CVE-2019-19266 in WebMail Server
Summary
by MITRE
IceWarp WebMail Server 12.2.0 and 12.1.x before 12.2.1.1 (and probably earlier versions) allows XSS (issue 2 of 2) in notes for objects.
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Analysis
by VulDB Data Team • 06/11/2024
The vulnerability identified as CVE-2019-19266 represents a cross-site scripting flaw within the IceWarp WebMail Server software ecosystem. This particular vulnerability affects versions 12.2.0 and 12.1.x prior to 12.2.1.1, with the potential for impact extending to earlier releases within the same lineage. The flaw manifests specifically within the notes functionality associated with various objects within the webmail server interface, creating a persistent security weakness that could be exploited by malicious actors.
The technical nature of this vulnerability stems from inadequate input validation and output encoding mechanisms within the IceWarp WebMail Server's implementation of object notes functionality. When users create or modify notes associated with different objects within the system, the server fails to properly sanitize user-supplied data before rendering it within the web interface. This insufficient sanitization creates an environment where malicious scripts can be injected and subsequently executed within the context of other users' browsers. The vulnerability operates as a classic reflected cross-site scripting attack vector, where malicious payloads are stored on the server and executed when legitimate users access the affected notes content.
The operational impact of this vulnerability extends beyond simple data corruption or display issues. An attacker could potentially execute malicious scripts within the browser context of authenticated users, leading to session hijacking, credential theft, or privilege escalation within the webmail environment. The affected system's user authentication context means that successful exploitation could provide attackers with access to sensitive email communications, personal data, and potentially administrative controls within the IceWarp WebMail Server environment. This vulnerability directly violates security principles outlined in the CWE-79 category for Cross-Site Scripting, specifically addressing the failure to properly encode output data. The attack surface is particularly concerning given that the vulnerability affects core functionality used for note-taking and object management within the email server, making it likely to be frequently accessed by users.
Mitigation strategies for CVE-2019-19266 should prioritize immediate software updates to versions 12.2.1.1 or later, where the vendor has implemented proper input validation and output encoding measures. System administrators should also implement additional defensive measures including web application firewalls, content security policies, and regular security monitoring of user-generated content. The vulnerability aligns with ATT&CK technique T1059.001 for Command and Scripting Interpreter, where attackers could leverage the XSS vulnerability to execute malicious scripts against other users. Organizations should conduct comprehensive security assessments of their IceWarp WebMail Server deployments and consider implementing additional access controls and user activity monitoring to detect potential exploitation attempts. The remediation process must include thorough testing of the patched version to ensure that the XSS vulnerability has been properly addressed without introducing new functionality issues.