CVE-2019-14349 in EspoCRM
Summary
by MITRE
EspoCRM version 5.6.4 is vulnerable to stored XSS due to lack of filtration of user-supplied data in the api/v1/Document functionality for storing documents in the account tab. An attacker can upload a crafted file that contains JavaScript code in its name. This code will be executed when a user opens a page of any profile with this.
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Analysis
by VulDB Data Team • 11/13/2023
The vulnerability identified as CVE-2019-14349 affects EspoCRM version 5.6.4 and represents a critical stored cross-site scripting flaw within the document management functionality. This security weakness stems from inadequate input validation and sanitization mechanisms in the api/v1/Document endpoint, specifically when processing document uploads in the account tab section of the application. The vulnerability allows malicious actors to exploit the system by uploading specially crafted files with JavaScript code embedded in their filenames, creating a persistent threat that can compromise user sessions and execute arbitrary code within the victim's browser context.
The technical implementation of this vulnerability occurs through the document upload process where user-supplied filenames are not properly sanitized before being stored in the application's database and subsequently rendered in user interface elements. When legitimate users navigate to profile pages containing these maliciously named documents, the embedded JavaScript code executes in their browser, potentially leading to session hijacking, credential theft, or redirection to malicious websites. This stored XSS vulnerability operates through the principle of persistent code execution, where the malicious payload remains embedded in the application's data store and executes each time the affected page is accessed.
From an operational perspective, this vulnerability poses significant risks to organizations using EspoCRM as their customer relationship management platform. The attack vector requires minimal user interaction beyond viewing a profile page, making it particularly dangerous in environments where multiple users access shared accounts or where administrative privileges are compromised. The impact extends beyond simple data theft to include potential system compromise through session manipulation, data exfiltration, and the possibility of establishing persistent backdoors within the organization's CRM infrastructure. Security professionals should consider this vulnerability as a potential entry point for broader attacks targeting the organization's customer data and business processes.
The vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws in web applications, and demonstrates characteristics consistent with ATT&CK technique T1566 related to spearphishing attacks through social engineering. Organizations should implement immediate mitigations including input validation for all file uploads, proper sanitization of user-supplied data, and the implementation of content security policies to prevent execution of unauthorized scripts. Additionally, regular security updates and patch management procedures should be enforced to prevent exploitation of known vulnerabilities in web application frameworks and content management systems. The affected version of EspoCRM should be upgraded to a patched release that properly validates and sanitizes all user inputs, particularly those related to file naming conventions and document metadata handling.