CVE-2014-8488 in Yourls
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the administrator panel in Yourls 1.7 allows remote attackers to inject arbitrary web script or HTML via a URL that is processed by the Shorten functionality.
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Analysis
by VulDB Data Team • 04/07/2022
The CVE-2014-8488 vulnerability represents a critical cross-site scripting flaw within the administrator panel of Yourls version 1.7, a popular open-source URL shortening platform. This vulnerability specifically targets the Shorten functionality which processes incoming URLs and stores them within the system. The flaw enables remote attackers to execute malicious scripts in the context of other users' browsers, potentially compromising the security of the entire administrative interface. The vulnerability arises from insufficient input validation and output sanitization within the URL processing pipeline, creating an exploitable entry point for malicious actors to inject arbitrary web script or HTML content.
The technical implementation of this vulnerability stems from the application's failure to properly sanitize user-supplied URL parameters before storing and displaying them within the administrator panel. When administrators view shortened URLs or manage the system through the web interface, the maliciously crafted input is rendered without adequate security measures. This weakness falls under the CWE-79 category of Cross-Site Scripting, specifically representing a stored XSS variant where the malicious payload persists in the application's database and executes whenever the affected page is accessed. The vulnerability is particularly dangerous because it targets the administrator panel, potentially allowing attackers to escalate privileges, steal session cookies, or perform unauthorized administrative actions.
The operational impact of this vulnerability extends beyond simple script injection, as it provides attackers with persistent access to the administrative interface of the Yourls installation. An attacker who successfully exploits this vulnerability can execute malicious code in the context of any administrator session, potentially leading to complete system compromise. The attack vector is particularly concerning because it requires minimal user interaction from the administrator, as the malicious script executes automatically when the affected page is loaded. This vulnerability aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter, specifically targeting web applications through client-side script injection. The persistence of the malicious payload means that the vulnerability remains exploitable until the affected URLs are manually removed from the system or the application is patched.
Mitigation strategies for CVE-2014-8488 should prioritize immediate patching of the Yourls application to version 1.7.1 or later, which contains the necessary input validation fixes. Organizations should implement comprehensive input sanitization measures including HTML escaping of all user-supplied content before storage and display. Network-level defenses such as web application firewalls can provide additional protection by filtering suspicious input patterns. Regular security audits of the application's input handling mechanisms should be conducted to prevent similar vulnerabilities. The fix typically involves implementing proper output encoding and input validation routines that ensure all URL parameters are properly sanitized before being processed by the Shorten functionality. Additionally, administrators should consider implementing role-based access controls and monitoring for unusual administrative activities that might indicate exploitation attempts.