CVE-2016-8520 in Helion Eucalyptus
Summary
by MITRE
HPE Helion Eucalyptus v4.3.0 and earlier does not correctly check IAM user's permissions for accessing versioned objects and ACLs. In some cases, authenticated users with S3 permissions could also access versioned data.
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Analysis
by VulDB Data Team • 01/05/2020
The vulnerability identified as CVE-2016-8520 affects HPE Helion Eucalyptus version 4.3.0 and earlier implementations, specifically within the Identity and Access Management system that governs access to storage objects. This flaw represents a critical authorization bypass issue that undermines the security controls designed to protect versioned data within cloud storage environments. The vulnerability stems from improper validation of IAM user permissions when accessing versioned objects and access control lists, creating a pathway for unauthorized data access that could compromise sensitive information stored in cloud environments.
The technical implementation of this vulnerability resides in the insufficient permission checking mechanisms within the Eucalyptus storage service. When authenticated users with S3 permissions attempt to access versioned objects, the system fails to properly validate whether these users possess the appropriate authorization levels required for such access. This weakness allows malicious actors or compromised legitimate users to exploit the system's permission model and gain access to versioned data that should be restricted based on their IAM roles and privileges. The flaw specifically impacts the interaction between the IAM service and the storage layer, where the system does not adequately enforce access controls for versioned objects and their associated access control lists.
The operational impact of this vulnerability extends beyond simple data exposure, potentially enabling attackers to access historical versions of sensitive files, modify access controls, or perform unauthorized data operations. Organizations using Eucalyptus cloud deployments may experience unauthorized data access, data integrity compromises, and potential regulatory violations if sensitive information becomes accessible to unauthorized parties. The vulnerability is particularly concerning in multi-tenant environments where proper segregation of data between different users or organizations is critical. Attackers could leverage this flaw to access versioned objects that contain confidential information, potentially including personally identifiable information, financial data, or proprietary business information, depending on the nature of the cloud deployment.
Mitigation strategies for this vulnerability require immediate implementation of security patches provided by HPE, along with comprehensive review and reinforcement of IAM policies within Eucalyptus deployments. Organizations should implement strict access control policies that enforce proper permission checking for versioned objects and ensure that all users have appropriate authorization levels based on their roles. Security teams should conduct thorough audits of existing IAM configurations to identify potential unauthorized access paths and implement monitoring solutions that can detect anomalous access patterns to versioned data. This vulnerability aligns with CWE-284, which addresses improper access control, and represents a specific implementation weakness that could be exploited through techniques categorized under the ATT&CK framework's privilege escalation and credential access domains. The remediation process should include verification that all versioned object access is properly validated against IAM permissions and that access control lists are enforced correctly for authenticated users.