CVE-2018-6794

    Dashboard / Vulnerabilities / CVE-2018-6794

    CVE-2018-6794

    Published: 7 Feb 2018Last Modified: 8 Jul 2026

    Summary:

    Details: 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.

    References: https://lists.debian.org/debian-lts-announce/2018/12/msg00000.html, https://redmine.openinfosecfoundation.org/issues/2427, https://suricata-ids.org/2018/02/14/suricata-4-0-4-available/, https://github.com/OISF/suricata/pull/3202/commits/e1ef57c848bbe4e567d5d4b66d346a742e3f77a1, https://www.exploit-db.com/exploits/44247/

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -2eadd77e1036f5d6a99acc8e12c237b9cc7093be

    Affected versions

    suricata-4.0.3
    suricata-4.0.2
    suricata-4.0.1
    suricata-4.0.0
    suricata-4.0.0-rc2
    suricata-4.0.0-rc1
    suricata-4.0.0-beta1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High