CVE-2019-18625

Published: 6 January 2020

An issue was discovered in Suricata 5.0.0. It was possible to bypass/evade any tcp based signature by faking a closed TCP session using an evil server. After the TCP SYN packet, it is possible to inject a RST ACK and a FIN ACK packet with a bad TCP Timestamp option. The client will ignore the RST ACK and the FIN ACK packets because of the bad TCP Timestamp option. Both linux and windows client are ignoring the injected packets.

Priority

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package	Release	Status
suricata Launchpad, Ubuntu, Debian	bionic	Needs triage
	disco	Ignored (end of life)
	eoan	Ignored (end of life)
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	impish	Does not exist
	jammy	Not vulnerable
	kinetic	Not vulnerable
	lunar	Not vulnerable
	mantic	Not vulnerable
	noble	Not vulnerable
	trusty	Does not exist
	upstream	Needs triage
	xenial	Needs triage

Severity score breakdown

Parameter	Value
Base score	7.5
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

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