CVE-2018-17192 in NiFi
Summary
by MITRE
The X-Frame-Options headers were applied inconsistently on some HTTP responses, resulting in duplicate or missing security headers. Some browsers would interpret these results incorrectly, allowing clickjacking attacks. Mitigation: The fix to consistently apply the security headers was applied on the Apache NiFi 1.8.0 release. Users running a prior 1.x release should upgrade to the appropriate release.
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Analysis
by VulDB Data Team • 04/22/2020
The vulnerability identified as CVE-2018-17192 represents a critical security flaw in Apache NiFi's HTTP response handling mechanism that directly impacts the application's ability to prevent clickjacking attacks through improper implementation of the X-Frame-Options security header. This issue stems from inconsistent application of security headers across different HTTP responses within the NiFi web interface, creating a scenario where some responses contain duplicate X-Frame-Options headers while others completely lack them. The inconsistency in header application creates unpredictable behavior in web browsers that process these responses, ultimately undermining the security controls designed to protect users from malicious clickjacking attempts.
The technical root cause of this vulnerability lies in the improper enforcement of security header consistency within the NiFi application's HTTP response generation process. When web browsers encounter inconsistent X-Frame-Options headers, they may interpret conflicting directives differently, with some browsers potentially ignoring the presence of duplicate headers or failing to recognize missing security headers entirely. This behavior creates a window of opportunity for attackers to exploit the inconsistent security controls and execute clickjacking attacks against users interacting with the NiFi web interface. The vulnerability directly maps to CWE-16 - Improperly Controlled Modification of Dynamically-Loaded Code and CWE-1004 - Sensitive Cookie Without 'HttpOnly' Flag, as it involves improper control of security headers that are fundamental to web application security.
The operational impact of this vulnerability extends beyond simple security header inconsistency, as it fundamentally compromises the integrity of NiFi's user interface protection mechanisms. Attackers could potentially embed the NiFi web interface within malicious frames or iframes, tricking users into performing unintended actions on the target system. The inconsistent header application means that the security posture varies unpredictably across different user sessions and response types, making it difficult for security teams to properly assess and monitor the application's security state. This vulnerability affects all versions of Apache NiFi prior to 1.8.0, leaving users exposed to potential clickjacking attacks that could lead to unauthorized access, data manipulation, or privilege escalation within the NiFi environment.
The mitigation strategy implemented by Apache NiFi developers involved standardizing the application of X-Frame-Options headers across all HTTP responses in version 1.8.0, ensuring that the security header is consistently applied with appropriate values such as SAMEORIGIN or DENY. This fix aligns with the ATT&CK technique T1211 - Exploitation for Privilege Escalation and addresses the broader category of web application security misconfigurations. Organizations running vulnerable versions of NiFi should immediately upgrade to version 1.8.0 or later to remediate this vulnerability, as the inconsistent header application creates a persistent security risk that cannot be adequately mitigated through configuration changes alone. The vulnerability demonstrates the critical importance of consistent security header implementation in web applications and serves as a reminder of how seemingly minor implementation flaws can have significant security implications, particularly in enterprise security platforms like Apache NiFi that handle sensitive operational data and process control systems.