CVE-2020-7647 in Jooby
Summary
by MITRE
All versions before 1.6.7 and all versions after 2.0.0 inclusive and before 2.8.2 of io.jooby:jooby and org.jooby:jooby are vulnerable to Directory Traversal via two separate vectors.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 05/12/2020
The vulnerability identified as CVE-2020-7647 affects the jooby web framework, specifically targeting versions prior to 1.6.7 and versions between 2.0.0 and 2.8.1 inclusive. This directory traversal vulnerability represents a critical security flaw that allows attackers to access files and directories outside the intended web root, potentially leading to unauthorized data access and system compromise. The vulnerability manifests through two distinct attack vectors, amplifying the potential impact on affected systems. The jooby framework is widely used for building web applications in java environments, making this vulnerability particularly concerning for organizations relying on this technology stack. Directory traversal attacks exploit insufficient input validation to manipulate file paths and gain access to sensitive system resources that should remain protected from external access.
The technical implementation of this vulnerability stems from inadequate sanitization of user-supplied input within the framework's file handling mechanisms. When jooby processes requests that involve file operations or path resolution, it fails to properly validate or sanitize the input parameters that determine which files to access. This weakness allows attackers to craft malicious requests containing directory traversal sequences such as "../" or similar path manipulation techniques. The vulnerability exists in the framework's core file access functions where relative paths are resolved without proper validation, enabling attackers to navigate outside the designated application directories. Both attack vectors likely involve different code paths within the framework's routing and file access handlers, creating multiple entry points for exploitation that attackers can leverage based on their specific target environment.
The operational impact of CVE-2020-7647 extends beyond simple unauthorized file access, potentially enabling attackers to retrieve sensitive configuration files, application source code, database credentials, and other confidential information. Organizations running vulnerable versions of jooby may face data breaches, compliance violations, and potential system compromise if attackers successfully exploit these directory traversal vulnerabilities. The vulnerability affects both older versions and specific newer releases, indicating that the fix was not comprehensive or that similar issues persisted in the development cycle. This creates a broader attack surface as organizations may have deployed vulnerable versions across multiple environments or may have delayed applying security patches. The impact is particularly severe in cloud environments or containerized deployments where the framework may have elevated privileges or access to sensitive system resources.
Mitigation strategies for CVE-2020-7647 require immediate patching of affected jooby versions to either 1.6.7 or 2.8.2 and later releases. Organizations should conduct comprehensive vulnerability assessments to identify all systems running vulnerable jooby versions and ensure proper patch management procedures are in place. Additional defensive measures include implementing proper input validation at all application layers, restricting file access permissions, and deploying web application firewalls that can detect and block directory traversal attempts. The vulnerability aligns with CWE-22 Directory Traversal and follows patterns consistent with ATT&CK technique T1083 File and Directory Discovery, where adversaries seek to enumerate and access sensitive files on compromised systems. Security teams should also consider implementing runtime monitoring to detect anomalous file access patterns that may indicate exploitation attempts, while ensuring that application logs capture relevant file access events for forensic analysis. Regular security testing and code reviews focusing on input validation and file handling mechanisms should become standard practice to prevent similar vulnerabilities from emerging in future development cycles.