CVE-2020-35569 in mymbCONNECT24
Summary
by MITRE • 02/16/2021
An issue was discovered in MB CONNECT LINE mymbCONNECT24 and mbCONNECT24 through 2.6.2. There is a self XSS issue with a crafted cookie in the login page.
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Analysis
by VulDB Data Team • 03/02/2021
The vulnerability identified as CVE-2020-35569 represents a critical self-cross-site scripting flaw affecting MB CONNECT LINE mymbCONNECT24 and mbCONNECT24 versions up to 2.6.2. This security weakness resides within the authentication mechanism of these industrial communication platforms, specifically targeting the login page where user credentials are processed. The flaw enables attackers to inject malicious scripts through manipulated cookie values that are then executed within the victim's browser context, creating a self-XSS vector that can be exploited by adversaries who gain access to the target environment. Such vulnerabilities are particularly dangerous in industrial control systems where operational technology environments often lack robust security controls compared to traditional web applications.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding mechanisms within the cookie handling process of the login interface. When users access the authentication page with a crafted cookie containing malicious script payloads, the application fails to properly sanitize or escape these values before rendering them in the browser context. This allows attackers to inject JavaScript code that executes within the user's browser session, potentially leading to session hijacking, credential theft, or further exploitation of the compromised system. The vulnerability specifically manifests when the application processes user-supplied cookie data without adequate sanitization, creating an execution path where malicious input can be interpreted as executable code.
The operational impact of CVE-2020-35569 extends beyond simple script execution, as it represents a significant threat to industrial control system security and can compromise the integrity of operational technology environments. In industrial settings where these systems are deployed, the self-XSS vulnerability can be leveraged to gain unauthorized access to critical infrastructure communication channels, potentially enabling attackers to manipulate data flows, disrupt operations, or escalate privileges within the industrial network. The vulnerability's presence in communication platforms suggests potential implications for supply chain security, as compromised systems could serve as entry points for broader attacks against connected industrial control systems. This type of vulnerability aligns with ATT&CK technique T1059.007 for scripting and T1566.001 for credential harvesting, making it particularly concerning for organizations following NIST SP 800-82 guidelines for industrial control systems security.
Mitigation strategies for CVE-2020-35569 should prioritize immediate patching of affected versions to address the root cause of the vulnerability. Organizations should implement comprehensive input validation and output encoding mechanisms throughout the application's cookie handling processes, ensuring that all user-supplied data is properly sanitized before being processed or rendered. The implementation of Content Security Policy headers can provide additional protection against script execution, while regular security assessments of industrial communication platforms should be conducted to identify similar vulnerabilities. Security teams should also establish monitoring procedures to detect anomalous cookie usage patterns that might indicate exploitation attempts. This vulnerability demonstrates the critical need for robust security controls in operational technology environments, particularly as highlighted in CWE-79 which addresses cross-site scripting flaws, and aligns with the cybersecurity framework requirements for protecting critical infrastructure assets.