CVE-2020-36384 in PageLayer
Summary
by MITRE • 06/07/2021
PageLayer before 1.3.5 allows reflected XSS via color settings.
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Analysis
by VulDB Data Team • 06/10/2021
The vulnerability identified as CVE-2020-36384 affects PageLayer versions prior to 1.3.5 and represents a reflected cross-site scripting flaw that specifically targets color settings within the application. This issue arises from inadequate input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before it is rendered back to users in the color configuration interface. The vulnerability exists in the web application's handling of color parameters, which are typically used to customize visual elements and interface components. When users interact with the color settings functionality, the application fails to adequately escape or filter special characters that could be interpreted as HTML or JavaScript code, creating an avenue for malicious actors to inject harmful scripts.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL containing specially formatted color parameters designed to execute arbitrary JavaScript code in the context of a victim's browser session. This reflected XSS attack leverages the fact that the PageLayer application does not properly encode or validate color values before displaying them in web pages. The vulnerability specifically impacts the color settings component, which may be accessed through various user interface elements or direct URL manipulation. Attackers can construct payloads that exploit the color parameter handling to inject malicious scripts that execute when the page is loaded, potentially stealing session cookies, redirecting users to malicious sites, or performing actions on behalf of authenticated users. The reflected nature of this vulnerability means that the malicious payload is delivered via a crafted URL that, when clicked by a victim, causes the application to reflect the malicious script back to the user's browser.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform session hijacking, deface web pages, or conduct phishing attacks against authenticated users. When users with administrative privileges access the vulnerable color settings interface, attackers can potentially escalate their privileges or gain unauthorized access to sensitive system functions. The vulnerability affects the application's overall security posture by creating a persistent attack vector that remains exploitable as long as the vulnerable version is deployed. Organizations using PageLayer versions prior to 1.3.5 face significant risks, particularly in environments where users may be tricked into clicking malicious links or when the application is used in conjunction with other vulnerable components. The reflected XSS nature means that successful exploitation requires user interaction, but once a victim clicks a malicious link, the attack can be highly effective in compromising user sessions and potentially gaining deeper system access.
The remediation strategy for CVE-2020-36384 involves upgrading to PageLayer version 1.3.5 or later, which includes proper input validation and output encoding mechanisms to prevent reflected XSS attacks. Security patches should be applied immediately to all affected systems, and organizations should implement proper web application firewall rules to detect and block malicious payloads targeting color parameters. Input validation should be strengthened to reject or sanitize color values containing potentially dangerous characters, while output encoding should ensure that all user-supplied data is properly escaped before being rendered in web pages. Organizations should also consider implementing content security policies to further mitigate the impact of potential XSS vulnerabilities. This vulnerability aligns with CWE-79 which describes cross-site scripting flaws, and maps to ATT&CK technique T1203 - Exploitation for Client Execution, highlighting the need for proper input sanitization and output encoding practices. Regular security assessments and vulnerability scanning should be conducted to identify similar issues in other components of the web application stack, ensuring comprehensive protection against reflected XSS attacks and maintaining overall application security hygiene.