Network Security, Patch/Configuration Management, Vulnerability Management

Mozilla patches exploited zero-day flaw in Firefox

January 9, 2020

The Mozilla Foundation yesterday issued a security update for Firefox and Firefox Extended Support Release, which were found to contain an actively exploited, critical vulnerability in the IonMonkey JIT compiler.

"Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion," reads an official advisory posted by Mozilla, citing the two elements as StoreElementHole and FallibleStoreElmenet. "We are aware of targeted attacks in the wild abusing this flaw."

Designated CVE-2019-17026, the zero-day bug was reported by researchers at Qihoo 360 ATA. The problem has been fixed with the release of Firefox 72.0.1 and Firefox ESR 68.4.1

Mozilla provided no further context on how the flaw has been exploited.

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Bradley Barth

As director of multimedia content strategy at CyberRisk Alliance, Bradley Barth develops content for online conferences, webcasts, podcasts video/multimedia projects — often serving as moderator or host. For nearly six years, he wrote and reported for SC Media as deputy editor and, before that, senior reporter. He was previously a program executive with the tech-focused PR firm Voxus. Past journalistic experience includes stints as business editor at Executive Technology, a staff writer at New York Sportscene and a freelance journalist covering travel and entertainment. In his spare time, Bradley also writes screenplays.

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