CVE-2007-0769 in Phorum
Summary
by MITRE
** DISPUTED ** Cross-site scripting (XSS) vulnerability in register.php in Phorum 5.1.18 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors. NOTE: the vendor disputes this vulnerability, stating that "The characters are escaped properly."
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Analysis
by VulDB Data Team • 08/07/2024
The vulnerability identified as CVE-2007-0769 pertains to a cross-site scripting issue discovered in Phorum version 5.1.18's register.php script. This type of vulnerability falls under the broader category of web application security flaws that enable malicious actors to inject client-side scripts into web pages viewed by other users. The reported vulnerability exists within the registration functionality of the Phorum bulletin board system, which is a widely used open-source web forum software. The nature of this vulnerability is particularly concerning as it could potentially allow attackers to execute arbitrary web scripts or HTML code within the context of other users' browsers, thereby compromising user sessions and potentially leading to further exploitation.
The technical flaw in question involves the improper handling of user input within the registration process, specifically in how the system processes and renders data submitted through the register.php interface. While the exact vectors remain unspecified in the initial report, XSS vulnerabilities typically occur when applications fail to properly sanitize or escape user-supplied data before incorporating it into dynamic web content. This particular case demonstrates the classic pattern where input validation mechanisms are insufficient or absent, allowing malicious payloads to be stored and subsequently executed when other users view the affected content. The vulnerability's classification aligns with CWE-79, which specifically addresses Cross-site Scripting flaws in web applications. The issue represents a failure in input sanitization and output encoding practices that are fundamental to preventing XSS attacks.
The operational impact of this vulnerability, if exploitable, would be significant for any organization utilizing Phorum 5.1.18 for their web forum infrastructure. Attackers could potentially execute malicious scripts that might steal session cookies, redirect users to phishing sites, deface the forum content, or perform actions on behalf of authenticated users. The potential for session hijacking makes this particularly dangerous as it could lead to unauthorized access to user accounts and potentially administrative privileges within the forum system. Furthermore, the vulnerability could be leveraged to spread malware or conduct social engineering attacks by manipulating the forum's display to appear legitimate while executing malicious code in the background. According to ATT&CK framework, this vulnerability would map to T1531 - Account Access Removal and potentially T1059 - Command and Scripting Interpreter, depending on the payload executed.
However, the vendor's response to this vulnerability is noteworthy as they dispute its existence, claiming that "The characters are escaped properly." This vendor denial introduces an important consideration in vulnerability assessment and validation processes. Such disputes are common in security research where vendors may disagree with reported findings or believe their mitigation measures are sufficient. The vendor's assertion about proper character escaping suggests that they may have implemented some form of input sanitization or output encoding that they believe adequately protects against XSS attacks. This highlights the complexity of vulnerability assessment and the importance of independent verification of security claims. Organizations should not rely solely on vendor statements but should conduct their own security assessments and testing to validate the actual presence and impact of vulnerabilities. The situation also demonstrates the need for clear communication between security researchers and vendors regarding the nature and severity of reported issues, as well as the importance of maintaining detailed technical evidence to support vulnerability claims.