be restricted to authorized administrators. When the Walrus service processes these crafted requests, it fails to properly validate the authentication tokens or access control lists associated with the incoming requests. This validation failure occurs at the application layer where the service should enforce strict access controls before executing any administrative operations. The flaw likely resides in the service's API endpoint handling logic, where it does not adequately verify the identity or authorization level of the requesting entity. Such issues typically fall under CWE-285, which addresses improper authorization within software applications. The attack vector is particularly dangerous because it requires no local access or prior authentication, making it exploitable over the network by any remote attacker who can send HTTP requests to the affected service. This vulnerability can be classified under ATT&CK technique T1078 which covers valid accounts and privilege escalation techniques.
The operational impact of CVE-2012-3240 extends far beyond simple unauthorized access, as it provides attackers with complete administrative control over the affected Eucalyptus environment. Once an attacker achieves administrator privileges, they can modify system configurations, create or delete storage objects, access sensitive data, and potentially compromise the entire cloud infrastructure. The scope of damage increases significantly when considering that Eucalyptus deployments often serve as foundational cloud platforms for organizations, making this vulnerability particularly attractive to threat actors. Organizations using affected versions may experience data breaches, service disruption, and potential regulatory compliance violations. The vulnerability also undermines the trust model that cloud environments rely upon, as it allows attackers to impersonate legitimate administrators and operate undetected within the system. Recovery from such an attack typically requires complete system reinstallation and security auditing, making the impact both immediate and long-term.
Mitigation strategies for CVE-2012-3240 should focus on immediate patching of affected systems, as the vendor has released versions 3.0.2 and later that address this vulnerability. Organizations should also implement network segmentation to limit access to the Walrus service endpoints, particularly restricting access to only trusted administrative networks. Additional defensive measures include implementing strict API rate limiting, monitoring for unusual REST request patterns, and deploying web application firewalls to detect and block malicious requests. Security teams should conduct thorough access control reviews and ensure that all administrative interfaces are properly secured with multi-factor authentication. The incident highlights the importance of regular security assessments and vulnerability management processes, as well as the need for robust input validation and authentication mechanisms throughout the application stack. Organizations should also consider implementing continuous monitoring solutions that can detect privilege escalation attempts and alert security teams to potential exploitation attempts. This vulnerability serves as a reminder of the critical importance of maintaining up-to-date software versions and implementing defense-in-depth strategies to protect cloud infrastructure components from unauthorized access.