CVE-2018-11352 in Wallabag
Summary
by MITRE
The Wallabag application 2.2.3 to 2.3.2 is affected by one cross-site scripting (XSS) vulnerability that is stored within the configuration page. This vulnerability enables the execution of a JavaScript payload each time an administrator visits the configuration page. The vulnerability can be exploited with authentication and used to target administrators and steal their sessions.
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Analysis
by VulDB Data Team • 03/26/2020
The Wallabag application version 2.2.3 through 2.3.2 contains a critical stored cross-site scripting vulnerability that poses significant security risks to administrative users. This vulnerability exists within the application's configuration page functionality, creating a persistent threat vector that allows attackers to inject malicious JavaScript code into the application's administrative interface. The flaw enables attackers to execute arbitrary JavaScript payloads whenever administrators access the configuration page, making it a particularly dangerous vulnerability due to its persistence and targeted nature.
This stored XSS vulnerability operates through the configuration page where administrators routinely perform maintenance tasks and manage application settings. When an attacker successfully injects malicious JavaScript code into the configuration parameters, the payload becomes permanently stored within the application's database or configuration files. The vulnerability requires authentication to exploit, meaning that only users with administrative privileges can be targeted, but this also makes it more insidious as it can leverage the elevated permissions of legitimate administrators. The attack vector typically involves manipulating configuration input fields or parameters that are not properly sanitized or validated before being rendered back to the administrator's browser.
The operational impact of this vulnerability extends beyond simple session hijacking, as it provides attackers with the capability to perform actions with full administrative privileges. When administrators visit the configuration page, their browsers execute the malicious JavaScript code, potentially leading to session token theft, unauthorized configuration changes, data exfiltration, or even complete system compromise. The vulnerability specifically targets administrative users because their sessions contain elevated privileges and access to sensitive application functions. According to CWE-79, this vulnerability maps directly to stored cross-site scripting flaws where user-controllable data is stored and later executed without proper sanitization. The attack pattern aligns with ATT&CK technique T1059.007 for JavaScript execution and T1566 for credential access through session hijacking.
Mitigation strategies for this vulnerability require immediate application updates to versions that address the XSS flaw, typically through proper input sanitization and output encoding of configuration parameters. Organizations should implement strict input validation on all configuration fields to prevent malicious code injection, utilize Content Security Policy headers to restrict script execution, and consider implementing additional authentication controls such as multi-factor authentication for administrative accounts. Regular security audits of administrative interfaces should be conducted to identify similar vulnerabilities, and administrators should be trained to recognize potential XSS attacks in configuration pages. The fix typically involves ensuring that all user-supplied data entered through configuration forms is properly escaped or sanitized before being stored or rendered back to the administrator's browser, preventing the execution of malicious JavaScript code.