Window Snyder, Mozilla's security chief, told SCMagazineUS.com Thursday that “about 1,200 people downloaded the pack every week since Feb. 18. Compared to 170 million users, that's a small number.”
The language pack was a single file that had a remnant of a script tag that could direct a user to a site that would play unsolicited ads.
“It was not an infection, per se, and the site it directed users to is down. The most likely scenario was that users would be seeing unwanted ads,” Snyder said.
How did it get into the pack? Said Snyder, “We did not do forensics on the developer's machine, but the most likely scenario was that the machine was infected and when the developer uploaded the pack to our add-on site, our antivirus software did not detect it.”
The virus signature was not identified until April.
A new language pack will be available shortly. Until then, Vietnamese language pack users should disable this package, she said.
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