CVE-2012-5649 in CouchDB
Summary
by MITRE
Apache CouchDB before 1.0.4, 1.1.x before 1.1.2, and 1.2.x before 1.2.1 allows remote attackers to execute arbitrary code via a JSONP callback, related to Adobe Flash.
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Analysis
by VulDB Data Team • 03/21/2022
Apache CouchDB versions prior to 1.0.4, 1.1.x versions prior to 1.1.2, and 1.2.x versions prior to 1.2.1 contain a critical remote code execution vulnerability through JSONP callback manipulation. This vulnerability stems from insufficient input validation and sanitization of callback parameters in the JSONP functionality, which is commonly used to enable cross-domain data requests. The flaw specifically affects the way CouchDB processes callback parameters in HTTP requests, allowing malicious actors to inject arbitrary code that gets executed on the server. The vulnerability is particularly dangerous because it leverages the widespread use of Adobe Flash and JSONP techniques, which many applications utilize for cross-domain communication. Attackers can exploit this by crafting malicious HTTP requests that include specially formatted callback parameters, which then get processed by the CouchDB server and executed as code. This represents a classic command injection vulnerability that falls under CWE-94, which describes the execution of arbitrary code or commands. The attack vector typically involves sending a crafted HTTP request to the CouchDB server with a malicious callback parameter that bypasses normal input validation checks. This vulnerability directly maps to ATT&CK technique T1059.006, which covers the execution of code through JSONP callbacks and other web-based injection methods. The impact of this vulnerability is severe as it allows full remote code execution, potentially enabling attackers to gain complete control over the affected CouchDB server. This could result in data theft, server compromise, and further lateral movement within the network. The vulnerability exists because CouchDB fails to properly sanitize user-supplied callback parameters before incorporating them into server-side processing. The JSONP mechanism in CouchDB was designed to allow cross-domain data access but did not adequately validate or escape callback names, creating an opening for malicious code injection. This flaw demonstrates poor input validation practices and highlights the importance of proper sanitization of all user-provided data in web applications. Organizations using affected versions of CouchDB should immediately upgrade to patched versions to mitigate this risk. The vulnerability affects the core functionality of CouchDB's HTTP API endpoints and represents a fundamental security flaw in the application's request handling mechanism.
The security implications extend beyond simple code execution to encompass complete system compromise. When an attacker successfully exploits this vulnerability, they can execute arbitrary commands with the privileges of the CouchDB process, which typically runs with elevated permissions on the server. This could lead to data exfiltration, persistence mechanisms being installed, or the deployment of additional malicious software on the compromised system. The vulnerability's exploitation does not require authentication, making it particularly dangerous as it can be leveraged by anyone with network access to the affected CouchDB instance. The JSONP callback mechanism in CouchDB was intended to provide a simple way for web applications to access data across domains, but the implementation failed to consider the security implications of allowing arbitrary callback names to be processed without proper sanitization. This oversight created a pathway for attackers to inject malicious JavaScript or other code that gets executed within the context of the CouchDB server process. The vulnerability's classification under CWE-94 emphasizes the dangerous nature of code execution flaws, as they represent one of the most critical categories of security issues in web applications. The attack scenario typically involves an attacker sending a specially crafted HTTP request containing a malicious callback parameter that bypasses the application's normal input validation routines. This vulnerability aligns with ATT&CK technique T1203, which involves the exploitation of web application vulnerabilities to achieve remote code execution. Organizations should implement network segmentation and access controls to limit exposure of CouchDB instances to untrusted networks, while also ensuring that all systems are updated with the latest security patches. The vulnerability serves as a reminder of the importance of validating and sanitizing all input data, particularly in web applications that expose HTTP APIs. Proper implementation of input validation and output encoding would have prevented this vulnerability by ensuring that callback parameters are properly escaped and validated before being processed by the server. The security community has long recognized the risks associated with JSONP implementations, and this vulnerability reinforces the need for careful consideration of cross-domain communication mechanisms in web applications. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for suspicious requests that may attempt to exploit this and similar vulnerabilities.
The remediation process for this vulnerability involves immediate upgrading of CouchDB to versions 1.0.4, 1.1.2, or 1.2.1, which contain the necessary patches to address the JSONP callback validation issue. These patches implement proper input sanitization and validation of callback parameters to prevent malicious code injection attempts. The upgrade process should be carefully planned and tested to ensure that existing applications continue to function correctly after the update. Organizations should also conduct thorough vulnerability assessments to identify all instances of affected CouchDB versions within their environment and prioritize remediation efforts accordingly. Additionally, security teams should review their monitoring and logging configurations to ensure that attempts to exploit this vulnerability are properly detected and logged for forensic analysis. The vulnerability's exploitation requires no special privileges or authentication, making it particularly dangerous for organizations that do not properly restrict network access to their CouchDB instances. Network administrators should implement proper access controls, including firewalls and access control lists, to limit which systems can reach CouchDB endpoints. The vulnerability also highlights the importance of keeping all software components up to date and following secure coding practices. The patch for this vulnerability specifically addresses the improper handling of callback parameters in JSONP requests, ensuring that user-supplied data is properly validated and sanitized before being processed by the server. This represents a fundamental improvement in the application's security posture and demonstrates the importance of proper input validation in preventing code execution vulnerabilities. Organizations should also consider implementing automated patch management processes to ensure that security updates are deployed promptly across their infrastructure. The vulnerability serves as a case study in how seemingly innocuous features like JSONP can introduce critical security risks when not properly implemented with security in mind. Security professionals should use this vulnerability as a learning opportunity to reinforce the importance of secure coding practices and comprehensive security testing for all application components, particularly those that handle user input. The mitigation strategy should include not only the immediate patching of affected systems but also long-term improvements to development and deployment practices to prevent similar vulnerabilities from being introduced in the future.