Firefox Blocks Flash By Default To Protect Against Fresh ‘Critical’ Vulnerabilities

Firefox now blocks Adobe Flash by default following the discovery of yet more zero-day vulnerabilities in the browser plug-in.

Two ‘critical’ flaws (CVE-2015-5122 and CVE-2015-5123) have been uncovered in files retrieved during the attack on controversial surveillance tools developer Hacking Team and have yet to be patched by Adobe, which expects to make updates available later this week.

Mark Schmidt, head of Firefox support at Mozilla, announced on Twitter that all versions of Flash were now blocked by the browser until a fix is made available.

Firefox Flash block

“BIG NEWS!! All versions of Flash are blocked by default in Firefox as of now,” he said in a Tweet accompanied by an ‘occupy Flash’ image (left). “To be clear, Flash is only blocked until Adobe releases a version which isn’t being actively exploited by publicly known vulnerabilities.”

Mozilla says it routinely blocks add-ons, plugins, or other third-party software that “seriously compromises Firefox security, stability, or performance” when it becomes aware of them. Its block relates specifically to CVE-2015-5122.

Security firm TrendMicro says that at present the vulnerability is just a ‘proof of concept’ and has yet to see it exploited in the wild. If exploited, an attacker could engineer a crash and take control of the affected system.

Adobe’s promised fixes will be the 37th and 38th for the month of July so far, with an update last week fixing 36 flaws, including another vulnerability (CVE-2015-5119) discovered in 400GB worth of internal Hacking Team documents.

Are you a security pro? Try our quiz!

Steve McCaskill

Steve McCaskill is editor of TechWeekEurope and ChannelBiz. He joined as a reporter in 2011 and covers all areas of IT, with a particular interest in telecommunications, mobile and networking, along with sports technology.

View Comments

  • I have to admit when I first read about this, one of the first things that comes to mind is a couple of years back when Steve Jobs wrote a "rant" about the many downsides of Flash and how it's time to move on. Hopefully this gets resolved quickly.

Recent Posts

Australia Rejects Elon Musk Claim About Social Media Ban For Under-16s

Government minister flatly rejects Elon Musk's “unsurprising” allegation that Australian government seeks control of Internet…

39 mins ago

Northvolt Files For Bankruptcy Protection In US

Northvolt files for Chapter 11 bankruptcy protection in the United States, and CEO and co-founder…

2 hours ago

UK’s CMA Readies Cloud Sector “Behavioural” Remedies – Report

Targetting AWS, Microsoft? British competition regulator soon to announce “behavioural” remedies for cloud sector

18 hours ago

Former Policy Boss At X Nick Pickles, Joins Sam Altman Venture

Move to Elon Musk rival. Former senior executive at X joins Sam Altman's venture formerly…

20 hours ago

Bitcoin Rises Above $96,000 Amid Trump Optimism

Bitcoin price rises towards $100,000, amid investor optimism of friendlier US regulatory landscape under Donald…

21 hours ago

FTX Co-Founder Gary Wang Spared Prison

Judge Kaplan praises former FTX CTO Gary Wang for his co-operation against Sam Bankman-Fried during…

22 hours ago