CVE-2018-6794: Medium severity Suricata-ids Suricata vulnerability
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 Software
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Frequently Asked Questions
What is the vulnerability ID for this vulnerability?
The vulnerability ID for this vulnerability is CVE-2018-6794.
What is the severity of CVE-2018-6794?
The severity of CVE-2018-6794 is medium, with a severity value of 5.3.
Which software versions are affected by CVE-2018-6794?
Suricata versions up to and exclusive of 4.0.4 and Debian Linux version 8.0 are affected by CVE-2018-6794.
How can the HTTP detection bypass vulnerability in Suricata be exploited?
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.
How can I fix CVE-2018-6794?
To fix CVE-2018-6794, update Suricata to version 4.0.4 or higher and update Debian Linux to a version higher than 8.0.