CVE-2018-6794

NameCVE-2018-6794
DescriptionSuricata before 4.0.4 is prone to an HTTP detection bypass vulnerability in detect.c and stream-tcp.c. If a malicious server breaks a normal TCP flow and sends data before the 3-way handshake is complete, then the data sent by the malicious server will be accepted by web clients such as a web browser or Linux CLI utilities, but ignored by Suricata IDS signatures. This mostly affects IDS signatures for the HTTP protocol and TCP stream content; signatures for TCP packets will inspect such network traffic as usual.
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)
ReferencesDLA-1603-1
NVD severitymedium (attack range: remote)
Debian Bugs889842

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+deb8u3fixed
stretch3.2.1-1+deb9u1vulnerable
buster, sid1:4.0.6-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
suricatasource(unstable)1:4.0.4-1medium889842
suricatasourcejessie2.0.7-2+deb8u3mediumDLA-1603-1

Notes

[stretch] - suricata <no-dsa> (Minor issue)
[wheezy] - suricata <no-dsa> (Minor issue)
https://redmine.openinfosecfoundation.org/issues/2427
https://github.com/OISF/suricata/pull/3202/commits/e1ef57c848bbe4e567d5d4b66d346a742e3f77a1

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