Detections
Analytics
CVE-2019-18625
high
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
https://redmine.openinfosecfoundation.org/issues/3395
https://redmine.openinfosecfoundation.org/issues/3286
https://lists.debian.org/debian-lts-announce/2020/01/msg00032.html
https://github.com/OISF/suricata/commit/ea0659de7640cf6a51de5bbd1dbbb0414e4623a0
https://github.com/OISF/suricata/commit/9f0294fadca3dcc18c919424242a41e01f3e8318