CVE-2007-3135 in PhotoBlog
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in atomPhotoBlog.php in Atom Photoblog 1.0.9 and earlier allows remote attackers to inject arbitrary web script or HTML via the tag parameter.
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Analysis
by VulDB Data Team • 09/03/2018
The vulnerability identified as CVE-2007-3135 represents a classic cross-site scripting flaw within the atomPhotoBlog.php component of the Atom Photoblog content management system version 1.0.9 and earlier. This security weakness resides in the application's improper handling of user-supplied input, specifically the tag parameter that is processed without adequate sanitization or validation mechanisms. The flaw falls under the category of CWE-79 - Improper Neutralization of Input During Web Page Generation, which is a fundamental weakness in web application security that allows malicious scripts to be injected into web pages viewed by other users. The vulnerability is particularly concerning as it enables remote attackers to execute arbitrary web scripts or HTML code within the context of affected users' browsers, potentially leading to session hijacking, credential theft, or further exploitation of the compromised systems.
The technical implementation of this vulnerability stems from the application's failure to properly escape or filter user input before incorporating it into dynamically generated web content. When users submit data through the tag parameter, the application directly incorporates this input into the HTML output without appropriate context-aware encoding or validation. This creates an environment where malicious actors can craft specially formatted input that, when processed by the vulnerable script, gets executed as client-side code rather than being treated as plain text. The attack vector is particularly straightforward as it requires no authentication or specialized privileges, making it accessible to any remote attacker who can submit data to the application. This aligns with the ATT&CK technique T1059.007 - Command and Scripting Interpreter: JavaScript, where adversaries leverage XSS vulnerabilities to execute malicious JavaScript code in victims' browsers.
The operational impact of this vulnerability extends beyond simple script injection, as it provides attackers with a foothold for more sophisticated attacks within the user environment. Successful exploitation could enable attackers to steal session cookies, redirect users to malicious sites, modify page content, or even perform actions on behalf of authenticated users if the application lacks proper access controls. The vulnerability affects all users interacting with the photoblog application, making it particularly dangerous in environments where multiple users access the same system. The lack of input validation and output encoding creates a persistent threat that remains active as long as the vulnerable version of the software is deployed, potentially allowing attackers to maintain long-term access to compromised systems. This vulnerability demonstrates the critical importance of implementing proper input validation and output encoding mechanisms as recommended by OWASP Top 10 and the Web Application Security Consortium guidelines.
Mitigation strategies for CVE-2007-3135 should focus on immediate remediation through software updates and code-level fixes. The most effective solution involves upgrading to a patched version of Atom Photoblog that properly implements input validation and output encoding for all user-supplied parameters. Additionally, developers should implement context-aware output encoding, particularly using HTML entity encoding for data that will be rendered in HTML contexts. The application should employ proper input validation that rejects or sanitizes potentially malicious content before processing user input. Implementing Content Security Policy headers can provide an additional layer of protection by restricting the sources from which scripts can be loaded. Organizations should also consider deploying web application firewalls that can detect and block malicious input patterns associated with XSS attacks. The remediation process should include thorough code review to identify similar vulnerabilities in other parts of the application, as this type of input handling weakness often appears in multiple locations within web applications. Security teams should also implement monitoring and logging mechanisms to detect potential exploitation attempts and establish incident response procedures for dealing with XSS-related security events.