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CVE-2019-8460

Date: August 26, 2019

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.

Language: C

Severity Score

Related Resources (7)

https://security.netapp.com/advisory/ntap-20190905-0001/
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://us-cert.cisa.gov/ics/advisories/icsa-19-253-03
https://nvd.nist.gov/vuln/detail/CVE-2019-8460
https://www.mend.io/vulnerability-database/CVE-2019-8460

Severity Score

Weakness Type (CWE)

Excessive Data Query Operations in a Large Data Table

CWE-1049

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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