CVE-2018-14574 in Django
Summary
by MITRE
django.middleware.common.CommonMiddleware in Django 1.11.x before 1.11.15 and 2.0.x before 2.0.8 has an Open Redirect.
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Analysis
by VulDB Data Team • 04/29/2023
The vulnerability identified as CVE-2018-14574 affects Django web applications running versions 1.11.x below 1.11.15 and 2.0.x below 2.0.8. This issue resides within the django.middleware.common.CommonMiddleware component which is responsible for handling various common HTTP operations including redirect functionality. The flaw manifests as an open redirect vulnerability that allows attackers to manipulate redirect URLs and potentially direct users to malicious websites. This type of vulnerability falls under CWE-601 which specifically addresses open redirect vulnerabilities where applications fail to properly validate redirect targets. The CommonMiddleware in Django is designed to handle various redirect operations including the enforcement of redirects to specific paths, but the implementation contains a logic flaw that permits arbitrary URL redirection without proper validation. When users encounter links that trigger redirects through this middleware, they may be unknowingly directed to phishing sites or other malicious destinations that the attacker has crafted to exploit the vulnerability. The operational impact of this vulnerability extends beyond simple redirection attacks as it can be leveraged as part of larger attack chains including social engineering campaigns, credential harvesting, or malware distribution. Attackers can craft malicious URLs that appear legitimate to users while actually redirecting them to harmful destinations, making this a particularly dangerous vulnerability in web applications that rely on user navigation and external link handling. The vulnerability is classified as a medium to high severity issue within the MITRE ATT&CK framework under the technique of 'T1566 - Phishing' as it enables the creation of convincing phishing attacks through manipulated redirect mechanisms. The flaw specifically affects applications that utilize the redirect functionality provided by the CommonMiddleware, making it critical for developers to understand how their applications handle user-provided redirect URLs.
The technical implementation of this vulnerability stems from insufficient input validation within the CommonMiddleware's redirect handling logic. When Django processes redirect requests through this middleware, it fails to properly sanitize or validate the target URLs before executing the redirect operation. This occurs because the middleware accepts user-provided redirect parameters without ensuring they conform to expected patterns or are restricted to internal application paths. The vulnerability is particularly concerning because Django applications often use this middleware for handling various redirect scenarios including login redirects, form submissions, and navigation between application sections. Attackers can exploit this by crafting URLs that contain malicious redirect targets in parameters or headers that get processed by the CommonMiddleware. The vulnerability is rooted in the lack of proper URL validation and normalization within the middleware's processing pipeline, which allows attackers to inject external URLs that bypass normal security checks. This flaw is consistent with common web application security patterns where input validation is insufficient to prevent manipulation of redirect behavior. The vulnerability demonstrates a classic case of inadequate security controls in web application middleware components where trust is placed in user-provided data without proper sanitization or validation.
Organizations running affected Django versions face significant operational risks when this vulnerability is exploited in the wild. The open redirect vulnerability can be leveraged by threat actors to conduct phishing attacks that appear legitimate to end users, making user education and awareness campaigns less effective against such attacks. The impact extends beyond individual user compromise to potential data breaches, credential theft, and reputational damage for organizations whose applications are exploited. Security teams must be aware that this vulnerability can be exploited through various attack vectors including email campaigns, compromised websites, or social media platforms where attackers post malicious links. The vulnerability also impacts web application security posture by weakening the overall trust model of applications that rely on redirect mechanisms for user navigation. Organizations should implement immediate mitigations including upgrading to patched versions of Django, implementing additional URL validation layers, and monitoring for suspicious redirect patterns in their application logs. The vulnerability's exploitation can be detected through security monitoring systems that track unusual redirect behavior or external URL patterns in application traffic, making it important for security operations teams to establish proper detection mechanisms. This vulnerability also highlights the importance of maintaining current security patches and implementing automated vulnerability scanning processes to identify and remediate similar issues in web application frameworks.
The recommended mitigations for CVE-2018-14574 involve immediate upgrade to patched Django versions including 1.11.15 or 2.0.8 and later. Organizations should also implement additional security controls such as validating all redirect URLs against a whitelist of approved domains or paths, implementing strict URL normalization and validation routines, and adding logging mechanisms to monitor redirect operations. Security teams should review their applications for any custom redirect handling logic that might be vulnerable to similar issues, as the vulnerability can be present in application code that extends or modifies the default middleware behavior. The patch addresses the root cause by implementing proper URL validation and ensuring that external redirects are either blocked or properly validated before execution. Additional defensive measures include configuring web application firewalls to detect and block suspicious redirect patterns, implementing content security policies that restrict redirect behavior, and establishing monitoring procedures for unusual redirect activity. Organizations should also consider implementing automated security scanning tools that can identify similar vulnerabilities in their codebase and ensure that all middleware components properly validate redirect targets. The vulnerability serves as a reminder of the importance of proper input validation and the need for comprehensive security testing of web application frameworks, particularly in middleware components that handle user-facing functionality.