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Apple patches “0-day” browser bug fastened 2 weeks in the past in Chrome, Edge – Bare Safety


Apple has disgorged its newest patches, fixing greater than 50 CVE-numbered safety vulnerabilities in its vary of supported merchandise.

The related safety bulletins, replace numbers, and the place to search out them on-line are as follows:

  • APPLE-SA-2022-07-20-1: iOS 15.6 and iPadOS 15.6, particulars at HT213346
  • APPLE-SA-2022-07-20-2: macOS Monterey 12.5, particulars at HT213345
  • APPLE-SA-2022-07-20-3: macOS Large Sur 11.6.8, particulars at HT213344
  • APPLE-SA-2022-07-20-4: Safety Replace 2022-005 Catalina, particulars at HT213343
  • APPLE-SA-2022-07-20-5: tvOS 15.6, particulars at HT213342
  • APPLE-SA-2022-07-20-6: watchOS 8.7, particulars at HT213340
  • APPLE-SA-2022-07-20-7: Safari 15.6, particulars at HT213341

As traditional with Apple, the Safari browser patches are bundled into the updates for the most recent macOS (Monterey), in addition to into the updates for iOS and iPad OS.

However the updates for the older variations of macOS don’t embrace Safari, so the standalone Safari replace (see HT213341 above) due to this fact applies to customers of earlier macOS variations (each Large Sur and Catalina are nonetheless formally supported), who might want to obtain and set up two updates, not only one.

An honorary zero-day

By the best way, in case you’ve received a Mac with an earlier model of macOS, don’t neglect about that second obtain for Safari, as a result of it’s vitally vital, at the very least so far as we will see.

That’s as a result of one of many browser-related patches on this spherical of updates offers with a vulnerability in WebRTC (internet real-time communications) often known as CVE-2022-2294

…and if that quantity sounds acquainted, it ought to, as a result of it’s the identical bug that was fastened as a zero-day by Google in Chrome (and by Microsoft in Edge) about two weeks in the past:

Intriguingly, Apple hasn’t declared any of this month’s vulnerabilities as “reported to be within the wild”, or as “zero-day bugs”, regardless of the abovementioned patch that was dubbed a zero-day gap by Google.

Whether or not that’s as a result of the bug isn’t as straightforward to take advantage of in Safari, or just because nobody has traced again any Safari-specific misbehaviour to this specific flaw, we will’t inform you, however we’re treating it as an “honorary zero-day” vulnerability, and patching zealously consequently.

Pwn2Own gap closed

Apple has additionally apparently fastened the bug discovered by German cybersecurity researcher Manfred Paul on the latest Pwn2Own competitors in Canada, again in Could 2022.

Manfred Paul exploited Firefox with a two-stage bug that earned him $100,000 ($50,000 for every half), and received into Safari as effectively, for an extra $50,000 bounty.

Certainly, Mozilla printed its repair for Paul’s bugs inside two days of receiving his report at Pwn2Own:

Apple, in distinction, took two months to ship its post-Pwn2Own patch:

WebKit

Impression: Processing maliciously crafted internet content material could result in arbitrary code execution

Description: An out-of-bounds write situation was addressed with improved enter validation.

CVE-2022-32792: Manfred Paul (@_manfp) working with Pattern Micro Zero Day Initiative [Pwn2Own]

Keep in mind, nonetheless, that accountable disclosure is a part of the Pwn2Own competitors, which means that anybody claiming a prize is required not solely at hand over full particulars of their exploit to the affected vendor, but in addition to maintain quiet concerning the vulnerabiity till the patch is out.

In different phrases, as laudable and thrilling as Mozilla’s two-day patch supply time could have been, Apple’s a lot slower response is nonetheless acceptable.

The stay video streams you could have seen from Pwn2Own served to point whether or not every competitor’s assault succeeded, quite than to disclose any details about how the assault really labored. The video shows utilized by the rivals had their backs to the digicam, so you could possibly see the faces of the rivals and adjudicators, however not what they have been typing or taking a look at.

Multi-stage assaults

As traditional, the quite a few bugs patched by Apple in these updates embrace vulnerabilities that would, in concept, be chained collectively by decided attackers.

A bug listed with the proviso that “an app with root privileges could possibly execute arbitrary code with kernel privileges” doesn’t sound terribly worrying at first.

In any case, if an attacker already has root powers, they’re just about in command of your laptop anyway.

However if you discover a bug elsewhere within the system that’s listed with the warning that “an app could possibly acquire root privileges”, you may see how the latter vulnerability could possibly be a handy and unauthorised stepping stone to the previous.

And if you additionally discover a picture rendering bug described as “processing a maliciously crafted file could result in arbitrary code execution”, you may shortly see that:

  • A booby-trapped internet web page might include a picture that launches untrusted code.
  • That untrusted code might implant a low-privilege app.
  • The undesirable app might purchase root powers for itself.
  • The now-root app might inject its personal rogue code into the kernel.

In different phrases, theoretically at the very least, simply taking a look at an apparently harmless web site…

…might ship you tumbling right into a cascade of hassle, identical to the well-known saying that goes, “For need of a nail, the shoe was misplaced; for need of a shoe, the horse was misplaced; for need of a horse, the message was misplaced; for need of a message, the battle was misplaced… all for the need of a horseshoe nail.”

What to do?

That’s why, as at all times, we advocate that you just patch early; patch typically; patch every little thing.

Apple, to its credit score, makes patching every little thing the default: you don’t get to decide on which patches to deploy and which to go away “for later”.

The one exception to this rule, as we famous above, is that for macOS Large Sur and macOS Catalina, you’ll obtain the majority of the working system updates in a single big obtain, adopted by a separate download-and-update course of to put in the most recent model of Safari.

As traditional:

  • In your iPhone or iPad: Settings > Normal > Software program Replace
  • In your Mac: Apple menu > About this Mac > Software program Replace…



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