CVE-2020-18259 in ED01-CMS
Summary
by MITRE • 11/03/2021
ED01-CMS v1.0 was discovered to contain a reflective cross-site scripting (XSS) vulnerability in the component sposts.php. This vulnerability allows attackers to execute arbitrary web scripts or HTML via a crafted payload inserted into the Post title or Post content fields.
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Analysis
by VulDB Data Team • 11/09/2021
The vulnerability identified as CVE-2020-18259 affects ED01-CMS version 1.0 and represents a critical reflective cross-site scripting flaw within the sposts.php component. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting conditions where untrusted data is incorporated into web pages without proper validation or sanitization. The vulnerability exists in the manner by which the CMS processes user input within the post creation and editing interfaces, particularly when handling Post title and Post content fields. Attackers can exploit this weakness by injecting malicious scripts or HTML code that will execute in the context of other users who view the affected posts.
The technical exploitation of this vulnerability occurs through reflective XSS mechanisms where malicious payloads are reflected back to users in the application's response without proper output encoding or validation. When users browse posts containing crafted malicious content, their browsers execute the injected scripts within their own security context, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The vulnerability specifically targets the sposts.php component which handles post-related operations, making it a prime target for attackers seeking to compromise user sessions or inject persistent malicious content. This weakness enables attackers to manipulate the application's behavior and potentially gain unauthorized access to user accounts or sensitive information.
The operational impact of CVE-2020-18259 extends beyond simple script execution as it creates a persistent threat vector that can be leveraged for more sophisticated attacks. Attackers can use this vulnerability to establish persistent backdoors, steal session cookies, or redirect users to phishing sites that can harvest credentials. The reflected nature of the vulnerability means that each victim must be individually targeted with specific malicious payloads, but the potential for mass exploitation increases when considering the volume of posts that users might create or view. This vulnerability can be particularly dangerous in environments where multiple users interact with the CMS, as it provides attackers with opportunities to compromise numerous user accounts and potentially escalate privileges within the system. The vulnerability also aligns with ATT&CK technique T1566 which covers social engineering through malicious content injection.
Mitigation strategies for CVE-2020-18259 must address the core issue of insufficient input validation and output encoding within the CMS. The most effective immediate solution involves implementing proper input sanitization and output encoding mechanisms that prevent malicious scripts from being executed when user content is displayed. This includes validating all user-supplied data in the Post title and Post content fields, implementing Content Security Policy headers, and ensuring that all dynamic content is properly escaped before rendering. Additionally, developers should implement proper input validation routines that reject or sanitize potentially dangerous characters and script tags. The CMS should also be updated to a patched version that addresses this specific vulnerability, as the vulnerability has been identified and documented in security advisories. Organizations should also consider implementing web application firewalls and monitoring systems that can detect and block suspicious script injection attempts. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other components of the CMS, as this type of vulnerability often indicates broader input validation issues that may affect other parts of the application.