CVE-2017-18534 in share-on-diaspora Plugin
Summary
by MITRE
The share-on-diaspora plugin before 0.7.2 for WordPress has reflected XSS in share URL parameters.
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Analysis
by VulDB Data Team • 11/28/2023
The share-on-diaspora plugin for WordPress represents a critical security vulnerability that emerged in versions prior to 072, specifically addressing reflected cross-site scripting flaws within the share URL parameters. This vulnerability exposes WordPress installations to potential exploitation through maliciously crafted URLs that can execute unauthorized scripts in users' browsers. The issue stems from inadequate input validation and output sanitization mechanisms within the plugin's handling of share parameters, creating an attack surface where malicious actors can inject harmful JavaScript code into the application's response. The reflected nature of this vulnerability means that the malicious payload is reflected back to the user through the web application's normal request processing, making it particularly dangerous as it can be delivered via email links, social media posts, or other malicious vectors that direct users to compromised share URLs.
The technical flaw manifests when the plugin fails to properly sanitize or escape user-supplied input from URL parameters before incorporating them into the HTTP response. This allows attackers to craft malicious URLs containing script tags or other executable code that gets rendered in the victim's browser when they click on the share link. The vulnerability operates at the application layer and directly impacts the integrity of the web application's output, potentially enabling session hijacking, credential theft, or redirection to malicious sites. From a cybersecurity perspective, this represents a classic reflected XSS vulnerability that aligns with CWE-79, which specifically addresses improper neutralization of input during web page generation, and falls under the broader category of web application security flaws that affect user sessions and data integrity.
The operational impact of this vulnerability extends beyond simple script execution, as it can be leveraged for sophisticated attacks including credential harvesting through session manipulation, phishing campaigns that exploit user trust in legitimate share functions, and potential privilege escalation within the WordPress environment. Attackers can craft malicious share URLs that appear legitimate to end users, making social engineering components particularly effective in exploiting this vulnerability. The reflected nature makes it challenging to defend against through traditional server-side filtering since the malicious code originates from external sources and is reflected back in the application's response. This vulnerability particularly affects WordPress installations that rely on the diaspora plugin for social sharing functionality, creating a significant risk for sites with high user interaction or those that may be targeted through phishing campaigns.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security hardening measures. The primary solution involves upgrading to plugin version 072 or later, which includes proper input sanitization and output escaping mechanisms. Organizations should implement comprehensive input validation that filters or encodes all user-supplied data before processing, particularly focusing on URL parameters that are used for share functionality. Security measures should include Content Security Policy (CSP) headers that restrict script execution and prevent unauthorized code injection, along with regular security audits of third-party plugins to ensure they meet current security standards. Additionally, implementing web application firewalls that can detect and block suspicious parameter patterns, conducting regular penetration testing to identify similar vulnerabilities, and establishing security awareness training for administrators to recognize potential phishing attempts targeting these specific attack vectors are essential defensive measures. The vulnerability also highlights the importance of maintaining current plugin versions and following security best practices outlined in frameworks such as the OWASP Top Ten and NIST cybersecurity guidelines for web application security.