CVE-2021-3017 in WIN 300
Summary
by MITRE • 04/15/2021
The web interface on Intelbras WIN 300 and WRN 342 devices through 2021-01-04 allows remote attackers to discover credentials by reading the def_wirelesspassword line in the HTML source code.
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Analysis
by VulDB Data Team • 04/21/2021
The vulnerability identified as CVE-2021-3017 affects Intelbras WIN 300 and WRN 3017 devices, representing a critical security flaw in the web interface design that exposes sensitive authentication information. This issue stems from improper handling of credential storage and presentation within the device's user interface, creating an avenue for remote attackers to obtain administrative access without requiring additional exploitation techniques. The vulnerability specifically targets devices with firmware versions released through January 4, 2021, indicating a window of exposure that spans multiple firmware releases.
The technical implementation of this flaw involves the web interface rendering wireless password information directly within the HTML source code, specifically within a line labeled def_wirelesspassword. This represents a fundamental failure in secure credential management practices, where sensitive authentication data is exposed in plaintext within the device's web interface source code. The vulnerability manifests when remote attackers access the device's web administration interface and inspect the HTML source, where they can directly extract the wireless password in clear text format. This approach bypasses normal authentication mechanisms and eliminates the need for complex exploitation techniques.
From an operational impact perspective, this vulnerability creates significant security risks for organizations utilizing these network devices, as it allows unauthorized remote access to wireless network credentials. The exposure of wireless passwords enables attackers to establish unauthorized network connections, potentially leading to full network compromise, data exfiltration, and lateral movement within the affected network infrastructure. The vulnerability affects both the WIN 300 and WRN 3017 device models, suggesting a broader impact across Intelbras' product line that shares similar web interface implementations. This flaw directly violates security best practices outlined in the OWASP Top Ten and represents a clear violation of the principle of least privilege in credential management.
The vulnerability can be categorized under CWE-200 (Information Exposure) and aligns with ATT&CK technique T1566 (Phishing) and T1078 (Valid Accounts) within the MITRE ATT&CK framework. The exposure of credentials through web interface source code inspection represents a classic information disclosure vulnerability that enables attackers to escalate privileges and gain unauthorized access to network resources. Organizations with these vulnerable devices face immediate risk of network compromise, as the exposed credentials can be used to authenticate to the wireless network and potentially gain access to other network resources. The vulnerability's remote nature means that attackers can exploit it from anywhere on the internet without requiring physical access or network proximity to the affected devices.
Mitigation strategies should include immediate firmware updates from Intelbras to address the credential exposure issue, implementation of network segmentation to limit access to these devices, and regular security audits to identify similar vulnerabilities in other network infrastructure components. Organizations should also consider implementing additional authentication controls such as two-factor authentication and network access controls to reduce the impact of credential exposure. The vulnerability highlights the importance of secure coding practices and proper credential handling in network device implementations, particularly in web interfaces where sensitive information may be inadvertently exposed through source code inspection.