Apple Safari up to 12.0 WebKit memory corruption

Summaryinfo

A vulnerability described as critical has been identified in Apple Safari up to 12.0. The affected element is an unknown function of the component WebKit. The manipulation results in memory corruption. This vulnerability is cataloged as CVE-2018-4376. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, was found in Apple Safari up to 12.0 (Web Browser). Affected is an unknown code block 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:

Multiple memory corruption issues were addressed with improved memory handling. This issue affected versions prior to iOS 12.1, watchOS 5.1, Safari 12.0.1, iTunes 12.9.1, iCloud for Windows 7.8.

The bug was discovered 10/30/2018. The weakness was shared 10/29/2018 by 010 as HT209196 as confirmed advisory (Website) via ZDI (Zero Day Initiative). The advisory is shared for download at support.apple.com. This vulnerability is traded as CVE-2018-4376 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 $0-$5k (estimation calculated on 04/08/2020). The advisory points out:

Multiple memory corruption issues were addressed with improved memory handling.

The vulnerability scanner Nessus provides a plugin with the ID 118571 (macOS : Apple Safari < 12.0.1 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 371294 (Apple iTunes for Windows Prior to 12.9.1 Multiple Vulnerabilities (HT209197)).

Upgrading to version 12.0.1 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 (118571). The entries VDB-126166, VDB-126170, VDB-126180 and VDB-126181 are related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Web Browser

Vendor

• Apple

Name

• Safari

Version

• 12.0

License

• commercial

Website

• Vendor: https://www.apple.com/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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