CVE-2023-41991

CVE Published	2023-09-21
Related CWE(s)	CWE-295: Improper Certificate Validation
Related Vendor(s)	apple
Related Product(s)	ipados, iphone_os, macos
Exploitation Reported (CISA KEV)	2023-09-25
CVSS 3 Base Score	5.5 (MEDIUM)
CVSS 3 Attack Complexity	LOW
CVSS 3 Attack Vector	LOCAL

A certificate validation issue was addressed. This issue is fixed in macOS Ventura 13.6, iOS 16.7 and iPadOS 16.7. 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.

Cyber Threat Graph Context

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Threat Reports Related to CVE-2023-41991

Report

We're All in this Together - A Year in Review of Zero-Days Exploited In-the-Wild in 2023

This report from Mandiant and Google Threat Analysis Group (TAG) presents combined analysis of zero day vulnerability exploitation in 2023. The ...

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Associated CAPEC Patterns

Creating a Rogue Certification Authority Certificate (CAPEC-459)

An adversary exploits a weakness resulting from using a hashing algorithm with weak collision resistance to generate certificate signing requests (CSR) that contain collision blocks in their "to be signed" parts. The adversary submits one CSR to be signed by a trusted certificate authority then uses the signed blob to make a second certificate appear signed by said certificate authority. Due to the hash collision, both certificates, though different, hash to the same value and so the signed blob works just as well in the second certificate. The net effect is that the adversary's second X.509 certificate, which the Certification Authority has never seen, is now signed and validated by that Certification Authority.

Signature Spoofing by Improper Validation (CAPEC-475)

An adversary exploits a cryptographic weakness in the signature verification algorithm implementation to generate a valid signature without knowing the key.

References