CVE-2022-40083 in Echo
Summary
by MITRE • 09/28/2022
Labstack Echo v4.8.0 was discovered to contain an open redirect vulnerability via the Static Handler component. This vulnerability can be leveraged by attackers to cause a Server-Side Request Forgery (SSRF).
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Analysis
by VulDB Data Team • 10/25/2022
The vulnerability identified as CVE-2022-40083 affects Labstack Echo version 4.8.0 and represents a critical security flaw within the Static Handler component that enables attackers to manipulate redirect behavior. This issue stems from insufficient input validation and sanitization mechanisms within the framework's static file serving functionality, creating an avenue for malicious actors to exploit the application's redirect capabilities for unauthorized access. The vulnerability manifests when the application processes user-supplied paths or URLs that are subsequently used in redirect operations without proper validation, allowing attackers to craft malicious requests that can influence the application's redirect behavior.
The technical implementation of this vulnerability resides in the Static Handler's processing logic where it fails to properly validate and sanitize input parameters before incorporating them into redirect operations. This flaw creates a direct path for Server-Side Request Forgery attacks, as attackers can manipulate the redirect mechanism to make the server make requests to internal or external systems that would otherwise be inaccessible. The vulnerability is classified under CWE-601 as an Open Redirect vulnerability, which specifically addresses the issue of redirecting users to untrusted websites or internal systems without proper validation. The security implications extend beyond simple redirection as the SSRF component allows attackers to potentially access internal services, perform reconnaissance on internal networks, or even escalate their privileges within the application's environment.
From an operational perspective, this vulnerability poses significant risks to organizations utilizing Labstack Echo v4.8.0 in production environments, particularly those handling sensitive data or operating in regulated industries. The impact of exploitation can range from data exfiltration and internal network reconnaissance to potential privilege escalation depending on the application's access controls and the target systems accessible through the server's network connections. Attackers can leverage this vulnerability to bypass authentication mechanisms, access internal APIs or services, or even perform lateral movement within the network infrastructure. The vulnerability's classification under the ATT&CK framework places it within the reconnaissance and initial access phases, specifically under techniques such as "Web Service" and "Server-Side Request Forgery" where adversaries can use the application to make unauthorized requests to internal systems.
Organizations should immediately implement mitigations including upgrading to Labstack Echo versions that address this vulnerability, implementing strict input validation for all redirect parameters, and configuring proper access controls to limit the exposure of static file handlers. Network-level mitigations such as implementing firewall rules to restrict access to internal services, deploying web application firewalls to detect and block malicious redirect attempts, and establishing proper monitoring for unusual redirect patterns can significantly reduce the risk of exploitation. Additionally, organizations should conduct thorough security assessments of their applications to identify similar vulnerabilities in other components and implement comprehensive logging to detect potential exploitation attempts. The vulnerability serves as a reminder of the critical importance of validating all user inputs and implementing proper security controls in web application frameworks to prevent attackers from leveraging seemingly minor flaws into significant security breaches.