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Malicious sites abuse 11-year-old Firefox bug that Mozilla failed to fix

Malware authors, advert farmers, and scammers are abusing a Firefox malicious program to entice customers on malicious websites.

This would not be a large deal, because the internet is fraught with this type of malicious websites, however those web pages don’t seem to be abusing some new never-before-seen trick, however a Firefox malicious program that Mozilla engineers seem to have failed to mend within the 11 years ever because it used to be first reported again in April 2007.

The malicious program narrows right down to a malicious web page embedding an iframe inside of their supply code. The iframe makes an HTTP authentication request on any other area. This ends up in the iframe appearing an authentication modal at the malicious website, like the only underneath.


For the previous few years, malware authors, advert farmers, and scammers had been abusing this malicious program to entice customers on websites the place they display all varieties of nasties, comparable to tech give a boost to scams, advert farms that reload the web page with new advertisements in a loop, pages that push customers to shop for pretend reward playing cards, or websites that supply malware-laced tool updates.

On every occasion customers attempt to depart, the house owners of those shady websites cause the authentification modal in a loop. Each and every time the consumer dismisses it, any other request is made, and a brand new modal seems, successfully retaining the consumer captive at the malicious websites till they shut the browser altogether, and are compelled to start out a brand new surfing consultation.

However in spite of being reported time and again for seven different occasions [1, 2, 3, 4, 5, 6, 7], this factor has long past unfixed, for unknown causes, and crooks have gladly abused all of it this time.

The most recent instance of abuse comes from a consumer who reported the problem as soon as once more as of late, after touchdown on this kind of shady websites that attempted to pressure him into putting in a suspicious Firefox extension.

“To start with, it’s opened complete display screen mode. With some pretend Home windows conversation (I’m the use of Linux so I are aware of it is pretend),” the consumer mentioned. “It attempted to [force] me set up their extensions.”

“Then I press ESC to go out complete display screen. I click on the shut button of tab or window, nevertheless it does not paintings as it has this login conversation. I click on shut button of the login conversation or cancel button. Then the conversation will seem once more. I click on the ‘Do not permit’ button of extension set up pop over, however it kind of feels now not clickable. I killed the Firefox procedure, which is the one answer for me.”

Symbol: Guo Yunhe

Certain, Mozilla is an open supply venture, and it does not have limitless sources to take care of all of the reported problems, however you would suppose that when greater than 11 years a Firefox engineer would to find the time to mend an actively exploited factor.

In response to the comments left through different customers at the reported factor, the Firefox workforce’s easiest wager is to practice how Edge and Chrome have handled this similar factor.

Edge: The extend between authentication modals in Edge is huge sufficient to permit the consumer to near the tab or the browser.

Chrome: The authentication conversation window has been moved from the browser window stage to each and every tab’s stage. This implies the competitive authentication dialogs handiest blocks the tab, and now not all of the browsers, permitting the consumer to simply shut the abusive tab.

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