CVE-2009-4568 in Webmin
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Webmin before 1.500 and Usermin before 1.430 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 08/30/2021
The CVE-2009-4568 vulnerability represents a critical cross-site scripting flaw affecting Webmin versions prior to 1.500 and Usermin versions prior to 1.430. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is one of the most prevalent and dangerous web application security weaknesses. The flaw enables remote attackers to inject malicious web scripts or HTML content into web applications, potentially compromising user sessions and data integrity. The unspecified vectors in the original description suggest that the vulnerability could be exploited through multiple input points within the web-based administration interfaces.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding within the Webmin and Usermin web interfaces. These administration tools provide web-based interfaces for system administrators to manage various server components, making them prime targets for attackers seeking to exploit web application vulnerabilities. The XSS flaw allows malicious actors to inject script code that executes in the context of other users' browsers when they access compromised pages. This could enable attackers to steal session cookies, perform unauthorized actions on behalf of users, or redirect victims to malicious sites. The vulnerability's impact is particularly severe given that Webmin and Usermin are widely used for server administration, making them attractive targets for exploitation.
Operational implications of CVE-2009-4568 extend beyond simple script injection attacks, as they can lead to complete system compromise when combined with other exploitation techniques. The vulnerability creates opportunities for attackers to escalate privileges, access sensitive system information, or establish persistent backdoors through the compromised administrative interfaces. Security professionals should note that this vulnerability operates at the application layer and can be exploited without requiring authentication for the initial injection point, making it particularly dangerous in environments where these tools are accessible from untrusted networks. The attack surface is broad since Webmin and Usermin are commonly deployed across various server configurations, increasing the potential impact of exploitation.
Mitigation strategies for CVE-2009-4568 primarily involve immediate patching of affected systems to versions 1.500 or later for Webmin and 1.430 or later for Usermin. Organizations should also implement robust input validation mechanisms and output encoding practices to prevent similar vulnerabilities in custom web applications. Network segmentation and access controls should be enforced to limit exposure of administrative interfaces to trusted networks only. Security monitoring should include detection of suspicious script injection attempts in web application logs, with particular attention to patterns consistent with XSS exploitation. The vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1566.001 for spearphishing via social media, as attackers may use XSS to establish initial footholds or to create more sophisticated attack vectors. Regular security assessments and web application firewalls can provide additional protective layers against exploitation of such vulnerabilities.