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Vulnerability of FreeBSD, XNU, iOS, macOS: use after free via IP6_EXTHDR_CHECK

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via IP6_EXTHDR_CHECK of FreeBSD, XNU, iOS and macOS, in order to trigger a denial of service, and possibly to run code.
Vulnerable systems: iOS by Apple, iPhone, Mac OS X, FreeBSD.
Severity of this threat: 2/4.
Creation date: 23/03/2021.
Références of this weakness: CVE-2020-9892, GHSA-gxcr-cw4q-9q78, HT211288, HT211289, VIGILANCE-VUL-34916.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via IP6_EXTHDR_CHECK of F...
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This threat bulletin impacts software or systems such as iOS by Apple, iPhone, Mac OS X, FreeBSD.

Our Vigil@nce team determined that the severity of this computer threat bulletin is medium.

The trust level is of type confirmed by the editor, with an origin of privileged shell.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a specialist ability can exploit this computer threat.

Solutions for this threat 

This vulnerability solution will be public soon.
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