Vulnerability Monitor

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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.

Published

2019-08-26T20:15:10.030

Last Modified

2024-11-21T04:49:56.840

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Secondary
CWE-1049
Type: Primary
NVD-CWE-Other

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	openbsd	openbsd	≤ 6.5	Yes

References

https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig Exploit, Vendor Advisory ([email protected])
https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f Patch, Third Party Advisory ([email protected])
https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/ Exploit, Patch, Press/Media Coverage, Third Party Advisory ([email protected])
https://security.netapp.com/advisory/ntap-20190905-0001/ Third Party Advisory ([email protected])
https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03 ([email protected])
https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig Exploit, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/ Exploit, Patch, Press/Media Coverage, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20190905-0001/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03 (af854a3a-2127-422b-91ae-364da2661108)