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Google patches several serious Chrome bugs

Critical vulnerability disclosed Monday was actually fixed earlier this month

Google yesterday patched four vulnerabilities in Chrome, and disclosed that it had patched a fifth two weeks ago.

The refresh of Chrome 16 was the second security-related update for the browser this month.

One of the five bugs Google said had been quashed was actually a leftover from the Jan. 9 update. According to a blog post by Anthony Laforge, a Chrome program manager, that flaw was actually patched two weeks ago, but "[was] accidentally excluded from the release notes" at the time.

The vulnerability was the most serious of the five, rating a "critical" ranking, Google's top threat label.

According to the bug-tracking materials for Chromium, the open-source project that feeds code into Chrome, the critical bug caused the browser to crash when users saw Chrome's anti-malicious site warning and then refreshed the page.

Researcher Chamal de Silva reported the vulnerability in mid-December 2011, and was awarded $3,133 -- Google's highest bounty -- for his work. de Silva's bug was only the third time Google has paid out the $3,133 maximum, and the first time since June 2011.

In July 2010, Google boosted its top dollar bounty from $1,337 to $3,133, making the move less than a week after rival Mozilla increased Firefox bug bounties to $3,000.

Two other researchers who reported three of the remaining vulnerabilities were paid a total of $3,000 in bounties. Those bugs were rated as "high" threats.

Google has paid out more than $8,000 so far this year to independent researchers for filing bug reports. Last year, the search giant spent more than $180,000 on bounties.

Chrome accounted for 19.1% of all browsers used last month, a record for Google, according to Web metrics firm Net Application. If its share movement continues on past pace, Chrome will crack the 20% mark either this month or next.

Chrome 16 , the current stable edition, can be downloaded from Google's website.

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at @gkeizer , on Google+ or subscribe to Gregg's RSS feed . His e-mail address is [email protected] .

See more articles by Gregg Keizer .

Read more about browsers in Computerworld's Browsers Topic Center.

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