CVE-2007-3364 in MyServer
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the cgi-bin/post.mscgi sample page in MyServer 0.8.9 allows remote attackers to inject arbitrary web script or HTML via the body content.
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Analysis
by VulDB Data Team • 02/13/2025
The vulnerability identified as CVE-2007-3364 represents a classic cross-site scripting flaw within the MyServer 0.8.9 web server software, specifically affecting the cgi-bin/post.mscgi sample page. This issue falls under the Common Weakness Enumeration category CWE-79 which defines weaknesses related to improper neutralization of input during web page generation, making it a critical concern for web application security. The vulnerability exists in the server's handling of user-provided content within the body parameter of the post.mscgi script, creating an avenue for malicious actors to execute arbitrary web scripts or HTML code within the context of other users' browsers.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding within the MyServer software's sample page functionality. When users submit content through the body parameter of the post.mscgi script, the application fails to properly sanitize or escape the input before incorporating it into dynamically generated web pages. This omission allows attackers to embed malicious script code within the body content, which then gets executed by victim browsers when they view the affected page. The flaw operates as a reflected XSS vulnerability since the malicious content is immediately reflected back to users without any server-side storage or processing of the input.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform various malicious activities within the context of authenticated or unauthenticated user sessions. Attackers could potentially steal session cookies, redirect users to malicious websites, deface web pages, or even escalate privileges if the vulnerable server is part of a larger web infrastructure. The vulnerability's presence in a sample page within the MyServer distribution indicates that it affects not only production environments but also development and testing systems that might be exposed to external access. This exposure creates a significant risk for organizations using MyServer, particularly those with less stringent security controls or those that have not properly secured their sample applications.
Mitigation strategies for CVE-2007-3364 should focus on immediate input validation and output encoding measures to prevent the execution of malicious scripts. Organizations should implement proper HTML entity encoding for all user-provided content before rendering it in web pages, ensuring that special characters such as angle brackets, quotes, and script tags are properly escaped. The most effective remediation involves removing or securing the vulnerable post.mscgi sample page, as the flaw exists in non-essential demonstration code that should not be accessible in production environments. Additionally, implementing a comprehensive web application firewall with XSS detection capabilities and regular security audits of web server configurations can help prevent similar vulnerabilities from being exploited in the broader attack surface. This vulnerability aligns with ATT&CK technique T1059.007 which describes the use of script-based commands to execute malicious code, demonstrating how server-side vulnerabilities can enable client-side exploitation patterns.