CVE-2008-5668 in Textpattern
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in Textpattern (aka Txp CMS) 4.0.5 allow remote attackers to inject arbitrary web script or HTML via (1) the PATH_INFO to setup/index.php or (2) the name parameter to index.php in the comments preview section.
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Analysis
by VulDB Data Team • 10/22/2018
The CVE-2008-5668 vulnerability represents a critical cross-site scripting weakness in Textpattern Content Management System version 4.0.5 that exposes web applications to remote code execution risks through malicious script injection. This vulnerability specifically targets the application's handling of user input in two distinct attack vectors, making it particularly dangerous for content management systems that process user-generated data. The flaw resides in the application's insufficient sanitization of input parameters, allowing attackers to craft malicious payloads that persist in the application's response handling mechanisms. Textpattern CMS, being a lightweight content management solution, was particularly vulnerable due to its straightforward implementation of input validation processes that failed to adequately filter malicious content from user-supplied parameters.
The technical implementation of this vulnerability occurs through two primary pathways that exploit the application's insecure input handling practices. The first attack vector involves manipulating the PATH_INFO parameter when accessing setup/index.php, where the application fails to properly sanitize the input before processing it in the server-side script execution flow. This allows attackers to inject malicious JavaScript code that executes in the context of other users' browsers when they navigate to affected pages. The second vulnerability manifests in the comments preview functionality of index.php, where the name parameter is not adequately validated or escaped before being rendered in the HTML output. This creates a classic reflected XSS scenario where malicious scripts are injected into the comment preview section and executed when users view the comments. Both attack vectors operate under the principle of insufficient input validation, a weakness that directly maps to CWE-79, which specifically addresses cross-site scripting vulnerabilities in software applications.
The operational impact of CVE-2008-5668 extends beyond simple script injection, potentially enabling attackers to hijack user sessions, steal sensitive information, or redirect users to malicious websites. When exploited, these vulnerabilities can compromise the integrity of the entire content management system, as attackers can manipulate the application's behavior to serve malicious content to unsuspecting visitors. The reflected nature of the XSS attack means that the malicious scripts do not require persistent storage in the database, making detection more challenging for system administrators. Attackers can craft URLs that contain malicious payloads, which when clicked by other users, execute the injected code in their browser context. This capability enables various attack patterns including credential theft, session hijacking, and the deployment of malware through browser-based attacks. The vulnerability also aligns with ATT&CK technique T1566, which describes the use of malicious content to gain initial access to systems through social engineering methods that exploit user trust in legitimate web applications.
Mitigation strategies for CVE-2008-5668 must address both the immediate input sanitization issues and implement comprehensive security controls to prevent future similar vulnerabilities. Organizations should immediately upgrade to Textpattern CMS versions that have patched these vulnerabilities, as the original 4.0.5 release contained multiple security flaws that were subsequently addressed in newer releases. The implementation of proper input validation and output encoding techniques forms the core of defensive measures, requiring developers to escape all user-supplied data before rendering it in HTML contexts. This includes implementing Content Security Policy headers to prevent unauthorized script execution and employing proper parameter validation that rejects suspicious input patterns. Security measures should also include regular vulnerability assessments and input validation testing to identify similar weaknesses in other application components. Organizations must establish secure coding practices that prevent the direct insertion of user input into HTML output without proper sanitization, aligning with industry standards such as OWASP Top Ten and the Secure Coding practices outlined in NIST SP 800-160. Additionally, implementing web application firewalls and monitoring systems can provide additional layers of protection against exploitation attempts while maintaining the application's functionality and user experience.