WebKit Cross Site Scripting and Multiple Memory Corruption Vulnerabilities



Date Discovered

October 29, 2019


WebKit is prone to cross-site scripting and multiple memory-corruption vulnerabilities. Attackers can exploit these issues to execute arbitrary code on the affected system. Failed exploit attempts may result in a denial-of-service condition.

Technologies Affected

  • Apple Watch
  • Apple watchOS 1.0
  • Apple watchOS 1.0.1
  • Apple watchOS 10.1.1
  • Apple watchOS 12.4
  • Apple watchOS 2.0
  • Apple watchOS 2.0.1
  • Apple watchOS 2.1
  • Apple watchOS 2.2
  • Apple watchOS 2.2.1
  • Apple watchOS 2.2.2
  • Apple watchOS 3
  • Apple watchOS 3.0
  • Apple watchOS 3.1
  • Apple watchOS 3.1.1
  • Apple watchOS 3.1.3
  • Apple watchOS 3.2
  • Apple watchOS 3.2.1
  • Apple watchOS 3.2.2
  • Apple watchOS 3.2.3
  • Apple watchOS 4
  • Apple watchOS 4.1
  • Apple watchOS 4.2
  • Apple watchOS 4.2.2
  • Apple watchOS 4.2.3
  • Apple watchOS 4.3
  • Apple watchOS 4.3.1
  • Apple watchOS 4.3.2
  • Apple watchOS 5
  • Apple watchOS 5.1.2
  • Apple watchOS 5.1.3
  • Apple watchOS 5.2.1
  • Apple watchOS 5.3
  • WebKit Open Source Project WebKit


Run all software as a nonprivileged user with minimal access rights.
Ensure that all nonadministrative tasks, such as browsing the web and reading email, are performed as an unprivileged user with minimal access rights.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This may indicate exploit attempts or activity that results from a successful exploit.

Do not follow links provided by unknown or untrusted sources.
To reduce the likelihood of successful exploits, never visit sites of questionable integrity or follow links provided by unfamiliar or untrusted sources.

Implement multiple redundant layers of security.
Various memory-protection schemes (such as nonexecutable and randomly mapped memory segments) may hinder an attacker's ability to exploit memory corruption vulnerabilities.

Updates are available. Please see the references or vendor advisory for more information.



Sergei Glazunov of Google Project Zero, zhunki from Codesafe Team of Legendsec at Qi'anxin Group, Samuel Groß of Google Project Zero, OSS-Fuzz

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