CVE-2006-3767 in osDate
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in showprofile.php in Darren s $5 Script Archive osDate 1.1.7 and earlier allows remote attackers to inject arbitrary web script or HTML via the onerror attribute in an HTML IMG tag with a non-existent source file in txtcomment parameter, which is used when posting a comment.
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Analysis
by VulDB Data Team • 07/31/2018
This cross-site scripting vulnerability exists within the osDate 1.1.7 and earlier versions of Darren s $5 Script Archive, specifically in the showprofile.php script. The flaw occurs when user input from the txtcomment parameter is not properly sanitized before being rendered back to users. Attackers can exploit this weakness by crafting malicious HTML content containing an IMG tag with a non-existent source file and an onerror attribute that executes arbitrary JavaScript code. The vulnerability stems from the application's failure to validate or escape user-supplied data before displaying it in the web interface, creating an avenue for persistent cross-site scripting attacks.
The technical implementation of this vulnerability leverages the HTML IMG tag's error handling mechanism, where the onerror attribute executes when an image fails to load. When a user submits a comment containing such malicious markup, the application processes the txtcomment parameter without adequate input validation or output encoding. This allows the injected JavaScript to execute within the context of other users' browsers, potentially stealing session cookies, redirecting users to malicious sites, or performing unauthorized actions on behalf of victims. The vulnerability specifically affects the comment posting functionality and demonstrates a classic improper input validation issue that aligns with CWE-79 - Improper Neutralization of Input During Web Page Generation.
From an operational perspective, this vulnerability poses significant risks to user data and application integrity. An attacker could leverage this XSS flaw to hijack user sessions, deface the website, or redirect users to phishing sites that mimic the legitimate application interface. The impact extends beyond individual user accounts to potentially compromise the entire application ecosystem, as successful exploitation could lead to privilege escalation or data exfiltration. This vulnerability is particularly concerning in web applications where user-generated content is displayed without proper sanitization, as it enables attackers to create persistent malicious payloads that affect all users who view the compromised content.
Mitigation strategies should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application. The primary defense involves sanitizing all user-supplied data before rendering it in web pages, specifically implementing HTML entity encoding for any content that will be displayed in the browser context. Organizations should also consider implementing Content Security Policy (CSP) headers to limit the sources from which scripts can be executed, and employ regular security testing including dynamic application security testing to identify similar vulnerabilities. Additionally, upgrading to patched versions of osDate or implementing proper input sanitization measures such as those recommended by OWASP's XSS prevention guidelines would effectively address this vulnerability. This remediation approach aligns with ATT&CK technique T1203 - Exploitation for Client Execution and emphasizes the importance of proper data validation as outlined in the OWASP Top 10 2017 category A03: Injection.