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Thursday, 20 June 2019 09:07

Patch issued for critical Firefox flaw under attack

Patch issued for critical Firefox flaw under attack Pixabay

The Mozilla Foundation has issued a fix for a critical bug in Firefox and Firefox ESR that affects users on Windows, macOS and Linux desktops. It says the bug is being exploited in the wild.

The bug was discovered by Samuel Groß of Google's Project Zero and the cryptocurrency site Coinbase.

The Mozilla advisory said a type confusion flaw could occur when using JavaScript objects due to issues in the Array.pop command that would lead to a crash that was exploitable.

Groß said on Twitter that the bug could be exploited for remote code execution, but it would then need a separate sandbox escape.

He added: “However, most likely it can also be exploited for UXSS (universal cross-site scripting) which might be enough, depending on the attacker’s goals.”

Philip Martin, a security engineer from Coinbase, said the company had detected and blocked an attempt by an attacker to use the bug, along with a separate zero-day Firefox sandbox escape, to target its employees.

"We walked back the entire attack, recovered and reported the 0-day to Firefox, pulled apart the malware and infra used in the attack and are working with various orgs to continue burning down attacker infrastructure and digging into the attacker involved," he said.

"We’ve seen no evidence of exploitation targeting customers. We were not the only crypto org targeted in this campaign. We are working to notify other orgs we believe were also targeted. We’re also releasing a set of IOCs that orgs can use to evaluate their potential exposure."

Groß said he had no details about the active exploitation claimed to be taking place.

The issue has been fixed in Firefox 67.0.3 and Firefox ESR 60.7.1.


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Sam Varghese

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Sam Varghese has been writing for iTWire since 2006, a year after the site came into existence. For nearly a decade thereafter, he wrote mostly about free and open source software, based on his own use of this genre of software. Since May 2016, he has been writing across many areas of technology. He has been a journalist for nearly 40 years in India (Indian Express and Deccan Herald), the UAE (Khaleej Times) and Australia (Daily Commercial News (now defunct) and The Age). His personal blog is titled Irregular Expression.



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