CVE-2019-19670 in FTP Server
Summary
by MITRE
A HTTP Response Splitting vulnerability was identified in the Web Settings Component of Web File Manager in Rumpus FTP Server 8.2.9.1. A successful exploit can result in stored XSS, website defacement, etc. via ExtraHTTPHeader to RAPR/WebSettingsGeneralSet.html.
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Analysis
by VulDB Data Team • 05/11/2025
The HTTP Response Splitting vulnerability identified in CVE-2019-19670 resides within the Web File Manager component of Rumpus FTP Server version 8.2.9.1, specifically affecting the Web Settings functionality. This vulnerability manifests in the RAPR/WebSettingsGeneralSet.html endpoint where the ExtraHTTPHeader parameter fails to properly sanitize user input, creating a pathway for malicious actors to inject malicious content into HTTP responses. The flaw represents a classic case of inadequate input validation and output encoding, allowing attackers to manipulate the HTTP response headers and potentially inject additional headers or content that can be interpreted by web browsers.
The technical implementation of this vulnerability stems from the server's failure to properly validate and sanitize the ExtraHTTPHeader parameter before incorporating it into HTTP responses. When an attacker submits malicious input through this parameter, the server processes the input without adequate sanitization, leading to potential header injection attacks. This vulnerability directly maps to CWE-113, which defines the weakness of improper neutralization of CRLF characters in HTTP headers, and aligns with ATT&CK technique T1566.001 for spearphishing attachments and T1566.002 for spearphishing with links, as attackers could leverage this vulnerability to deliver malicious content through compromised web interfaces. The vulnerability's exploitation pathway enables attackers to manipulate HTTP responses in ways that can facilitate more sophisticated attacks.
The operational impact of this vulnerability extends beyond simple header injection, as it creates a foundation for more severe security breaches including stored cross-site scripting attacks and website defacement. Attackers can leverage the response splitting capability to inject malicious JavaScript code into web pages served by the vulnerable server, potentially compromising user sessions and enabling persistent malicious activities. The stored XSS vulnerability that can be triggered through this exploit allows attackers to execute malicious scripts in the context of the victim's browser, potentially leading to credential theft, session hijacking, or unauthorized access to sensitive data. Additionally, the vulnerability enables website defacement through the injection of malicious content that can alter the appearance and functionality of web pages, potentially damaging the organization's reputation and trustworthiness.
Mitigation strategies for CVE-2019-19670 should prioritize immediate patching of the Rumpus FTP Server to version 8.2.9.2 or later, which contains the necessary fixes for the input validation and sanitization issues. Organizations should implement comprehensive input validation measures that strictly filter and sanitize all user-supplied data, particularly focusing on HTTP header parameters and special characters that could be used for header injection attacks. Network-level protections including web application firewalls and intrusion detection systems should be configured to monitor for suspicious HTTP header patterns and malformed requests that could indicate exploitation attempts. Additionally, security teams should conduct thorough penetration testing to identify any other potential injection points within the web interface and ensure that all input fields are properly validated and sanitized. The implementation of proper output encoding techniques and the enforcement of strict content security policies can further reduce the attack surface and prevent successful exploitation of similar vulnerabilities. Organizations should also consider implementing network segmentation and access controls to limit exposure of vulnerable web interfaces to untrusted networks and users.