CVE-2021-32814 in Skytable
Summary
by MITRE • 08/03/2021
Skytable is a NoSQL database with automated snapshots and TLS. Versions prior to 0.5.1 are vulnerable to a a directory traversal attack enabling remotely connected clients to destroy and/or manipulate critical files on the host's file system. This security bug has been patched in version 0.5.1. There are no known workarounds aside from upgrading.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 08/07/2021
The vulnerability identified as CVE-2021-32814 affects Skytable, a NoSQL database system that provides automated snapshots and transport layer security features. This directory traversal flaw represents a critical security weakness that allows remote attackers to exploit the system's file handling mechanisms and gain unauthorized access to the underlying host file system. The vulnerability specifically impacts versions prior to 0.5.1, making any deployment running older versions susceptible to exploitation. The issue stems from inadequate input validation and path handling within the database's file operations, creating an avenue for attackers to manipulate file system paths through crafted requests. This type of vulnerability falls under the CWE-22 category, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The attack vector enables malicious actors to navigate beyond the intended file system boundaries and access or modify critical system files, potentially leading to complete system compromise.
The technical implementation of this vulnerability involves the database's failure to properly sanitize user-supplied input when processing file operations or snapshot management requests. When remote clients interact with the Skytable system, they can potentially inject malicious path components that bypass normal file system access controls. This flaw allows attackers to traverse directories using sequences like "../" or similar path manipulation techniques, thereby accessing files outside of the designated database storage areas. The impact extends beyond simple data access to include the potential for complete system destruction, as attackers can not only read critical files but also modify or delete them. This capability undermines the fundamental security assumptions of the database system and compromises the integrity of the host environment. The vulnerability demonstrates a failure in the principle of least privilege, where the database service operates with elevated permissions that should be restricted to prevent such arbitrary file system manipulation.
The operational impact of CVE-2021-32814 is severe and potentially catastrophic for organizations relying on affected Skytable versions. Remote exploitation of this vulnerability can lead to complete system compromise, data destruction, and unauthorized access to sensitive information stored on the host system. Attackers can leverage this weakness to escalate privileges, install backdoors, or destroy critical system files that may result in service outages or complete system failure. The vulnerability particularly affects systems where Skytable is deployed with default configurations or where the database service runs with elevated privileges. Organizations may experience significant downtime, data loss, and potential regulatory compliance violations if sensitive data is accessed or modified through this attack vector. The lack of known workarounds means that organizations cannot mitigate the risk without upgrading to the patched version, creating an urgent security imperative for system administrators. This vulnerability aligns with the ATT&CK technique T1059.007 for Command and Scripting Interpreter and T1078.004 for Valid Accounts, as exploitation typically requires establishing remote connections and potentially escalating privileges to execute malicious commands.
The remediation strategy for CVE-2021-32814 centers exclusively on upgrading to Skytable version 0.5.1 or later, which contains the necessary patches to address the directory traversal vulnerability. System administrators should prioritize this upgrade across all affected deployments, particularly in production environments where the risk of exploitation is highest. The patch implementation addresses the core path traversal issue by implementing proper input validation and sanitization of file system paths within the database's processing logic. Organizations should also conduct comprehensive vulnerability assessments to identify any potential exploitation attempts or unauthorized access that may have occurred before the patch was applied. Security teams should review system logs for suspicious file access patterns or unusual directory traversal attempts that might indicate prior exploitation. Additionally, implementing network segmentation and access controls can provide additional defense-in-depth measures, although these are not substitutes for the required version upgrade. The vulnerability serves as a reminder of the importance of keeping database systems updated and the critical nature of input validation in preventing directory traversal attacks that can lead to complete system compromise.