CVE-2020-28149 in myDBR
Summary
by MITRE • 03/16/2021
myDBR 5.8.3/4262 is affected by: Cross Site Scripting (XSS). The impact is: execute arbitrary code (remote). The component is: CSRF Token. The attack vector is: CSRF token injection to XSS.
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Analysis
by VulDB Data Team • 04/01/2021
The vulnerability identified as CVE-2020-28149 affects myDBR version 5.8.3/4262 and represents a critical cross site scripting flaw that enables remote code execution through improper handling of CSRF tokens. This vulnerability resides within the CSRF token component of the application, creating a dangerous attack surface where malicious actors can inject malicious content into the token mechanism itself. The flaw allows attackers to manipulate the CSRF token validation process, ultimately leading to full remote code execution capabilities.
The technical implementation of this vulnerability stems from inadequate input sanitization and validation within the CSRF token generation and processing logic. When the application generates or validates CSRF tokens, it fails to properly escape or encode user-supplied data that may be incorporated into the token structure. This weakness creates a direct pathway for attackers to inject malicious scripts that can execute within the context of authenticated users' browsers. The vulnerability operates through a sophisticated chain where CSRF token injection directly translates to XSS exploitation, bypassing traditional security controls that might otherwise prevent such attacks.
From an operational impact perspective, this vulnerability presents a severe risk to organizations utilizing myDBR 5.8.3/4262 as it allows attackers to execute arbitrary code remotely without requiring authentication. Once exploited, the vulnerability can enable attackers to escalate privileges, access sensitive data, modify database content, or even compromise the entire application server. The remote execution capability means that attackers can leverage this vulnerability from any location, making it particularly dangerous for web applications that are publicly accessible. The impact extends beyond simple data theft as the ability to execute arbitrary code provides attackers with complete control over the affected system.
The attack vector specifically exploits the CSRF token injection mechanism, which is typically designed to prevent cross site request forgery attacks but becomes the very mechanism that enables XSS exploitation in this case. This represents a classic example of how security controls can be subverted when proper input validation is not implemented. The vulnerability aligns with CWE-79 (Cross-site Scripting) and CWE-352 (Cross-Site Request Forgery) classifications, demonstrating how weaknesses in one security domain can create exploitable conditions in another. According to ATT&CK framework, this vulnerability maps to T1059.007 (Command and Scripting Interpreter: JavaScript) and T1566.001 (Phishing: Spearphishing Attachment) as attackers can leverage the XSS capability to deliver malicious JavaScript payloads that can execute arbitrary commands.
Organizations should implement immediate mitigations including upgrading to patched versions of myDBR, implementing strict input validation for all CSRF token handling, and deploying web application firewalls that can detect and block malicious token injection attempts. Additional protective measures include implementing Content Security Policy headers, disabling unnecessary JavaScript execution, and conducting thorough security testing of all token generation and validation processes. The vulnerability also highlights the importance of proper security architecture design where CSRF protection mechanisms are not only effective against their intended purpose but also do not create new attack vectors for XSS exploitation.