Vulnerability Details CVE-2019-8460
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.007
EPSS Ranking 70.5%
CVSS Severity
CVSS v3 Score 7.5
CVSS v2 Score 5.0
References
- 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/
- https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03
- 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/
- https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03
Products affected by CVE-2019-8460
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cpe:2.3:o:openbsd:openbsd:-
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cpe:2.3:o:openbsd:openbsd:2.0
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cpe:2.3:o:openbsd:openbsd:2.1
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cpe:2.3:o:openbsd:openbsd:2.2
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cpe:2.3:o:openbsd:openbsd:2.3
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cpe:2.3:o:openbsd:openbsd:2.4
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cpe:2.3:o:openbsd:openbsd:2.5
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cpe:2.3:o:openbsd:openbsd:2.6
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cpe:2.3:o:openbsd:openbsd:2.7
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cpe:2.3:o:openbsd:openbsd:2.8
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cpe:2.3:o:openbsd:openbsd:2.9
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cpe:2.3:o:openbsd:openbsd:3.0
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cpe:2.3:o:openbsd:openbsd:3.1
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cpe:2.3:o:openbsd:openbsd:3.2
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cpe:2.3:o:openbsd:openbsd:3.3
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cpe:2.3:o:openbsd:openbsd:3.4
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cpe:2.3:o:openbsd:openbsd:3.5
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cpe:2.3:o:openbsd:openbsd:3.6
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cpe:2.3:o:openbsd:openbsd:3.7
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cpe:2.3:o:openbsd:openbsd:3.8
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cpe:2.3:o:openbsd:openbsd:3.9
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cpe:2.3:o:openbsd:openbsd:4.0
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cpe:2.3:o:openbsd:openbsd:4.1
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cpe:2.3:o:openbsd:openbsd:4.2
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cpe:2.3:o:openbsd:openbsd:4.3
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cpe:2.3:o:openbsd:openbsd:4.4
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cpe:2.3:o:openbsd:openbsd:4.5
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cpe:2.3:o:openbsd:openbsd:4.6
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cpe:2.3:o:openbsd:openbsd:4.7
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cpe:2.3:o:openbsd:openbsd:4.8
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cpe:2.3:o:openbsd:openbsd:4.9
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cpe:2.3:o:openbsd:openbsd:5.0
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cpe:2.3:o:openbsd:openbsd:5.1
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cpe:2.3:o:openbsd:openbsd:5.2
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cpe:2.3:o:openbsd:openbsd:5.3
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cpe:2.3:o:openbsd:openbsd:5.4
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cpe:2.3:o:openbsd:openbsd:5.5
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cpe:2.3:o:openbsd:openbsd:5.6
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cpe:2.3:o:openbsd:openbsd:5.7
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cpe:2.3:o:openbsd:openbsd:5.8
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cpe:2.3:o:openbsd:openbsd:5.9
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cpe:2.3:o:openbsd:openbsd:6.0
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cpe:2.3:o:openbsd:openbsd:6.1
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cpe:2.3:o:openbsd:openbsd:6.2
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cpe:2.3:o:openbsd:openbsd:6.3
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cpe:2.3:o:openbsd:openbsd:6.4
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cpe:2.3:o:openbsd:openbsd:6.5