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Vulnerability of OpenBSD ssh-keygen: NULL pointer dereference via a FIDO token

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced when using a FIDO token with OpenBSD ssh-keygen, in order to trigger a denial of service.
Vulnerable systems: OpenBSD.
Severity of this threat: 1/4.
Creation date: 19/05/2020.
Références of this weakness: VIGILANCE-VUL-32294.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced when using a FIDO token with OpenBSD ssh-keygen, in order to trigger a denial of service.
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This threat alert impacts software or systems such as OpenBSD.

Our Vigil@nce team determined that the severity of this computer vulnerability bulletin is low.

The trust level is of type confirmed by the editor, with an origin of physical access.

An attacker with a expert ability can exploit this weakness note.

Solutions for this threat 

OpenBSD: patch for ssh-keygen.
A patch is indicated in information sources.
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