CVE-2019-11283 in SMB Volume
Summary
by MITRE
Cloud Foundry SMB Volume, versions prior to v2.0.3, accidentally outputs sensitive information to the logs. A remote user with access to the SMB Volume logs can discover the username and password for volumes that have been recently created, allowing the user to take control of the SMB Volume.
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Analysis
by VulDB Data Team • 01/27/2024
The Cloud Foundry SMB Volume component prior to version 2.0.3 contained a critical logging vulnerability that exposed sensitive authentication credentials in plain text format. This vulnerability represents a serious security flaw that directly violates fundamental security principles of credential handling and information disclosure. The flaw occurs within the volume plugin architecture where authentication details for SMB shares are inadvertently written to log files during volume creation operations, creating an attack surface that allows unauthorized access to network resources.
The technical implementation of this vulnerability stems from improper input validation and logging practices within the SMB volume plugin code. When users create new SMB volumes, the system authenticates against remote servers using username and password credentials, but these credentials are logged without adequate sanitization or encryption. The logging mechanism does not distinguish between operational information and sensitive data, resulting in credential exposure that persists in log files accessible to unauthorized users. This issue aligns with CWE-209, which specifically addresses the disclosure of sensitive information through error messages and logging mechanisms, and CWE-532, which covers the insertion of sensitive information into log files.
From an operational perspective, this vulnerability creates a severe risk for organizations utilizing Cloud Foundry platforms with SMB volume integration. Remote attackers who gain access to the logging infrastructure can extract authentication credentials from log files, enabling them to impersonate legitimate users and gain unauthorized access to SMB shares. The impact extends beyond simple credential theft, as successful exploitation allows attackers to manipulate volume data, potentially leading to data corruption, unauthorized data access, or even complete compromise of the underlying storage infrastructure. This vulnerability particularly affects multi-tenant environments where log access might be shared among users or where log retention policies are insufficiently restrictive.
The security implications of this vulnerability are compounded by the fact that SMB credentials are typically long-lived and may be reused across multiple volumes, making the compromise of a single set of credentials potentially devastating. Attackers can leverage these stolen credentials to access additional systems that rely on the same authentication mechanisms, creating a chain reaction of potential security breaches. The vulnerability also violates key principles of the ATT&CK framework under T1078, which covers legitimate credentials and T1003, which addresses credential dumping techniques. Organizations implementing Cloud Foundry solutions must consider the broader implications of credential exposure and implement proper log sanitization and access controls to prevent unauthorized access to sensitive information.
Mitigation strategies should include immediate upgrade to Cloud Foundry SMB Volume plugin version 2.0.3 or later, which addresses the logging vulnerability through proper credential sanitization and enhanced logging controls. Organizations should also implement comprehensive log access controls, restrict log file permissions to authorized personnel only, and establish log retention policies that minimize the exposure window for sensitive data. Additional protective measures include monitoring for unusual log access patterns, implementing automated log scanning for credential exposure, and ensuring proper network segmentation to limit the attack surface. Regular security audits should verify that logging practices properly handle sensitive information and that access controls are appropriately configured to prevent unauthorized log file access.