CVE-2002-0326 in Badblue
Summary
by MITRE
Cross-site scripting vulnerability in BadBlue before 1.6.1 beta allows remote attackers to execute arbitrary script and possibly additional commands via a URL that contains Javascript.
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Analysis
by VulDB Data Team • 05/18/2019
The vulnerability identified as CVE-2002-0326 represents a critical cross-site scripting flaw in the BadBlue web server software prior to version 1.6.1 beta. This vulnerability falls under the CWE-79 category of Cross-Site Scripting and specifically manifests as an input validation weakness where the application fails to properly sanitize user-supplied data before incorporating it into web responses. The flaw exists in the server's handling of URLs that contain javascript code, creating an avenue for malicious actors to inject and execute arbitrary scripts within the context of a victim's browser session.
The technical implementation of this vulnerability allows remote attackers to craft malicious URLs containing javascript payloads that, when accessed by unsuspecting users, execute within their browser environment. This occurs because BadBlue fails to implement proper output encoding or sanitization mechanisms when processing and returning URL parameters to web clients. The vulnerability is particularly dangerous as it can be exploited to steal session cookies, perform unauthorized actions on behalf of users, or redirect victims to malicious websites. The attack vector leverages the fundamental principle of XSS where untrusted data flows directly into the application's output without proper validation or sanitization.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the ability to potentially escalate privileges and access sensitive information. When users browse to malicious URLs containing the injected javascript, the scripts can access the user's session cookies, which may contain authentication tokens that grant unauthorized access to protected resources. Additionally, the vulnerability could enable attackers to perform actions such as modifying user data, conducting session hijacking, or redirecting users to phishing sites. The lack of proper input validation means that any user input flowing through the web server's URL handling mechanism could be exploited, making this a widespread concern across all web applications built on the vulnerable BadBlue platform.
Mitigation strategies for CVE-2002-0326 primarily involve upgrading to BadBlue version 1.6.1 beta or later, which includes proper input validation and output encoding mechanisms. Organizations should also implement proper web application firewall rules that can detect and block malicious javascript payloads in URL parameters. The implementation of Content Security Policy headers can provide an additional layer of protection by restricting the sources from which scripts can be loaded. Security practitioners should also conduct regular input validation testing and ensure that all user-supplied data is properly escaped or encoded before being returned in web responses. This vulnerability aligns with ATT&CK technique T1566.001 for initial access through spearphishing attachments and T1059.007 for command and scripting interpreter through javascript execution, emphasizing the need for comprehensive web application security measures.