CVE-2017-1000058 in Chevereto
Summary
by MITRE
Stored XSS in chevereto CMS before version 3.8.11
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Analysis
by VulDB Data Team • 10/26/2019
The vulnerability CVE-2017-1000058 represents a stored cross-site scripting flaw discovered in the chevereto content management system prior to version 3.8.11. This vulnerability resides within the image upload and processing functionality of the platform, where user-supplied input is not properly sanitized before being stored in the database and subsequently rendered in web pages. The flaw allows authenticated attackers with upload privileges to inject malicious javascript code into the system through image metadata or file names, which then executes in the context of other users who view the affected images. This vulnerability directly maps to CWE-79 which defines cross-site scripting flaws as weaknesses that occur when an application includes untrusted data in a new web page without proper validation or escaping, or without the use of security headers. The attack vector specifically targets the image handling component of chevereto, where metadata fields such as title, description, or caption parameters are processed without adequate input sanitization.
The operational impact of this vulnerability extends beyond simple script execution as it provides attackers with the ability to hijack user sessions, steal sensitive information, perform unauthorized actions on behalf of victims, and potentially escalate privileges within the application. When users view images containing malicious scripts, the code executes in their browsers with the privileges of the logged-in user, enabling attackers to access personal data, modify content, or redirect users to malicious websites. The vulnerability affects the core functionality of chevereto's media management system and can be exploited through various attack scenarios including social engineering to convince users to view compromised images. According to ATT&CK framework, this vulnerability corresponds to T1059.007 for scripting and T1531 for credential access, as attackers can leverage the stored XSS to capture session cookies and credentials from victims. The exploitation process requires minimal technical skill and can be automated using existing penetration testing tools, making it particularly dangerous in environments where multiple users interact with uploaded content.
Mitigation strategies for CVE-2017-1000058 involve immediate patching of the chevereto platform to version 3.8.11 or later, where the vulnerability has been addressed through proper input validation and sanitization of user-supplied data. Organizations should implement comprehensive input validation measures that filter and sanitize all user inputs, particularly metadata fields associated with image uploads, ensuring that any potentially malicious scripts are removed or escaped before storage. Network-level defenses including web application firewalls and content security policies should be configured to detect and block suspicious script patterns in uploaded content. Regular security audits of the chevereto installation should include checks for proper sanitization of image metadata and implementation of proper output encoding. The vulnerability also highlights the importance of principle of least privilege, where upload capabilities should be restricted to trusted users only, and regular monitoring of user activities should be implemented to detect anomalous behavior. Additionally, implementing proper session management and secure cookie attributes can help mitigate the potential impact of session hijacking that may result from successful exploitation of this vulnerability.