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Under those, revocations are performed by the CA most commonly at the request of the certificate owner, in this case HP. Security certificates provided to developers for signing macOS and other Apple platform apps come from Apple, as the Certificate Authority (CA), a very demanding responsibility which resides with a separate team within Apple, its PKI, operating under stringent rules. So who might have revoked those certificates?

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Errors aren’t consistent because they depend on where the signature is failing: if you try to open an app with a fatal signature problem, Gatekeeper will display that alert or (more brutally in Catalina) crash the app if an app tries to run a component with a fatal signature problem, that generates an internal error which the app may not communicate explicitly, and just report an error in that component.Ĭhecking the signatures on some of the affected software revealed that the certificate used to sign them had been revoked, presumably shortly before problems appeared on 23 October. These behaviours aren’t anything to do with MRT, whose purpose is to remove malware, or XProtect, which checks for signatures of known malware, but come from Gatekeeper, when it’s checking the signature on software being launched. Problems were most frequent in Mojave and Catalina, and with older HP printers.

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In some, there were what looked like regular errors with opaque numbers, and for Catalina users there were crash reports when macOS force-crashed HP software because the code signature is invalid. Not all users reported such characteristic errors, though. The most worrying of the alerts came from Gatekeeper, which warned that the printer software was malicious and “will damage your computer” and refused to run it. Symptoms were completely different: when trying to print or otherwise access some HP printers, various error messages appeared and access failed. Reports about problems with HP printers didn’t start appearing until 23 October, well after those users affected by MRT 1.68 had run into problems. There are several different and reliable ways of doing that, and if you’re uncertain please contact Apple Support so that they can talk you through resolution.

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Until then, you’ll need to follow a method which will remove 1.68 and either replace it with 1.67 from a backup, or allow Apple’s update servers to push 1.67 at it. The best will be when Apple pushes MRT 1.69, which should replace the buggy version at last. There are many different potential solutions for Macs which are affected by this bug.

#Mac os hp utility install

Because of the way that these updates are pushed, your Mac won’t see the older version, and even if it did, simply trying to install it won’t force it to be downgraded from 1.68 to 1.67. Apple pulled that update early on 24 October, but unfortunately that doesn’t force affected Macs to be downgraded. This appears to be the result of a bug in MRT 1.68. For the moment, if your Mac successfully updated to the new version of MRT without suffering these problems, there’s no reason to suspect that it will develop them later. It’s not clear why this is, and there’s no obvious pattern to these problems. Many Macs which were updated to MRT 1.68 haven’t been affected at all. Although affected Macs aren’t completely unusable, they’re severely affected by this.

MRT keeps crashing and being automatically restarted, and this affects overall performance. The Mac becomes sluggish, and looking in Activity Monitor normally shows two processes, MRT and trustd, taking large amounts of CPU. Affected Macs, which can be running any version of macOS from El Capitan to Catalina, suffer severe problems running the new version of MRT. Unlike XProtect, whose data files are used on demand, MRT is normally run in two situations: shortly after it has been updated, and soon after a Mac starts up. Some, but by no means all, Macs then suffered a problem as a result of the new version of MRT. That doesn’t happen immediately, but for Macs in daily use, that means that most will have been updated by 2359 UTC on 20 October.

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Macs which run with Software Update set to Install system data files and security updates then automatically download and install those updates. These normally happen every two weeks or so, and are silent in that Apple doesn’t announce them, or even admit that they’ve happened. Some time before 2200 UTC on Monday 19 October, Apple pushed routine updates to its security tools, XProtect and MRT.

This article explains what happened, and what you can do about them. Last week a great many Mac users were struck by one or both of two serious problems.