User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.
The specific flaw exists within the code responsible for parsing font structures within Director files. While processing data within the PFR1 chunk, the process trusts a size value and compares a sign-extended counter against it within a copy loop. By providing a sufficiently large value, this flaw can be abused by a remote attacker to execute arbitrary code under the context of the user running the browser.
