CVE-2018-6794

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.

CVSS v3.0 NVD

5.3 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v2.0 NVD

5.0 MEDIUMAV:N/AC:L/Au:N/C:N/I:P/A:N

EPSS

23.69% chance of exploitation in the next 30 days, 98th percentile

Published

2018-02-07

Updated

2024-08-05

Proof-of-concept exploits (1)

• kirillwow/ids_bypass121★ · 2019-01-11

ExploitDB entries (1)

• https://www.exploit-db.com/exploits/44247

Security advisories

• https://suricata-ids.org/2018/02/14/suricata-4-0-4-available
• OISF/suricata/pull/3202/commits/e1ef57c848bbe4e567d5d4b66d346a742e3f77a1
• https://lists.debian.org/debian-lts-announce/2018/12/msg00000.html
• https://redmine.openinfosecfoundation.org/issues/2427

References

• CVE Record
• NVD entry

Related

• CVE-2016-10728
• CVE-2018-14568