CVE-2018-18017 in Tribulant Slideshow Gallery Plugin
Summary
by MITRE
XSS exists in the Tribulant Slideshow Gallery plugin 1.6.8 for WordPress via the wp-admin/admin.php?page=slideshow-galleries&method=save Gallery[id] or Gallery[title] parameter.
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Analysis
by VulDB Data Team • 08/29/2023
The vulnerability CVE-2018-18017 represents a cross-site scripting flaw within the Tribulant Slideshow Gallery WordPress plugin version 1.6.8, specifically affecting the administrative interface. This issue arises from insufficient input validation and output escaping mechanisms within the plugin's gallery management functionality. The vulnerability manifests when administrators interact with the plugin's administrative pages, particularly during gallery creation or modification processes where the Gallery[id] and Gallery[title] parameters are processed without adequate sanitization. The flaw allows malicious actors to inject arbitrary JavaScript code through these parameters, which then executes in the context of other administrators or users who view the affected pages.
The technical exploitation of this vulnerability occurs through the manipulation of URL parameters within the WordPress admin interface. When an administrator navigates to wp-admin/admin.php?page=slideshow-galleries&method=save and provides malicious input in either the Gallery[id] or Gallery[title] fields, the plugin fails to properly escape or validate the user-supplied data before rendering it back to the browser. This represents a classic reflected cross-site scripting vulnerability where the malicious payload is reflected back to the user's browser without proper sanitization. The vulnerability is categorized under CWE-79 as a failure to sanitize or escape output, and aligns with ATT&CK technique T1213 which covers data from information repositories.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with potential access to administrative functions and sensitive data within the WordPress environment. An attacker who successfully exploits this vulnerability could execute malicious scripts in the context of an administrator's browser session, potentially leading to full administrative compromise of the WordPress site. This could result in unauthorized modification of gallery content, creation of malicious galleries, or even the installation of additional malware through the compromised administrative interface. The vulnerability is particularly concerning because it affects the administrative backend where privileged users perform critical management tasks.
Mitigation strategies for CVE-2018-18017 should focus on immediate patching of the affected plugin version, as the vulnerability exists in the specific 1.6.8 release. WordPress administrators should upgrade to the latest version of the Tribulant Slideshow Gallery plugin where the XSS vulnerability has been addressed through proper input validation and output escaping mechanisms. Additionally, implementing proper security measures such as input validation at multiple layers, output encoding for all dynamic content, and regular security audits of WordPress plugins can prevent similar vulnerabilities from occurring. Network-level protections such as web application firewalls should also be configured to monitor for suspicious parameter values in administrative URLs. The vulnerability highlights the importance of maintaining up-to-date WordPress plugins and implementing security best practices such as the principle of least privilege and regular security assessments to protect against such persistent threats. Organizations should also consider implementing Content Security Policy headers to mitigate the impact of potential XSS attacks even when other defenses fail.