CVE-2020-12705 in LeptonCMS
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities exist in LeptonCMS before 4.6.0.
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Analysis
by VulDB Data Team • 05/08/2020
The CVE-2020-12705 vulnerability represents a significant security flaw in LeptonCMS versions prior to 4.6.0, specifically involving multiple cross-site scripting vulnerabilities that pose substantial risks to web applications utilizing this content management system. These vulnerabilities arise from insufficient input validation and output sanitization mechanisms within the CMS framework, creating exploitable entry points for malicious actors to inject malicious scripts into web pages viewed by other users.
The technical implementation of these XSS vulnerabilities stems from the CMS's failure to properly sanitize user-supplied input across multiple application components including form fields, URL parameters, and administrative interfaces. When users submit data through various input points within the LeptonCMS interface, the system does not adequately filter or escape special characters that could be interpreted as executable script code by web browsers. This flaw allows attackers to inject malicious JavaScript code that executes in the context of other users' browsers, potentially leading to session hijacking, credential theft, or unauthorized administrative actions. The vulnerability affects both reflected and stored XSS scenarios, with reflected XSS occurring when malicious scripts are reflected from the web server to a user's browser through URL parameters, and stored XSS occurring when malicious code is permanently stored within the CMS database and executed whenever affected pages are loaded.
The operational impact of these vulnerabilities extends beyond simple script injection, as they can enable sophisticated attack vectors that compromise the integrity and confidentiality of web applications. Attackers can leverage these XSS flaws to establish persistent backdoors within the CMS environment, manipulate administrative interfaces, or redirect users to malicious websites. The vulnerabilities are particularly dangerous in environments where administrators or privileged users interact with the CMS, as successful exploitation could grant attackers full administrative control over the web application. The risk is amplified by the fact that these vulnerabilities affect core CMS functionality, meaning that any user with access to the application could potentially exploit these flaws to compromise other users or the application itself. According to CWE classification, these vulnerabilities fall under CWE-79 which specifically addresses cross-site scripting flaws, while the ATT&CK framework would categorize this under TA0001 Initial Access and TA0002 Execution phases, as attackers can use these vulnerabilities to gain initial access and execute malicious code within the victim's browser environment.
Mitigation strategies for CVE-2020-12705 primarily focus on upgrading to LeptonCMS version 4.6.0 or later, which includes comprehensive input validation and output sanitization mechanisms. Organizations should implement proper content security policies, deploy web application firewalls, and conduct regular security assessments of their CMS installations. Additionally, administrators should enforce strict input validation at all application entry points, implement proper output encoding for dynamic content, and regularly audit user permissions to minimize the impact of potential exploitation. The vulnerability highlights the critical importance of maintaining up-to-date security practices and demonstrates how seemingly simple input validation flaws can result in severe operational consequences for web applications.