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UPDATED with response from Apple, and with news that patch is available.
Apple's new macOS 10.13 High Sierra is only a day old, and it's already been hacked.
A rogue application or other service running on a Mac can easily break into Apple's Keychain password vault and steal all user credentials stored therein, said security researcher Patrick Wardle.
'I'm continually disappointed in the security of macOS,' Wardle told both Ars Technica and ZDNet. 'Every time I look at macOS the wrong way, something falls over.'
Avast 2017 free download - Avast Free Mac Security, Avast Passwords, Avast SecureLine VPN, and many more programs. Best Video Software for the Mac How To Run MacOS High Sierra or Another OS on. The current tests of antivirus software for macOS High Sierra from June 2018 of AV-TEST, the leading international and independent service provider for antivirus software and malware.
To prevent such attacks, users will have to disable Keychain from automatically unlocking whenever they log into their Macs. On the bright side, Wardle has not disclosed exactly how his attack works, and there's no malware in the wild that's known to use this technique.
MORE: Best Mac Antivirus Software
How to Protect Yourself
Not upgrading to macOS 10.13 High Sierra won't keep you safe from this sort of attack. Wardle said on his blog that the flaw also exists in macOS 10.12 Sierra, and probably on OS X 10.11 El Capitan as well.
What you can do instead is to change the Keychain settings so that Keychain is not automatically unlocked when you log into your Mac. You'll have to log in every time Keychain needs to be accessed, which will be inconvenient, until Apple patches this flaw.
A video Wardle posted yesterday (Sept. 25) shows his proof-of-concept malware, called 'KeychainStealer,' installing on a Mac running High Sierra.
Wardle then scans the machine using the open-source networking utility Netcat, entering a command, and grabbing his own (presumably temporary) passwords for Facebook ('hunter2'), Twitter ('I_do_this_for_followers') and Bank of America ('ShowMeTheMoney$$$').
'As my discovery of this bug and report (in early September) was 'shortly' before High Sierra's release, this did not give Apple enough time to release a patch on time,' Wardle explained in a blog posting this morning (Sept. 26) 'However, my understanding is a patch will be forthcoming!'
How Keychain works
Mac applications normally can access only their own information in the Keychain, which besides passwords can hold any kind of sensitive information, such as credit-card numbers. Wardle's malware completely bypasses that process.
'Random apps should not be able to access the entire keychain and dump things like plaintext passwords,' Wardle wrote on his blog.
Wardle, whose day job is as director of research at Redwood City, California, security firm Synack, didn't get into technical details about how he pulled off the attack. But this isn't the first time he's shown Mac security to be lacking.
'Apple marketing has done a great job convincing people that macOS is secure,' Wardle told ZDNet. 'I think that this is rather irresponsible and leads to issues where Mac users are overconfident and thus more vulnerable.'
The silver lining here is that a random hacker cannot simply log into your Mac from afar and steal your passwords. Rather, the hacker must get you to agree to install the malware, which would probably be masquerading as something else.
You may think 'I'm too smart to fall for that.' But online criminals know how to fool people by using fake software updates, or, as evidenced by the CCleaner hack just last week, by sneaking malware into legitimate software updates at the source.
Last year, Wardle himself showed how a well-known antivirus product could be exploited to distribute Mac malware.
Apple's solution won't work
Apple has not responded to an email sent by Tom's Guide requesting comment.
However, Apple provided this statement to Ars Technica and to CNET: 'MacOS is designed to be secure by default, and Gatekeeper warns users against installing unsigned apps, like the one shown in this proof of concept, and prevents them from launching the app without explicit approval. We encourage users to download software only from trusted sources like the Mac App Store and to pay careful attention to security dialogs that macOS presents.'
The problem is that Gatekeeper doesn't work very well at keeping out malware, as Wardle and other Mac security researchers have shown time and time again. All Gatekeeper does is check to see whether a new piece of software has been 'signed' with a valid Apple developer ID — and anyone can get an Apple developer ID with an email address and $99.
Wardle deliberately didn't sign KeychainStealer with an Apple developer ID because he 'merely wanted to show how low the bar was/is set,' he explained on his blog.
'Essentially any malicious code can perform this attack,' Wardle added. 'Yes, this includes signed apps as well!'
UPDATE: Apple responded to our query with the same statement it provided to Ars Technica and CNET, reproduced in full above.
UPDATE Oct. 6: Apple has patched this flaw with the macOS 10.13 Supplemental Update, which also fixes a different password-revealing bug.
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I tried it but now it looks it does not offer for free and you have to pay after 30 day trial. Due to this, I recalled I used to have a ClamXav (free). Free antivirus for mac 10.7.5. So I use this 30 day trial to scam my Mac.
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Avast For Mac Sierra 2017 Route
To install Avast Security or Avast Premium Security (previously Avast Security Pro), follow the instructions below:
Before you begin the installation, ensure all other programs and internet browsers are closed, and any previous antivirus software is uninstalled.
Install Avast Security
- Download the Avast Security for Mac setup file by clicking the button below. Download Avast Security for Mac
- Double-click the downloaded setup file
avast_security_online.dmg
(by default, in your downloads folder). - Double-click Avast Security.
- Click Continue to determine if Avast Security can be installed.
- Click Continue.
- Click Continue to confirm that you have read the Avast End User License Agreement.
- Click Agree to confirm that you accept the terms.
- Click Install. Alternatively, if you would like to make changes to the default setup, click Change Install Location.. or Customize.
- If prompted, use your Touch ID to grant permission for the installation, or click Use Password.., then enter your Administrator password and click Install Software.
- Click Close.
If a System Extension Blocked notification appears, refer to the following article:
Avast Security is installed on your Mac. To start using Avast Security, click Continue With Free. If you have purchased a subscription for Avast Premium Security (previously Avast Security Pro), refer to the following article for detailed activation instructions:
- Avast Security 14.x for Mac
- Avast Premium Security 14.x for Mac
- Apple macOS 10.14.x (Mojave)
- Apple macOS 10.13.x (High Sierra)
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- Apple Mac OS X 10.10.x (Yosemite)