CVE-2018-16889 in Ceph
Summary
by MITRE
Ceph does not properly sanitize encryption keys in debug logging for v4 auth. This results in the leaking of encryption key information in log files via plaintext. Versions up to v13.2.4 are vulnerable.
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Analysis
by VulDB Data Team • 07/03/2023
The vulnerability identified as CVE-2018-16889 affects the Ceph storage system, a distributed storage platform widely deployed in enterprise and cloud environments. This issue specifically pertains to the authentication mechanism used in Ceph's version 4 authentication protocol, where the system fails to properly sanitize encryption keys during debug logging operations. The flaw exists in versions up to and including v13.2.4, making these installations susceptible to information disclosure through log file contents. The root cause lies in the insufficient input validation and sanitization processes within the debug logging functionality that handles authentication data.
The technical implementation of this vulnerability stems from improper handling of sensitive cryptographic material within the Ceph authentication subsystem. When v4 authentication is employed, the system generates and manages encryption keys that are subsequently logged for debugging purposes. However, the logging mechanism does not adequately strip or obfuscate these encryption keys before writing them to log files, resulting in plaintext exposure of sensitive cryptographic information. This represents a critical failure in the principle of least privilege and secure logging practices, where sensitive data should never be exposed through normal operational logging channels.
The operational impact of this vulnerability extends beyond simple information disclosure, as the leaked encryption keys could potentially be exploited by malicious actors with access to the system's log files. Attackers could leverage these exposed keys to compromise the security of the entire storage cluster, potentially gaining unauthorized access to stored data or performing man-in-the-middle attacks against authenticated communications. The vulnerability affects the confidentiality aspect of the CIA triad, as the exposure of encryption keys directly undermines the cryptographic protection mechanisms that Ceph relies upon for securing data transmission and storage. This flaw particularly impacts environments where log files are not adequately protected or where multiple users have access to system logging infrastructure.
Mitigation strategies for CVE-2018-16889 should prioritize immediate patching of affected Ceph installations to versions beyond v13.2.4 where the vulnerability has been addressed. Organizations should also implement strict log file access controls and ensure that debug logging is disabled or properly configured in production environments. The remediation process should include reviewing existing log files for potential key exposure and implementing proper log sanitization procedures. From a security framework perspective, this vulnerability aligns with CWE-200, which addresses information exposure through logging mechanisms, and may map to ATT&CK techniques related to credential access and defense evasion through log manipulation. System administrators should also consider implementing centralized log management solutions with automated key detection and alerting capabilities to prevent future incidents of this nature.