CVE-2005-1135 in Simple PHP Blog
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in search.php for Simple PHP Blog (sphpBlog) 0.4.0 allows remote attackers to inject arbitrary web script or HTML via the q parameter.
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Analysis
by VulDB Data Team • 12/02/2025
The vulnerability identified as CVE-2005-1135 represents a critical cross-site scripting flaw within the Simple PHP Blog version 0.4.0 web application. This vulnerability specifically affects the search.php script which processes user input through the q parameter, creating an exploitable pathway for malicious actors to inject arbitrary web scripts or HTML content into the application's response. The flaw stems from inadequate input validation and output sanitization mechanisms that fail to properly escape or filter user-supplied data before incorporating it into the web page's dynamic content.
The technical implementation of this vulnerability aligns with CWE-79, which categorizes cross-site scripting as a weakness where untrusted data is incorporated into web page content without proper sanitization. The q parameter in search.php serves as the attack vector where malicious input can be passed directly to the application's output generation process. When the application renders search results, it fails to encode special characters or implement proper HTML escaping, allowing attackers to inject script tags, event handlers, or other malicious code that executes within the context of other users' browsers. This creates a persistent threat where compromised users' sessions could be hijacked, sensitive data could be exfiltrated, or the application's integrity could be compromised through malicious payload execution.
The operational impact of this vulnerability extends beyond simple script injection, as it enables attackers to perform various malicious activities including session hijacking, defacement of the blog content, redirection to phishing sites, and potential data theft from authenticated users. The vulnerability affects the entire user base of the affected blog instance, as any user who views search results containing malicious payloads will execute the injected code in their browser context. This creates a chain reaction where a single compromised search query can affect multiple users over time, making the vulnerability particularly dangerous for publicly accessible web applications. The attack requires no special privileges or authentication, as it operates entirely through the public interface of the web application.
Mitigation strategies for CVE-2005-1135 should focus on implementing robust input validation and output encoding mechanisms. The most effective approach involves sanitizing all user-supplied input through proper HTML escaping before incorporating it into dynamic web content, which directly addresses the CWE-79 weakness. Applications should implement a whitelist-based approach for accepting input parameters and employ proper context-aware encoding for different output contexts such as HTML, JavaScript, and URL contexts. Additionally, the sphpBlog 0.4.0 version should be immediately upgraded to a patched release or replaced with a more secure blogging platform. Network-based protections such as web application firewalls can provide additional defense-in-depth, though they should not be relied upon as the sole mitigation. Regular security audits and input validation testing should be implemented to prevent similar vulnerabilities in future development cycles, aligning with the principles of secure coding practices and the ATT&CK framework's emphasis on preventing code injection attacks through proper input sanitization and output encoding mechanisms.