CVE-2022-36747 in Razor
Summary
by MITRE • 08/31/2022
Razor v0.8.0 was discovered to contain a cross-site scripting (XSS) vulnerability via the function uploadchannel().
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Analysis
by VulDB Data Team • 10/10/2022
The vulnerability identified as CVE-2022-36747 affects Razor version 0.8.0 and represents a critical cross-site scripting flaw within the uploadchannel() function. This vulnerability exposes the application to malicious input manipulation that can lead to unauthorized code execution in the context of a victim's browser session. The issue stems from insufficient input validation and output sanitization mechanisms within the file upload handling functionality, creating an attack vector where malicious actors can inject malicious scripts into the application's response.
The technical implementation of this vulnerability occurs when the uploadchannel() function processes user-supplied data without proper sanitization of special characters or script tags. When a user uploads a file or submits data through this channel, the application fails to adequately filter or encode potentially dangerous input before rendering it in the web interface. This allows attackers to craft malicious payloads that execute in the victim's browser context, potentially stealing session cookies, performing unauthorized actions, or redirecting users to malicious sites.
From an operational impact perspective, this vulnerability compromises the integrity and confidentiality of user data within the Razor application environment. Attackers can leverage this XSS flaw to hijack user sessions, escalate privileges, or gain unauthorized access to sensitive information. The vulnerability affects the application's core file upload functionality, which is typically a critical component in content management and user interaction systems. The impact extends beyond immediate data theft to potential persistent threats where attackers can establish backdoors or maintain long-term access through stored XSS payloads.
Security professionals should consider this vulnerability in relation to CWE-79 which specifically addresses cross-site scripting flaws in web applications. The ATT&CK framework categorizes this as a technique under T1566 - Phishing, as attackers can use XSS to deliver malicious payloads through seemingly legitimate user interactions. The vulnerability also aligns with T1071.004 - Application Layer Protocol: DNS, as malicious scripts may attempt to exfiltrate data through DNS tunneling techniques. Organizations should implement comprehensive input validation, output encoding, and Content Security Policy headers to mitigate this risk. Additionally, regular security testing and code reviews focusing on user input handling should be conducted to prevent similar vulnerabilities in future releases.
The remediation approach requires immediate patching of the Razor application to version 0.8.1 or later, which contains the necessary fixes for the uploadchannel() function. Security teams should also implement proper input validation mechanisms that sanitize all user-supplied data, particularly before rendering it in web responses. Regular security assessments should include thorough testing of all file upload and user input handling functions to prevent similar issues. The vulnerability demonstrates the critical importance of input sanitization in web applications and highlights the need for comprehensive security testing throughout the development lifecycle to prevent XSS vulnerabilities that can compromise entire application ecosystems.