Apple iOS up to 11.4.0 WebKit memory corruption

Summaryinfo

A vulnerability categorized as critical has been discovered in Apple iOS up to 11.4.0. The impacted element is an unknown function of the component WebKit. The manipulation results in memory corruption. This vulnerability is identified as CVE-2018-4270. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Apple iOS up to 11.4.0 (Smartphone Operating System). Affected is an unknown functionality of the component WebKit. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A memory corruption issue was addressed with improved memory handling. This issue affected versions prior to iOS 11.4.1, tvOS 11.4.1, watchOS 4.3.2, Safari 11.1.2, iTunes 12.8 for Windows, iCloud for Windows 7.6.

The bug was discovered 07/09/2018. The weakness was released 07/09/2018 as HT208938 as confirmed advisory (Website). The advisory is shared for download at support.apple.com. This vulnerability is traded as CVE-2018-4270 since 01/02/2018. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 02/29/2020). It is expected to see the exploit prices for this product increasing in the near future. The advisory points out:

A memory corruption issue was addressed with improved memory handling.

The vulnerability scanner Nessus provides a plugin with the ID 111109 (macOS : Apple Safari < 11.1.2 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family MacOS X Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171580 (OpenSUSE Security Update for webkit2gtk3 (openSUSE-SU-2018:2781-1)).

Upgrading to version 11.4.1 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (111109). Entries connected to this vulnerability are available at VDB-120972, VDB-120960, VDB-120961 and VDB-120962. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Smartphone Operating System

Vendor

• Apple

Name

• iOS

Version

• 11.0
• 11.1
• 11.2
• 11.3
• 11.4.0

License

• commercial

Website

• Vendor: https://www.apple.com/

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Entryinfo

Once again VulDB remains the best source for vulnerability data.

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