CVE-2020-20125 in ESPCMS-P8
Summary
by MITRE • 09/29/2021
EARCLINK ESPCMS-P8 contains a cross-site scripting (XSS) vulnerability in espcms_web\espcms_load.php.
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Analysis
by VulDB Data Team • 10/03/2021
The CVE-2020-20125 vulnerability represents a critical cross-site scripting flaw discovered within the EARCLINK ESPCMS-P8 content management system. This vulnerability specifically resides in the espcms_web\espcms_load.php file, making it accessible through web-based attack vectors that target user interactions with the CMS interface. The flaw allows malicious actors to inject arbitrary JavaScript code into web pages viewed by other users, creating a persistent threat that can compromise user sessions and data integrity. This type of vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is classified as a fundamental web application security weakness that has been consistently ranked among the top ten web application security risks by the OWASP Top Ten project.
The technical implementation of this XSS vulnerability occurs when user-supplied input is not properly sanitized or validated before being rendered in web page output. In the context of ESPCMS-P8, the espcms_load.php script likely processes user requests and incorporates unsanitized parameters directly into HTML responses without adequate encoding or filtering mechanisms. Attackers can exploit this weakness by crafting malicious payloads that, when executed in a victim's browser, can perform actions such as stealing session cookies, redirecting users to malicious sites, or defacing web pages. The vulnerability's impact is amplified because it affects the core loading functionality of the CMS, potentially allowing attackers to execute code within the context of the victim's browser session with the privileges of the authenticated user.
From an operational perspective, this XSS vulnerability poses significant risks to organizations using ESPCMS-P8 as their web content management solution. Successful exploitation could lead to unauthorized access to administrative functions, data theft, session hijacking, and potential lateral movement within network environments where the CMS is deployed. The vulnerability's accessibility through standard web traffic means that attackers do not require special privileges or complex attack chains to exploit it. This makes it particularly dangerous in environments where the CMS is publicly accessible or where users may inadvertently click on malicious links. The ATT&CK framework categorizes this type of vulnerability under T1059.007 for Command and Scripting Interpreter: JavaScript, highlighting how attackers can leverage web-based scripting to execute malicious code in victim environments.
Mitigation strategies for CVE-2020-20125 should focus on implementing proper input validation and output encoding mechanisms within the affected espcms_load.php script. Organizations should ensure that all user-supplied input is sanitized using appropriate encoding techniques such as HTML entity encoding before being rendered in web pages. The implementation of Content Security Policy headers can provide additional protection against XSS attacks by restricting the sources from which scripts can be loaded. Regular security updates and patches from the vendor should be applied immediately upon availability, as the vulnerability affects a core component of the CMS. Network monitoring should be enhanced to detect suspicious traffic patterns that might indicate exploitation attempts, and user education programs should be implemented to reduce the risk of social engineering attacks that could leverage this vulnerability. The remediation process should also include thorough code reviews to identify similar patterns in other parts of the application that might present comparable risks.