CVE-2019-18625: 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…

PriorityP341high7.5CVSS 3.1

AVNACLPRNUINSUCNIHAN

EPSS

1.71%

74.4th percentile

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.

Affected

7 ranges

Vendor	Product	Version range	Fixed in
debian	debian_linux	—	—
debian	suricata	< suricata 1:5.0.2-1 (bookworm)	suricata 1:5.0.2-1 (bookworm)
oisf	suricata	—	—
oisf	suricata	>= 0 < 1:5.0.2-1	1:5.0.2-1
oisf	suricata	>= 0 < 1:5.0.2-1	1:5.0.2-1
oisf	suricata	>= 0 < 1:5.0.2-1	1:5.0.2-1
oisf	suricata	>= 0 < 1:5.0.2-1	1:5.0.2-1

CVSS provenance

nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:N/I:P/A:N

osv7.5HIGH

vendor_debian7.5HIGH

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