CVE-2010-3427

Vulnerability

Open Classifieds version 1.7.0.2 (and possibly earlier versions) contains multiple cross-site scripting (XSS) vulnerabilities. The application fails to properly sanitize user-supplied input passed via the desc, price, title, and place parameters to index.php and the subject parameter to contact.htm (related to content/contact.php). This unsanitized data is returned to the user, allowing injection of arbitrary HTML and script code. [1]

Exploitation

An unauthenticated remote attacker can craft a malicious URL or form submission containing JavaScript in any of the vulnerable parameters. When a victim visits the affected page (e.g., index.php with malicious parameters or contact.htm with a malicious subject), the injected script executes in the context of the victim's browser session. No special privileges or user interaction beyond viewing the page is required. [1]

Impact

Successful exploitation allows the attacker to execute arbitrary HTML and script code in the victim's browser. This can lead to session hijacking, defacement of the site, theft of sensitive information, or redirection to malicious sites. The attack is performed in the context of the affected domain. [1]

Mitigation

As of the disclosure date (September 2010), no official patch from the vendor has been identified. The recommended workaround is to filter malicious characters and character sequences using a web proxy or application firewall. Users should also consider upgrading to a later version if available, or implementing input validation and output encoding on the server side. [1]