CVE-2019-18625

NameCVE-2019-18625
DescriptionAn 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
suricata (PTS)jessie2.0.7-2+deb8u1vulnerable
jessie (security)2.0.7-2+deb8u4vulnerable
stretch3.2.1-1+deb9u1vulnerable
buster1:4.1.2-2vulnerable
bullseye, sid1:4.1.5-2vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
suricatasource(unstable)(unfixed)

Notes

https://github.com/OISF/suricata/commit/9f0294fadca3dcc18c919424242a41e01f3e8318 (suricata-5.0.1)
https://github.com/OISF/suricata/commit/ea0659de7640cf6a51de5bbd1dbbb0414e4623a0 (master-4.1.x)
https://redmine.openinfosecfoundation.org/issues/3286
https://redmine.openinfosecfoundation.org/issues/3395

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