CVE-2009-3594 in Blog System
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in bpost.php in BLOB Blog System before 1.2 allows remote attackers to inject arbitrary web script or HTML via the postid parameter.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 12/18/2017
The CVE-2009-3594 vulnerability represents a classic cross-site scripting flaw in the BLOB Blog System version 1.1 and earlier, demonstrating a critical weakness in input validation and output sanitization mechanisms. This vulnerability specifically targets the bpost.php script which processes blog post identifiers, creating an attack vector that allows remote adversaries to inject malicious web scripts or HTML content through the postid parameter. The flaw exists due to insufficient sanitization of user-supplied input, enabling attackers to manipulate the application's behavior and potentially compromise user sessions or execute unauthorized actions within the context of affected browsers.
The technical nature of this vulnerability aligns with CWE-79, which categorizes cross-site scripting as a code injection flaw where untrusted data is improperly incorporated into web page content. The attack occurs when the application fails to properly escape or validate the postid parameter before rendering it in the web response, allowing malicious payloads to be executed when users view affected blog posts. This represents a server-side vulnerability that can be exploited without requiring authentication, making it particularly dangerous for publicly accessible web applications. The vulnerability enables attackers to perform session hijacking, deface websites, steal cookies, or redirect users to malicious domains, all while appearing to originate from legitimate blog content.
The operational impact of CVE-2009-3594 extends beyond simple data theft or defacement, as it can serve as a stepping stone for more sophisticated attacks within the targeted environment. When exploited, this vulnerability can compromise user trust in the blog system, potentially leading to reputational damage and loss of user confidence. The attack surface is particularly concerning for blog systems that host sensitive content or user-generated material, as attackers can manipulate content delivery to target specific user groups or exploit the vulnerability to gain persistent access. This flaw demonstrates the critical importance of implementing proper input validation and output encoding practices, as it represents a fundamental security oversight in the application's data handling mechanisms.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output encoding measures across all user-supplied parameters. Organizations should deploy proper parameter sanitization techniques, including the use of allowlists for valid input values, strict validation of postid parameter formats, and implementation of Content Security Policy headers to limit script execution. The vulnerability also highlights the need for regular security assessments and code reviews to identify similar input validation gaps in legacy applications. Additionally, upgrading to BLOB Blog System version 1.2 or later resolves the issue through proper input handling mechanisms, though organizations should also implement network-level protections such as web application firewalls and intrusion detection systems to provide additional defense-in-depth measures against exploitation attempts. This vulnerability serves as a reminder of the importance of secure coding practices and the potential consequences of inadequate input validation in web applications.