CVE-2019-0218 in Mail Interface
Summary
by MITRE
A vulnerability was discovered wherein a specially crafted URL could enable reflected XSS via JavaScript in the pony mail interface.
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Analysis
by VulDB Data Team • 09/06/2023
The vulnerability identified as CVE-2019-0218 represents a critical cross-site scripting flaw within the pony mail interface that exploits reflected attack vectors through maliciously crafted URLs. This vulnerability resides in the web application's input validation mechanisms, specifically within the handling of user-supplied data that is subsequently reflected back to the user without proper sanitization or encoding. The flaw demonstrates characteristics consistent with CWE-79 which defines cross-site scripting vulnerabilities as weaknesses that occur when an application includes untrusted data in a new web page without proper validation or escaping, or when it reuses a client-side variable without ensuring that its contents are properly escaped.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL containing JavaScript code that gets reflected back to the victim's browser through the pony mail interface. When a user clicks such a crafted link, the malicious script executes in the context of the victim's session, potentially leading to unauthorized actions, session hijacking, or data exfiltration. The reflected nature of the attack means that the malicious payload is not stored on the server but is instead delivered and executed immediately through the user's browser. This vulnerability aligns with ATT&CK technique T1059.007 which describes the use of scripting languages to execute malicious code, specifically targeting web-based applications through reflected XSS vectors.
The operational impact of CVE-2019-0218 extends beyond simple script execution, as it can enable attackers to perform a wide range of malicious activities including but not limited to session manipulation, credential theft, redirection to malicious sites, and potential privilege escalation within the application. The pony mail interface serves as a potential entry point for attackers to compromise user sessions and gain unauthorized access to email accounts, potentially leading to data breaches or further network infiltration. Organizations utilizing this interface face significant risk if proper input validation is not implemented, as the vulnerability can be exploited through social engineering campaigns where users are tricked into clicking malicious links. The vulnerability's exploitation requires minimal technical skill from attackers, making it particularly dangerous in environments where users may not be adequately trained to identify suspicious links or URLs.
Mitigation strategies for CVE-2019-0218 should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application's data flow. The most effective approach involves sanitizing all user-supplied input before it is processed or reflected back to the user, utilizing proper HTML escaping techniques and implementing Content Security Policy headers to limit script execution. Organizations should deploy web application firewalls that can detect and block malicious URL patterns, while also implementing proper session management controls to limit the impact of successful exploitation. Regular security testing including automated scanning and manual penetration testing should be conducted to identify similar vulnerabilities in the application code. The fix should include proper validation of URL parameters and implementation of a robust sanitization framework that prevents JavaScript code from being executed in the context of the web application. Additionally, implementing proper logging and monitoring of suspicious URL patterns can help detect exploitation attempts and provide early warning of potential attacks.