CVE-2007-6243

Vulnerability

Adobe Flash Player versions 9.x up to 9.0.48.0, 8.x up to 8.0.35.0, and 7.x up to 7.0.70.0 do not sufficiently restrict the interpretation and usage of cross-domain policy files. This flaw allows a remote attacker to bypass same-origin restrictions by crafting a malicious SWF file that abuses the policy file mechanism [1].

Exploitation

An attacker can host a malicious SWF file on a domain they control or inject it into a trusted site. When a victim visits the attacker's page or a compromised site, the Flash Player processes the cross-domain policy file in an unintended manner, enabling the attacker to perform cross-domain requests or inject scripts into the victim's browser session. No authentication is required, and the attack can be triggered without explicit user interaction beyond visiting the malicious content [1].

Impact

Successful exploitation allows the attacker to conduct cross-domain attacks, including reading data from other domains, performing cross-site scripting (XSS), or executing actions on behalf of the victim within the context of the vulnerable Flash Player. The attacker gains the ability to bypass same-origin policy restrictions, potentially leading to information disclosure or session hijacking [1].

Mitigation

Adobe released updated versions of Flash Player to address this issue. Red Hat provided a security update (RHSA-2008-0980) for the flash-plugin package, which includes fixes for CVE-2007-6243 [1]. Users should upgrade to the latest Flash Player version or apply the vendor-supplied patch. No workaround is documented in the available references.