Security researchers have found vulnerabilities in the Safari for Windows beta just hours after Apple released it. These include at least three that could let attackers grab complete control of the PC.

Two of the researchers blamed Apple's "false claims" about security and what they called its "hostile attitude" toward bug finders for the rush to dig up flaws.

First off the mark was David Maynor of Errata Security, who posted notice of a bug about two hours after Apple made Safari 3 available for Windows. By the end of the day, Maynor had racked up six bugs. Four could be exploited to crash the browser and/or PC in a denial of service; the other two, Maynor claimed, were remote execution vulnerabilities.

Maynor, who clashed with Apple over a demonstration of a wireless hack on a MacBook at last summer's Black Hat security conference, didn't hesitate a take at the company. "I can't speak for anybody else, but the bugs found in the beta copy of Safari on Windows work on the production copy on OS X as well," he said in a posting on the Errata site. "The exploit is robust mostly thanks to the lack of any kind of advanced security features in [Mac] OS X."

Shortly after Maynor posted his first bugs, Aviv Raff, an Israeli security researcher noted for his contributions to last July's "Month of Browser Bugs" project, announced he had found a flaw, too. "I found it using a fuzzer tool, Hamachi, that was developed by HD Moore and I," said Raff. "This is a memory corruption vulnerability, which is potentially exploitable for remote code execution."

Danish researcher Thor Larholm finished Safari for Windows' first day with the most damaging bug yet: a remote execution vulnerability accompanied by proof-of-concept exploit code. That code could be used to hijack the PC, said Larholm, who plucked the vulnerability from the browser and built the exploit in just two hours.

He laid part of the blame on Apple's inexperience in writing code for Windows. "On OS X, Apple has enjoyed the same luxury and the same curse as Internet Explorer has had on Windows, namely intimate operating system knowledge," said Larholm. "The integration with the original operating system is tightly defined, but [that] knowledge is crippled when the software is released on other systems and mistakes and mishaps occur.

"[For example] you can still find references to the OS X proprietary URL protocols "open-help-anchor:" and "network-diagnostics:" inside the resource files for the Windows release [of Safari]."

Bugs are not unknown to Apple. Other applications available to Windows users, the QuickTime media player and the iTunes music store software, have been patched several times. Four fixes for QuickTime, two last month alone, have been issued by Apple this year. In March, Apple updated iTunes so it would work more smoothly with Windows Vista.

Even so, the number of vulnerabilities discovered in Safari's debut day was stunning.

Larholm said: "Given that Apple has had a lousy track record with security on OS X, in addition to a hostile attitude towards security researchers, a lot of people are expecting to see quite a number of vulnerabilities targeted towards this new Windows browser."

Maynor did not need to spell out his position. After he and colleague "Johnny Cache" demoed a MacBook hack prior to Black Hat, both Apple and Mac bloggers criticised the pair for either faking the hack or obfuscating its true nature. Maynor and Cache stood behind their claim. Several months later, Apple quietly patched the wireless drivers the researchers had used to break into the Mac machine.

On Monday, Maynor spelled out his policy regarding Apple vulnerabilities. "If a vendor answers a vulnerability disclosure with marketing and spin attempts, we no longer report vulnerabilities to that vendor."

Raff summed it up on the posting to his blog. "On the download page [for Safari] Apple writes 'Apple engineers designed Safari to be secure from day one.' I guess we can now call it 'Day zero.'"

Apple officials did not respond to a request for comment.