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Vulnerability of OpenBSD: denial of service via TCP SACK Holes Chains

Synthesis of the vulnerability 

An attacker can trigger a fatal error via TCP SACK Holes Chains of OpenBSD, in order to trigger a denial of service.
Vulnerable products: Data ONTAP 7-Mode, OpenBSD.
Severity of this weakness: 2/4.
Creation date: 25/07/2019.
Références of this bulletin: CVE-2019-8460, NTAP-20190905-0001, VIGILANCE-VUL-29880.

Description of the vulnerability 

An attacker can trigger a fatal error via TCP SACK Holes Chains of OpenBSD, in order to trigger a denial of service.
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This vulnerability bulletin impacts software or systems such as Data ONTAP 7-Mode, OpenBSD.

Our Vigil@nce team determined that the severity of this security note is medium.

The trust level is of type confirmed by the editor, with an origin of internet client.

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

Solutions for this threat 

OpenBSD: patch for TCP SACK Holes Chains.
A patch is available:
  https://ftp.openbsd.org/pub/OpenBSD/patches/6.4/common/019_tcpsack.patch.sig
  https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig
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