CVE-2015-8105 in RoundCube
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in program/js/app.js in Roundcube webmail before 1.0.7 and 1.1.x before 1.1.3 allows remote authenticated users to inject arbitrary web script or HTML via the file name in a drag-n-drop file upload.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 06/26/2022
The CVE-2015-8105 vulnerability represents a critical cross-site scripting flaw discovered in Roundcube webmail software versions prior to 1.0.7 and 1.1.x before 1.1.3. This vulnerability specifically targets the program/js/app.js file which handles client-side JavaScript operations within the webmail interface. The flaw enables authenticated attackers to execute malicious code through crafted file names during drag-and-drop file upload operations, creating a significant security risk for organizations relying on this email platform.
This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is classified as a weakness in web applications that allows attackers to inject malicious scripts into web pages viewed by other users. The technical implementation flaw occurs in the client-side JavaScript processing where the application fails to properly sanitize or escape file names before rendering them in the web interface. When an authenticated user uploads a file with malicious script content in the filename, the application does not adequately validate or encode this input, allowing the malicious code to execute in the context of other users' browsers.
The operational impact of this vulnerability extends beyond simple script injection, as it can be exploited to perform various malicious activities including session hijacking, data theft, and redirection to malicious websites. An attacker who has gained authenticated access to a user's Roundcube account can upload a file with a specially crafted name containing malicious JavaScript code. When other users view the file listing or interact with the uploaded file, the injected script executes in their browser context, potentially compromising their sessions and accessing sensitive email content. This vulnerability particularly affects organizations where multiple users share the same Roundcube instance, as the attack can be propagated through the user base.
The exploitation of this vulnerability requires minimal privileges since it targets authenticated users, making it particularly dangerous in environments where user access is not strictly controlled. Attackers can leverage this flaw to create persistent backdoors in the webmail interface, capture user credentials, or redirect users to phishing sites. The vulnerability is particularly concerning because it operates at the client-side JavaScript level, making traditional server-side security controls ineffective against the attack vector. Organizations should immediately implement security patches to address this issue, as the vulnerability can be exploited without requiring special privileges beyond basic user authentication. The remediation process involves updating Roundcube to versions 1.0.7 or 1.1.3 and later, which include proper input validation and sanitization mechanisms for file names in drag-and-drop operations. Security teams should also consider implementing additional monitoring for unusual file upload patterns and user behavior that might indicate exploitation attempts.