Apple Patches Three New 0-Day Vulnerabilities Affecting iOS/iPadOS/watchOS/macOS, (Thu, Sep 21st)

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This update patches three already exploited vulnerabilities:
(1) CVE-2023-41993 Remote code execution in WebKit. This could be used as an initial access vector
(2) CVE-2023-41992 Privilege Escalation. A follow-up after the initial access was achieved via the first vulnerability
(3) CVE-2023-41991 Certificate Validation Issue. A malicious app installed via 1 and 2 may be more difficult to detect due to this vulnerability

Patches are available for all currently supported operating systems and Safari to address the WebKit vulnerability.

iOS 17 (just released this week), as well as iOS 16, is vulnerable.

CVSS numbers below are not "official" but generated with some help from ChatGPT based on the vulnerability description. Used them as rough indicators of severity.

Safari 16.6.1 iOS 17.0.1 and iPadOS 17.0.1 iOS 16.7 and iPadOS 16.7 watchOS 10.0.1 watchOS 9.6.3 macOS Ventura 13.6 macOS Monterey 12.7
CVE-2023-41993 [critical] ChatGPT-CVSS: CVSS score: 9.8 *** EXPLOITED *** WebKit
The issue was addressed with improved checks.
Processing web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited against versions of iOS before iOS 16.7.
x x x     x  
CVE-2023-41992 [moderate] ChatGPT-CVSS: 7.0. *** EXPLOITED *** Kernel
The issue was addressed with improved checks.
A local attacker may be able to elevate their privileges. Apple is aware of a report that this issue may have been actively exploited against versions of iOS before iOS 16.7.
  x x x x x x
CVE-2023-41991 [important] ChatGPT-CVSS: 7.0 *** EXPLOITED *** Security
A certificate validation issue was addressed.
A malicious app may be able to bypass signature validation. Apple is aware of a report that this issue may have been actively exploited against versions of iOS before iOS 16.7.
  x x x x x  


Johannes B. Ullrich, Ph.D. , Dean of Research, SANS.edu
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(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.

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