On August 17, CERT (Computer Emergency Response Team) released information about Apple Mac products facing several security Vulnerabilities.
Systems affected: Mac OS X 10.3.9 and 10.4.2 (both workstation and server)
Apps affected: Apple Safari Web browser.
Apple has addressed these issues in "Apple Security Update 2005-007"
According to CERT's writeup, the most serious vulnerabilities may allow a remote attacker to execute arbitrary code, and may open the door to bypassing security restrictions and a denial of service.
Some of the cited errors and corrections--
* A buffer overflow error in OS X Directory Service
* Buffer overflow error in OS X Server's authentication process
* Buffer overflow problem concerning rich text files
* Buffer overflow problem concerning MS Word files
* A problem inside Safari that may execute arbitrary commands via URLs within PDF files
* Safari fails to perform security checks on links in rich content
To resolve these issues, Apple recommends that Mac users install Security Update 2005-007.