HTTP: Suricata TCP Handshake Content Detection Bypass
This signature detects attempts to exploit a known vulnerability against Suricata IDS/IPS. Successful exploitation could result in a bypass of security policies.
Extended Description
Suricata 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.
Affected Products
Suricata-ids suricata
Short Name
HTTP:STC:CVE-2018-6794
Severity
Minor
Recommended
True
Recommended Action
Drop
Category
HTTP
Keywords
Bypass CVE-2018-6794 Content Detection Handshake Suricata TCP
Release Date
04/17/2018
Supported Platforms
srx-branch-12.3
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-branch-19.4
vsrx-19.4
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx3bsd-19.4
srx-19.4
vsrx-12.3
vmx-19.3
vsrx-19.2
srx-12.3
Sigpack Version
3590
False Positive
Unknown
Vendors
Suricata-ids
Debian
CVSS Score
5.0