CVE-2008-6724 in Pnopaste
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in index.pl in Perl Nopaste 1.0 allows remote attackers to inject arbitrary web script or HTML via the language parameter. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 11/05/2018
The vulnerability identified as CVE-2008-6724 represents a classic cross-site scripting flaw within the Perl Nopaste 1.0 web application, specifically targeting the index.pl script. This type of vulnerability falls under the broader category of CWE-79 - Improper Neutralization of Input During Web Page Generation, which is a fundamental weakness in web application security that allows malicious actors to inject client-side scripts into web pages viewed by other users. The vulnerability manifests through the language parameter, which serves as an entry point for attackers to inject arbitrary web script or HTML content into the application's response, thereby compromising the integrity of the user experience and potentially leading to more severe security consequences.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding within the Perl Nopaste application. When users submit content through the language parameter, the application fails to properly sanitize or escape the input before incorporating it into the dynamically generated web page response. This oversight creates a condition where malicious payloads can be executed within the context of other users' browsers, as the application treats the injected content as legitimate markup rather than potentially harmful script code. The vulnerability operates at the application layer, specifically affecting the web interface's handling of user-supplied parameters, and represents a failure in the principle of least privilege and input sanitization that should be fundamental to secure web development practices.
The operational impact of this vulnerability extends beyond simple script injection, creating potential pathways for more sophisticated attacks within the context of web application security. Attackers can leverage this XSS vulnerability to perform session hijacking, steal sensitive cookies, redirect users to malicious sites, or even execute arbitrary commands within the victim's browser context. The attack surface is particularly concerning given that the vulnerability affects a paste application, which typically handles user-generated content that may contain sensitive information. This makes the vulnerability exploitable in environments where users might paste code containing credentials, personal information, or other sensitive data that could be captured by malicious actors. The vulnerability aligns with ATT&CK technique T1531 - Account Access Removal and T1203 - Exploitation for Client Execution, as it enables attackers to establish persistent access through client-side exploitation.
Mitigation strategies for CVE-2008-6724 should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application's codebase. The most effective remediation involves properly sanitizing all user-supplied input, particularly parameters like language, before incorporating them into web page responses. This approach aligns with the OWASP Top Ten security practices and follows the principle of defense in depth. Organizations should implement Content Security Policy headers to limit script execution, employ proper HTML encoding for all dynamic content, and utilize parameterized queries or input sanitization libraries to prevent malicious code injection. Additionally, regular security code reviews and penetration testing should be conducted to identify similar vulnerabilities in the application's architecture. The vulnerability also highlights the importance of keeping web applications updated, as Perl Nopaste 1.0 represents an older version that likely lacks modern security features and patches that would have addressed such weaknesses. Security teams should consider implementing web application firewalls and monitoring for suspicious input patterns to detect potential exploitation attempts before they can cause significant damage to the application or its users.