CVE-2019-8460 Information

Description

OpenBSD kernel version = 6.5 can be forced to create long chains of TCP SACK holes that causes very expensive calls to tcp_sack_option() for every incoming SACK packet which can lead to a denial of service.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/ https://security.netapp.com/advisory/ntap-20190905-0001/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5