Vulnerability CVE-2019-8460


Published: 2019-08-26   Modified: 2019-08-27

Description:
Reuven Plevinsky and Tal Vainshtein of Check Point Software Technologies Ltd. discovered that OpenBSD kernel (all versions, including 6.5) can be forced to create long chains of TCP SACK holes that cause very expensive calls to tcp_sack_option() for every incoming SACK packet which can lead to a denial of service.

Type:

CWE-20

(Improper Input Validation)

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Openbsd -> Openbsd 

 References:
https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig
https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f
https://security.netapp.com/advisory/ntap-20190905-0001/

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