CVE-2021-33558 Scanner
CVE-2021-33558 Scanner - Information Disclosure vulnerability in Boa
Short Info
Level
Single Scan
Single Scan
Can be used by
Asset Owner
Estimated Time
10 seconds
Time Interval
8 days 17 hours
Scan only one
URL
Toolbox
Boa is a lightweight and high-performance web server commonly used in embedded systems and other constrained environments. It is utilized by various organizations to manage small-scale web applications or serve static content. Its minimalistic design makes it appealing for situations where resources are limited. Boa is often incorporated into network devices, embedded systems, or other hardware components needing a simple web interface. Despite being less frequently updated compared to other web servers, it offers adequate functionality for specific use cases. Security patches and regular updates are less frequent, and users need to be cautious about potential vulnerabilities.
The vulnerability in question allows attackers to retrieve sensitive information through a misconfiguration related to several HTML and JS files accessible through the Boa web server. This misconfiguration could expose log files and configurations, which should not be publicly accessible. It involves files like "backup.html", "config.js", and others that can contain crucial information. Leveraging the information disclosure, attackers can gain insights into the configuration and usage patterns of the server. This vulnerability highlights the importance of ensuring proper file permissions and access controls on web servers. Despite its age and niche usage, identifying and mitigating such vulnerabilities is crucial to maintaining system security.
Technically, the vulnerability arises due to exposed HTML and JS files that offer information revealing the server's configuration and operations. These files can often be accessed without authentication, leading to unauthorized disclosures. For example, the "log.js" script might reveal server log activities, while "config.js" could expose application settings. The vulnerability is exploited by sending GET requests to specific paths that include these misconfigured files. Successful exploitation is confirmed when these files return content with sensitive details, highlighting weak spots in server configuration.
When exploited, this vulnerability can lead to unauthorized access to sensitive files, which may contain confidential information about server setups, user data logs, or operational insights. Such disclosures could aid an attacker in crafting more sophisticated attacks against the infrastructure. The exposure of system configurations might result in easier access to internal networks or sensitive areas, possibly paving the way for subsequent attacks. Information gathered through this disclosure might lead to privacy breaches for users interacting with the affected web services. Additionally, it could increase the administrative overhead needed to curb the impact of such unauthorized disclosures.
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