Description
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.
References (5)
Core 5
Core References
Third Party Advisory x_refsource_misc
https://redmine.openinfosecfoundation.org/issues/3286
Patch, Third Party Advisory x_refsource_confirm
https://github.com/OISF/suricata/commit/9f0294fadca3dcc18c919424242a41e01f3e8318
Third Party Advisory x_refsource_misc
https://redmine.openinfosecfoundation.org/issues/3395
Patch, Third Party Advisory x_refsource_confirm
https://github.com/OISF/suricata/commit/ea0659de7640cf6a51de5bbd1dbbb0414e4623a0
Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2020/01/msg00032.html
Scores
CVSS v3
7.5
EPSS
0.0025
EPSS Percentile
48.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Details
Status
published
Products (2)
debian/debian_linux
8.0
oisf/suricata
5.0.0
Published
Jan 06, 2020
Tracked Since
Feb 18, 2026