CVE-2007-0834 in FlashChat
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in FlashChat 4.7.8 allows remote attackers to inject arbitrary web script or HTML via the user name field when the user joins a chat room, a different vulnerability than CVE-2007-0807. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
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Analysis
by VulDB Data Team • 08/19/2018
The vulnerability identified as CVE-2007-0834 represents a critical cross-site scripting flaw within FlashChat version 4.7.8 that enables remote attackers to execute malicious code through the username field during chat room participation. This security weakness specifically targets the input validation mechanisms employed by the FlashChat application, creating an avenue for attackers to inject arbitrary web scripts or HTML content that can be executed by other users within the same chat environment. The vulnerability operates by bypassing proper sanitization of user-supplied input, allowing malicious payloads to persist within the application's session management system and execute when other users view the affected content.
The technical implementation of this XSS vulnerability stems from insufficient validation and sanitization of the username parameter when users join chat rooms. When an attacker submits a malicious username containing script tags or other HTML elements, the application fails to properly escape or filter these inputs before rendering them within the chat interface. This flaw falls under the CWE-79 category of Cross-Site Scripting, specifically representing a stored XSS variant where the malicious code is stored on the server and executed against subsequent users who encounter the compromised username. The vulnerability demonstrates a classic input validation failure that allows attackers to manipulate the application's behavior through crafted user inputs.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform various malicious activities including session hijacking, credential theft, redirection to malicious websites, and data exfiltration from users within the chat environment. When other users view chat messages containing the malicious username, their browsers execute the embedded scripts, potentially compromising their sessions or redirecting them to phishing sites. The vulnerability affects the confidentiality, integrity, and availability of the chat system by allowing unauthorized code execution and potentially providing attackers with persistent access to the application's user base. This creates a significant risk for organizations relying on FlashChat for communication, as the attack can propagate through the user community without requiring additional authentication or privileges.
Security mitigations for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms within the FlashChat application. The recommended approach includes sanitizing all user inputs through proper HTML escaping before rendering them in the chat interface, implementing Content Security Policy headers to restrict script execution, and validating username formats to prevent malicious payloads from being accepted. Organizations should also consider applying the vendor-provided security patches or upgrading to newer versions of FlashChat that address this vulnerability. Additionally, network-level protections such as web application firewalls can help detect and block malicious payloads, while user education regarding suspicious chat activity can provide an additional layer of defense against exploitation attempts. The remediation process should follow established security frameworks that align with NIST guidelines for web application security and OWASP top ten mitigation strategies to ensure comprehensive protection against similar vulnerabilities.