Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Vulnerabilities / Threats

Apple Patches Multiple Major Security Flaws

New security updates cross all Apple platforms.

Apple yesterday released security updates to deal with serious vulnerabilities in multiple products including a handful of "critical" flaws that should be patched immediately.

According to US-CERT, the patches released cover Safari 12.0.1, iCloud for Windows 7.8, iTunes 12.9.1, watchOS 5.1, iOS 12.1, tvOS 12.1, macOS Mojave 10.14.1, macOS Security Update 2018-001 High Sierra, and macOS Security Update 2018-005 Sierra. While the patched vulnerabilities are present in a wide variety of products, according to security researchers at Semmle, at least six of the critical vulnerabilities are within the XNU kernel that sits at the core of all current Apple operating systems.

In a post on the Semmle blog, researcher Kevin Backhouse described how he discovered the vulnerabilities using variant analysis to search for patterns in code. In an interview with Dark Reading, Oege de Moor, CEO and co-founder of Semmle, explained that the bugs fall into two categories: "The ICMP packet handler vulnerability is a classical heap buffer overflow. The second second category is the NFS client, and it's responsible for  five independent, but highly related, vulnerabilities."

de Moor says that Backhouse found the first of the NFS vulnerabilities through the sort of general code exploration common to threat researchers. Backhouse then used the discovered code to feed a variant analysis engine that ran on other operating systems and found the related vulnerabilities.

"In this case, it's a critical vulnerability, allowing an attacker to mount a malicious NFS volume and gain kernel-level privileges," says de Moor.

According to Semmle's findings, those kernel privileges could allow a malicious actor to read, write, and delete files on disk and in memory, install new applications, or wipe and reset the device to factory settings.

The five related NFS vulnerabilities were patched in macOS with this latest round of updates. The ICMP vulnerability doesn't grant the same depth of privilege, but it has a broader footprint and the possibility of easier exploitation.

Backhouse found a vulnerability in the ICMP packet-handling module in the XNU kernel. de Moor says the bug could be exploited through a classic buffer overflow technique and could allow an attacker to cause affected systems to reboot at arbitrary times. It was remediated in the latest releases of MacOS Sierra, High Sierra, and Mojave; and in iOS 12. It was not, de Moor says, patched for iOS 11, so the roughly 40% of iOS devices that have not (or cannot) upgrade to the latest operating system version are still vulnerable.

Team Effort

While Backhouse was responsible for finding nearly half of the vulnerabilities patched in the latest releases, other researchers also contributed to the vulnerability count.

Jake Massimo, of the University of London, discovered a flaw in the way that Apple implemented a check for prime numbers in its corecrypto module. In his blog post announcing the flaw, Massimo describes how the function can be spoofed into labeling a composite (or non-prime) number as prime, and through doing so render an encryption algorithm far more vulnerable to cracking. Massimo, with colleagues, has issued a full paper on the flaw, with details about the algorithm used to determine whether a number is prime and the effects of getting it wrong.

Apple includes details on all of the new updates on the Apple support site.

Related Content:

 

Black Hat Europe returns to London Dec 3-6 2018  with hands-on technical Trainings, cutting-edge Briefings, Arsenal open-source tool demonstrations, top-tier security solutions and service providers in the Business Hall. Click for information on the conference and to register.

Curtis Franklin Jr. is Senior Editor at Dark Reading. In this role he focuses on product and technology coverage for the publication. In addition he works on audio and video programming for Dark Reading and contributes to activities at Interop ITX, Black Hat, INsecurity, and ... View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Joe Stanganelli
50%
50%
Joe Stanganelli,
User Rank: Ninja
10/31/2018 | 11:17:22 PM
Security only, or security-plus?
The important question: Are these STRICTLY security-related updates? Or did they throw in feature changes too?

Because not only are users tired of that garbage, but it's precisely why they're patch-phobic and update-phobic to begin with! (My lengthier rant on the subject for a sister site here: securitynow.com/author.asp?section_id=706&doc_id=746324 )
SOC 2s & Third-Party Assessments: How to Prevent Them from Being Used in a Data Breach Lawsuit
Beth Burgin Waller, Chair, Cybersecurity & Data Privacy Practice , Woods Rogers PLC,  12/5/2019
Deliver a Deadly Counterpunch to Ransomware Attacks: 4 Steps
Mathew Newfield, Chief Information Security Officer at Unisys,  12/10/2019
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Write a Caption, Win a Starbucks Card! Click Here
Latest Comment: Our Endpoint Protection system is a little outdated... 
Current Issue
Navigating the Deluge of Security Data
In this Tech Digest, Dark Reading shares the experiences of some top security practitioners as they navigate volumes of security data. We examine some examples of how enterprises can cull this data to find the clues they need.
Flash Poll
Rethinking Enterprise Data Defense
Rethinking Enterprise Data Defense
Frustrated with recurring intrusions and breaches, cybersecurity professionals are questioning some of the industrys conventional wisdom. Heres a look at what theyre thinking about.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2019-19604
PUBLISHED: 2019-12-11
Arbitrary command execution is possible in Git before 2.20.2, 2.21.x before 2.21.1, 2.22.x before 2.22.2, 2.23.x before 2.23.1, and 2.24.x before 2.24.1 because a "git submodule update" operation can run commands found in the .gitmodules file of a malicious repository.
CVE-2019-14861
PUBLISHED: 2019-12-10
All Samba versions 4.x.x before 4.9.17, 4.10.x before 4.10.11 and 4.11.x before 4.11.3 have an issue, where the (poorly named) dnsserver RPC pipe provides administrative facilities to modify DNS records and zones. Samba, when acting as an AD DC, stores DNS records in LDAP. In AD, the default permiss...
CVE-2019-14870
PUBLISHED: 2019-12-10
All Samba versions 4.x.x before 4.9.17, 4.10.x before 4.10.11 and 4.11.x before 4.11.3 have an issue, where the S4U (MS-SFU) Kerberos delegation model includes a feature allowing for a subset of clients to be opted out of constrained delegation in any way, either S4U2Self or regular Kerberos authent...
CVE-2019-14889
PUBLISHED: 2019-12-10
A flaw was found with the libssh API function ssh_scp_new() in versions before 0.9.3 and before 0.8.8. When the libssh SCP client connects to a server, the scp command, which includes a user-provided path, is executed on the server-side. In case the library is used in a way where users can influence...
CVE-2019-1484
PUBLISHED: 2019-12-10
A remote code execution vulnerability exists when Microsoft Windows OLE fails to properly validate user input, aka 'Windows OLE Remote Code Execution Vulnerability'.