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The flaw in Mozilla Firefox 1.0, details of which were published by security company Secunia on Tuesday, could allow hackers to spoof the URL in the download dialog box that pops up when a Firefox user tries to download an item from a Web site. This flaw is caused by the dialog box incorrectly displaying long sub-domains and paths, which can be exploited to conceal the actual source of the download.
Mikko Hypponen, director of antivirus research at software maker F-Secure, said this bug could make Firefox users vulnerable to cybercriminals. "The most likely way we could see this exploited would be in phishing scams," he said.
To fall victim to such a scam, a Firefox user would have to click on a link in an e-mail that pointed to a spoofed Web site and then download malicious software from the site, which would appear to be downloaded from a legitimate site.
This flaw was given a severity rating of two out of a possible five by Secunia.
David Emm, a senior technology consultant at antivirus company Kaspersky Labs, said that phishers aren't likely to take advantage of this flaw in Firefox, because Microsoft's Internet Explorer still dominates the browser market.
"I think it's unlikely that we'll see hackers rush to exploit this vulnerability," Emm said. "After all, Firefox has a much, much smaller install base than IE, and it's likely that hackers will continue to pay more attention to (IE) instead."
This may change in the future as Firefox has attracted a lot of interest in the past few months. A survey at the end of November found that Mozilla-based software, including Firefox, accounted for 7.4 percent of browsers in November 2004, up 5 percent from May.
The download vulnerability has been confirmed in Mozilla 1.7.3 for Linux, Mozilla 1.7.5 for Windows, and Mozilla Firefox 1.0. No solution is available at present, but Mozilla developers are expected to fix this bug in an upcoming version of the product.
The Secunia advisory and Mozilla bug report are available online.
Ingrid Marson of ZDNet UK reported from London.
See more CNET content tagged:
flaw, phishing, Mozilla Corp., Firefox, hacker






I can't believe CNET actually ran this story.
Firefox is MORE secure then IE, not perfectly secure. How hard is that to grasp? The fact that a flaw showed up in FF is news. When IE flaws show up, that just signifies that it is a different day but same crap as yesterday.
~Firefox takes almost double the time IE takes to open
~Firefox doesn't load pages as fast as IE as well as slower picture loading.
~Firefox has a tendency to replace the current page your using with a different page when you click on a link outside of the browser instead of just opening up a new window.
So I left Firefox. I had two choices:
The cheese with the holes that tasted really good
VS
The cheese that was whole but didn't taste good.
And personally, I prefer Swiss.
JC
The argument seems to imply that Microsoft has created a web browser analogous to a piece of swiss cheese that any competent programmer would never create and Firefox has been designed by sensible programmers who actually know how to do their job. Why would Bill Gates not take whatever share of his wealth he needed to and hire these wonder persons away to work for him to secure the cash flow of browsing the internet that is the very life blood of Microsoft? I struggle to find a solution to that question each time I see someone claiming that Firefox is a better/more secure web browser then IE. Why Bill!? Why do you not hire geniuses such as these to design IE!?
The answer is not all that difficult to find. First off, the programmers who developed Firefox are not better in general, and likely not as good in general. The question then becomes if this is the case, why does Firefox currently seem to be a more secure web browser? The answer to this is also relatively simple. Getting past any competent web browsers security is not a task that is easily done by anyone without an expertise in such things and takes a great deal of time and effort to accomplish. The fact is that for a very very long time, in terms of the life of the internet and web browsers, the only significant or worthwhile target has been IE, and as such has faced virtually the full brunt of interested hackers who are looking to leave a mark.
As Firefox, or any other browser for that matter, gains popularity the hackers will take an interest, and you can rest assured that their attention will reveal flaws as significant or even more so in these new entries to the browser market. Will they have the team/time/money/drive as significant that Microsoft currently has to plug these holes that will inevitably show up? Will these flaws yet to be revealed get attention as quickly or slower then IE security flaws have had, or will weeks, or months go by before they are updated and cured? Will the cures actually work? Will there come a day when hackers who have not been able to ?KILL? IE, decide to turn their full attention to a lesser browser that hasn?t had ten years of security development to keep it up and running, to try for a virtual death blow to one of the under developed newcomers? Do you want to be using that browser on that day?
Firefox has just started down a very long road. Lets wait and see if it can stay on the road at the first corner before we declare it has won the race.
- User Failure
- by January 24, 2005 11:54 AM PST
- The only security flaw involved in Phishing is with users themselves...anyone stupid enough to fall for these e-mail shouldn't be worried about their browser security...they probably leave the car running and unlocked with the diamond ring sitting on the dash
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